Advertisement
If you have a new account but are having problems posting or verifying your account, please email us on hello@boards.ie for help. Thanks :)
Hello all! Please ensure that you are posting a new thread or question in the appropriate forum. The Feedback forum is overwhelmed with questions that are having to be moved elsewhere. If you need help to verify your account contact hello@boards.ie
Hi all! We have been experiencing an issue on site where threads have been missing the latest postings. The platform host Vanilla are working on this issue. A workaround that has been used by some is to navigate back from 1 to 10+ pages to re-sync the thread and this will then show the latest posts. Thanks, Mike.
Hi there,
There is an issue with role permissions that is being worked on at the moment.
If you are having trouble with access or permissions on regional forums please post here to get access: https://www.boards.ie/discussion/2058365403/you-do-not-have-permission-for-that#latest

Irish Weather Statistics

1141517192023

Comments

  • Registered Users Posts: 603 ✭✭✭Captain Snow


    sryanbruen wrote: »
    Was going to leave the Winter 1978/79 historical post 'til a month later but I guess now is as good a time as any....

    [/I]

    I look forward to the Day you write your first book. :)


  • Registered Users, Registered Users 2 Posts: 13,666 ✭✭✭✭sryanbruen


    Artane2002 wrote: »
    Are there any interesting rainfall stats from November 2014? I remember some very wet days from back then.

    Personally loved November 2014 and remember it as vividly as I do with 2010. 11th November 2014 was my 14th birthday and it was lashing, very dark in fact.

    At the time up to the 14th and then the 21st again, I thought it was going to be a record breaking wet November. It didn't turn out that way and just ended up fairly unremarkable compared to say November 2009 (and 1965 too as shown above). Nevertheless, parts of Dublin had nearly double their average November rainfall.

    Here's a graph of daily rainfalls for multiple Dublin stations during November 2014:

    k8iHFSL.png

    The 13th was a particularly wet day. I remember a very thick outbreak of fog during the evening of the 20th.

    Data comes from Met Éireann.

    Some pictures from November 2014:

    Think this first pic is of Cork on the evening of 6th November 2014 (Cork Airport had a daily rainfall of 27.0mm on this day). Dublin wasn't the only place that was very wet in November 2014..... still pales in comparison to November 2009 though.

    R4oeAI7.jpg

    Taken on 7 November 2014, I forget where this was.

    eGyyRQ9.jpg

    Taken on 11 November 2014, I again forget where this one was at.

    J6cA9bx.jpg

    Young kids trying to get school in Cork on 13 November 2014.

    2nVooMg.jpg

    Flooding in Dublin on 14 November 2014.

    Gx0nwhR.jpg

    The fog of 20 November 2014 in Dublin.

    23C4H7P.jpg


  • Registered Users, Registered Users 2 Posts: 6,238 ✭✭✭Oneiric 3


    Once again, a terrific set of posts there Syran. Amazing amount of work - and well researched work that is done from the heart and not for any personal or monetary gain.

    Contrast this to the endless clickbaity headlines that we see on an almost daily basis by media outlets, written by soulless people who have absolutely no idea what they are talking about, yet still get to have biggest say in the public sphere, because it is profitable to them, their advertisers and their so-called companies.

    New Moon



  • Registered Users, Registered Users 2 Posts: 13,666 ✭✭✭✭sryanbruen


    Annual Ireland maximum and minimum temperatures for 1910-1940, using UK Met Office monthly weather reports.

    Maximum temperatures

    1910: 26.1c at Limerick (Mungret College), Birr Castle and Killarney on July 14th
    1911: 31.1c at Killarney on July 13th
    1912: 24.4c at Roches Point on July 15th/16th
    1913: 26.7c at Wexford on August 14th/Waterford Trg. Coll. on August 15th
    1914: 27.2c at Mountmellick on July 11th/Kilkenny on July 21st
    1915: 25.6c at Killarney on June 22nd
    1916: 29.4c at Killarney on August 6th
    1917: 26.1c at Glasnevin on July 13th
    1918: 28.9c at Killarney on June 1st/2nd
    1919: 27.2c at Carrick-on-Suir on August 14th
    1920: 25.0c at Birr Castle on May 25th
    1921: 32.2c at Killarney on July 12th
    1922: 27.8c at Killarney on May 30th/Foynes & Glasnevin on May 31st
    1923: 30.0c at Waterford (Gortmore) on July 12th
    1924: 23.9c at Dublin City on July 15th
    1925: 30.0c at Killarney on June 9th
    1926: 29.4c at Mountmellick, Kilkenny & Killarney on July 14th
    1927: 26.7c at Mountmellick on May 7th
    1928: 28.3c at Killarney on July 22nd
    1929: 27.2c at Kilkenny, Foynes and Mountmellick on July 14th (also July 15th at Foynes)
    1930: 27.2c at Newcastle on August 27th
    1931: 25.6c at Foynes on August 5th
    1932: 27.2c at Newcastle on July 9th
    1933: 30.0c at Kilkenny on July 4th
    1934: 32.2c at Foynes on July 9th
    1935: 27.2c at Newcastle on July 13th
    1936: 26.7c at Glasnevin & Hazelhatch on August 29th/Cork on August 31st
    1937: 27.8c at Hazelhatch on August 2nd
    1938: 25.6c at Birr Castle & Foynes on August 3rd
    1939: 28.9c at Carrick-on-Suir & Cork on June 6th
    1940: 28.9c at Glasnevin & Trinity College on August 9th/Birr Castle & Rathfarnham on June 8th

    Minimum temperatures

    1910: -13.9c at Markree Castle on January 7th
    1911: -10.6c at Markree Castle on February 1st
    1912: -11.7c at Limerick (Mungret College) on February 3rd
    1913: -10.0c at Clongowes Wood College on January 13th/14th
    1914: -10.0c at Markree Castle on December 24th
    1915: -9.4c at Phoenix Park on January 25th
    1916: -7.8c at Phoenix Park on December 27th/Markree Castle on March 4th/Cahir on December 16th & 17th
    1917: -15.0c at Clongowes Wood College on February 6th
    1918: -7.8c at Limerick (Mungret College) on January 9th
    1919: -11.1c at Markree Castle on November 14th
    1920: -8.9c at Cahir on December 16th
    1921: -6.7c at Baldonnel on March 7th
    1922: -6.1c at Phoenix Park on April 2nd
    1923: -8.3c at Kilkenny on November 25th
    1924: -7.8c at Markree Castle on January 11th
    1925: -8.9c at Markree Castle & Phoenix Park on December 23rd
    1926: -8.3c at Markree Castle on October 31st
    1927: -6.7c at Markree Castle on November 13th & 20th/Mountmellick on December 31st/Phoenix Park on February 13th
    1928: -10.0c at Mountmellick on March 13th/14th
    1929: -13.9c at Markree Castle on January 1st
    1930: -8.3c at Markree Castle on February 10th
    1931: -7.8c at Hazelhatch on March 10th
    1932: -7.8c at Markree Castle on February 19th
    1933: -7.8c at Kilkenny on January 26th
    1934: -6.7c at Birr Castle & Hazelhatch on February 27th
    1935: -11.1c at Markree Castle on December 23rd
    1936: -7.2c at Glasnevin & Phoenix Park on January 13th
    1937: -7.2c at Markree Castle on December 9th/Birr Castle on December 8th
    1938: -11.1c at Markree Castle on December 20th
    1939: -11.1c at Markree Castle on January 5th
    1940: -11.7c at Markree Castle & Glasnevin on January 17th (also January 18th at Glasnevin)


  • Registered Users Posts: 2,021 ✭✭✭Artane2002


    Summer 1924 sounds very grim with a max of not even 24c.


  • Registered Users, Registered Users 2 Posts: 13,666 ✭✭✭✭sryanbruen


    Artane2002 wrote: »
    Summer 1924 sounds very grim with a max of not even 24c.

    Here's what the 500mb height anomaly reanalysis looks like for Summer 1924 :pac:.

    8zXG4f9.png


  • Registered Users, Registered Users 2 Posts: 13,666 ✭✭✭✭sryanbruen


    Daily mean temperatures for Dublin Airport during selected Winters (November to March). Could not include 1955-56 and 1995-96 due to them being leap years.

    Look at November/December 2010 standing out against all the rest.....

    Wonder how the Summers would look in terms of daily mean temperatures. Any particular stations you guys would like me to take a look at and compare?

    xE6deca.png

    Data comes from Met Éireann.


  • Registered Users, Registered Users 2 Posts: 13,666 ✭✭✭✭sryanbruen


    Mid-November 1996 contained a cold spell that is rather forgotten as it wasn't too remarkable historically wise compared to let's say 1919, 1965 or 1993 for three examples (and later 2010 too). Nevertheless, the spell did provide some interest. It was frequented by northerly winds for most of the period (18th to 24th November 1996).

    The winds briefly turned westerly on the 18th as a deep depression of 965mb approached from the Atlantic into the southwest of Ireland and ran along the south of the country into the UK on the 19 November 1996. The depression struggled to push eastwards due to high pressure to the north and as a result slid to the southeast forcing northerly/northeasterly gales to occur. There was plenty of heavy rain over England, Wales and eastern parts of Ireland. Casement Aerodrome, Co. Dublin recorded a daily rainfall of 58.4mm on the 19th, its wettest November day on record until 5 November 2000.

    The north recorded very little rain on the 19th whilst uphill areas under the depression had heavy snow including Blessington in the Wicklow Mountains and the Welsh Mountains where depths reached between 5-12cm of snow. By the 21st, the Pennines in the north of England had a snow depth up to 26cm.

    The 18th and 20th-23rd were generally frosty and sunny with a lot of dry weather but some scattered wintry showers over various parts of the UK and a weak band of rain in the west of Ireland on the 21st. Minimum temperatures regularly got below freezing throughout the period including England, Wales and Ireland. The table below shows the daily temperature records in the UK for 18th-24th November 1996. Three consecutive nights where -10c was recorded somewhere in the UK and every night had a grass minimum at least -10c or lower somewhere in the UK.

    k2dvA9V.png

    Ireland's temperature records during the spell included an air minimum of -5.7c at Straide, Co. Mayo on the 21st, the lowest November temperature in Ireland since 1993 and a grass minimum of -12.3c at Kilkenny and Derrygreenagh on the same day, again the lowest for November in Ireland since 1993.

    Cork Airport had its lowest November grass minimum temperature on record on the 21st with -8.9c, as did Mullingar with -9.7c.

    You can see how the spell evolved with this GIF of reanalysis charts.

    tjt2ujU.gif

    Extract from Met Éireann's weather bulletin for November 1996.

    Obj8tHG.png

    This spell was a big contrast to how the month initially started including a maximum of 17.9c at Merrion Square, Co. Dublin on the 1st and 18.1c at Heathrow Airport on the 2nd.



    500mb height anomaly reanalysis for November 1996. It was a fairly cold, wet and sometimes stormy month overall but very sunny and the sunniest November since 1965 for many.

    g2FCk7M.png

    Youngsters in Colwyn Bay, Wales made the most of the unexpected blizzards in November 1996 (likely the 19th) which caused pupils to be sent home early from schools.

    TsYfhVt.jpg

    Data comes from the UK Met Office & Met Éireann.


  • Registered Users Posts: 2,021 ✭✭✭Artane2002


    Where can I access data for sunshine hours, maximum wind gusts and days with snowfall in 2018 for the following stations:

    Dublin Airport
    Belmullet
    Cork Airport
    Malin Head
    Ballyhaise


  • Advertisement
  • Registered Users Posts: 2,021 ✭✭✭Artane2002


    Artane2002 wrote: »
    Where can I access data for sunshine hours, maximum wind gusts and days with snowfall in 2018 for the following stations:

    Dublin Airport
    Belmullet
    Cork Airport
    Malin Head
    Ballyhaise

    Nevermind, found it on the MÉ website.


  • Registered Users, Registered Users 2 Posts: 13,666 ✭✭✭✭sryanbruen


    Artane2002 wrote: »
    Nevermind, found it on the MÉ website.

    I was planning on giving you a document of all the 2018 data to date on the sunshine hours this weekend. Although, that would take a lot of time going through individual daily data!

    Unfortunately, I do not know of any data on snowfall outside of the Snowfall in Ireland PDF they made.

    As for the maximum wind gusts, you use the historical database but keep in mind, they're in knots and you would need to convert online to km/h or mph if you wanted to use those measurements instead.


  • Registered Users, Registered Users 2 Posts: 13,666 ✭✭✭✭sryanbruen


    sryanbruen wrote: »
    Daily mean temperatures for Dublin Airport during selected Winters (November to March). Could not include 1955-56 and 1995-96 due to them being leap years.

    Look at November/December 2010 standing out against all the rest.....

    Wonder how the Summers would look in terms of daily mean temperatures. Any particular stations you guys would like me to take a look at and compare?

    Not many stand out in comparison to the Winter periods but mid-July 1983 certainly stands out for Dublin Airport.

    YK2dxdh.png

    Data comes from Met Éireann.


  • Registered Users Posts: 2,021 ✭✭✭Artane2002


    Sryan, have you done a full post on February 1969? I've seen you mentioning it a couple of times but I can't remember if you made a post about it. The northerly back then seemed very potent, bringing -10c uppers right down to Southern England with -15c uppers touching Scotland.


  • Registered Users, Registered Users 2 Posts: 13,666 ✭✭✭✭sryanbruen


    In November 1988 (30 years ago), cold weather set in due to high pressure bringing dry weather. Huge numbers of people in Dublin were lighting up fires using fossil fuels to heat their homes. This led to pollution and heavy smog was an all-time high for the area. At this time, Dublin was thought to be the most smoke-polluted city (or at least one of the most smoke-polluted cities) as Ireland did not adapt to changes which other countries set including Britain which released the Clean Air Act in 1956 to reduce air pollution in response to the Great Smog of December 1952. This smog was most persistent from the 23rd-26th in localised parts of Dublin although there was several instances of it during the month. The image below was Ballyfermot, Co. Dublin on 24th November 1988.

    NIg7rlz.jpg

    From an article in 2013 that this was posted in:
    This dense mixture of smoke and fog – by its very nature thick, polluting and bad for the lungs – had grown to become a huge issue in Dublin by the late 1980s.

    Thanks to bituminous (smoky) coal fires burning in the fair city, the resulting smoke and ashes had added up to become an inescapable problem, particularly on cold and windless nights when the smog became trapped under a blanket of warm air (known as a ‘thermal inversion’).

    The problem was so bad that in 1989, Deputy Ruairi Quinn spoke of his frustration at the situation, saying that “We have had promises for the future, we have heard all sorts of promises,” about what the Government would do about smog. He questioned who was benefitting from the sale of the coal, and accused the Minister of State with responsibility for environmental protection, Mary Harney, as being “totally negligent in the execution of her duties”, due to political and personal differences with the Minister for the Environment.

    She informed him that they were working towards a 1993 deadline, and that the Government was considering a number of options – and urged people who could afford low-smoke fuels to use them.

    This high pressure over top of the country produced severe frosts and freezing fog. Under fog, Clones, Co. Monaghan recorded a maximum of only 1.4c on 25th November 1988 which was well below the average for November at around 9c. Birr, Co. Offaly and Mullingar, Co. Westmeath recorded the lowest minimum temperature of the month of -6.9c on the 21st and 24th respectively. Even Valentia Observatory, Co. Kerry had a minimum of -4.0c on 22nd November, its lowest for November since 1919.

    Besides the smog and stubborn fog, November 1988 was a very nice month with well below average rainfall (including only 25% of average November rainfall at Casement Aerodrome, Co. Dublin and 57% of average November rainfall at Valentia Observatory) and sunny conditions (including 144% of average November sunshine at Casement Aerodrome) with the exception of Cork. Maximum temperatures weren't far from average but minimum temperatures were more than 1c below average for stations including Casement Aerodrome and Birr.

    BesMxSA.png

    RTÉ Archives has a news report on the smog of November 1988.

    https://www.rte.ie/archives/2018/1022/1005890-smog-in-dublin/

    Data comes from Met Éireann.


  • Registered Users, Registered Users 2 Posts: 13,666 ✭✭✭✭sryanbruen


    Artane2002 wrote: »
    Sryan, have you done a full post on February 1969? I've seen you mentioning it a couple of times but I can't remember if you made a post about it. The northerly back then seemed very potent, bringing -10c uppers right down to Southern England with -15c uppers touching Scotland.

    I have not done a post on February 1969 because I was saving it for its 50th anniversary in February 2019.


  • Advertisement
  • Registered Users, Registered Users 2 Posts: 13,666 ✭✭✭✭sryanbruen


    Even after all my years of studying weather history or stats, I only realise now that Winter 2009-10 was the joint coldest on record at Dublin Airport with 1962-63. Shocking to say the least as I didn't regard 2009-10 too highly in comparison to previous Winters of the past.

    jPAzTu0.png

    Data comes from Met Éireann.


  • Registered Users, Registered Users 2 Posts: 13,666 ✭✭✭✭sryanbruen




  • Registered Users, Registered Users 2 Posts: 13,666 ✭✭✭✭sryanbruen


    Just some fun stats for St. Andrew's Day (30 November) in Scotland.

    https://twitter.com/metoffice/status/1068522023972827140


  • Registered Users Posts: 2,021 ✭✭✭Artane2002


    Sryan I got a good question for you that you might like to answer when you get back from your holidays (hope you are enjoying it!)

    How unusual is it for October/early November to have the coldest weather of the autumn? This year should be one of those years.


  • Banned (with Prison Access) Posts: 3,288 ✭✭✭mickmackey1


    sryanbruen wrote: »
    Just some fun stats for St. Andrew's Day (30 November) in Scotland.

    https://twitter.com/metoffice/status/1068522023972827140


    All quite recent. Seems like Scottish weather is getting more extreme or else their records don't go back very far :p


  • Advertisement
  • Registered Users, Registered Users 2 Posts: 13,666 ✭✭✭✭sryanbruen


    All quite recent. Seems like Scottish weather is getting more extreme or else their records don't go back very far :p

    The records probably go back to the late 19th century. That 30th November air minimum in 1985 is an all-time record back to the mid-19th century for sure, I know that much.
    Artane2002 wrote: »
    Sryan I got a good question for you that you might like to answer when you get back from your holidays (hope you are enjoying it!)

    How unusual is it for October/early November to have the coldest weather of the autumn? This year should be one of those years.

    Thanks, not quite there yet though as I am off to the airport in the morning. Will answer that when I can after I get back too.


  • Banned (with Prison Access) Posts: 3,829 ✭✭✭Cork Boy 53


    Hi sryanbruen, hope you enjoyed your holiday break across the big pond. If you get a chance would you be able to put up some weather stats for December 1989?

    Thanks.


  • Registered Users, Registered Users 2 Posts: 13,666 ✭✭✭✭sryanbruen


    Artane2002 wrote: »
    Sryan I got a good question for you that you might like to answer when you get back from your holidays (hope you are enjoying it!)

    How unusual is it for October/early November to have the coldest weather of the autumn? This year should be one of those years.

    Meant to ask, are you enquiring for an in-depth answer with lots and lots of years of the past as examples, just more recent back to like the 1990s or generally speaking? If it's the former, that will take a lot of time as I'm sure you are aware.
    Hi sryanbruen, hope you enjoyed your holiday break across the big pond. If you get a chance would you be able to put up some weather stats for December 1989?

    Thanks.

    That will be no problem. December 1989 never gets a mention - I can't pretend like I mention it as I don't.

    Will be posting some November/December 2010 stats very very shortly as whilst working on my paper on said cold spells behind the scenes for the past month, I have come across some interesting stats that I've calculated.


  • Registered Users Posts: 2,021 ✭✭✭Artane2002


    sryanbruen wrote: »
    Meant to ask, are you enquiring for an in-depth answer with lots and lots of years of the past as examples, just more recent back to like the 1990s or generally speaking? If it's the former, that will take a lot of time as I'm sure you are aware.



    That will be no problem. December 1989 never gets a mention - I can't pretend like I mention it as I don't.

    Will be posting some November/December 2010 stats very very shortly as whilst working on my paper on said cold spells behind the scenes for the past month, I have come across some interesting stats that I've calculated.

    If you do have the time to do the former, then that would be interesting but I understand you have other things to do so no pressure :)


  • Registered Users, Registered Users 2 Posts: 13,666 ✭✭✭✭sryanbruen


    On the late 2010 stats,

    The synoptic station, Mt. Dillon in Co. Roscommon, recorded a total of 208 consecutive hours (which equals to 8.7 days) below freezing from 1400 GMT on the 17th December to 0500 GMT on 26th December. Think about that for a second, 8.7 days (including 8 full days) without touching or going above 0c. In a temperate climate like Ireland's, I think that's incredible. If I had to guesstimate, I would think the only month that could come close to such a stat like this is January 1881. Too bad there weren't many stations then.

    This remarkable Mt. Dillon stat is evident on the graph below which shows the hourly temperature observations for selected Irish stations (inc. Mt. Dillon) from 0000 GMT on 23 November to 2300 GMT on 26 December 2010.

    9IVLtqe.png

    Data comes from Met Éireann.


  • Registered Users Posts: 269 ✭✭Mount Vesuvius


    26/11/10 To 9/12/10
    Oak park and Mt.Dillon, 13 consecutive days not above 0°C looking at your graph?


  • Registered Users, Registered Users 2 Posts: 13,666 ✭✭✭✭sryanbruen


    Well it's the one year anniversary of a memorable day in many enthusiasts' (memorable to me for the wrong reasons!) lives and it would only be appropriate of course for me to do a post on not only the day but the cold spell which began on Thursday, December 7th.

    As Storm Caroline pushed eastwards across Scotland on December 7th 2017, the winds became a northwesterly and then a northerly on the western flank of the low. It was a relatively mild day for most as the cold air was sinking southwards from the north with a lot of cloud around at first and some rain. This cleared to sunny spells later with showers turning wintry over Scotland.

    CFSR_1_2017120712_1.png

    These northwesterly to northerly winds became ever more evident on the 8th with widespread wintry showers occurring over the UK and Ireland, most notably over Northern Ireland and the north of Scotland where they were very frequent and as a result, there were accumulations. Nowhere reached 10c with the maximum temperature out of both countries being 9.0c at Mullagh_Carrowlagan, Co. Clare. Over high ground in Scotland and northern England, temperatures failed to get above freezing all day including an observation of -2.0c at South Stainmore, Cumbria. Gale force winds made it feel much colder at times than what the actual temperature suggested. Otherwise, it was a nice bright day with plenty of sunshine.

    CFSR_1_2017120812_1.png

    The northerly flow got cut off on the 9th as the low pressure pushed further eastwards into Scandinavia. As a result, a more flat westerly airstream reached Ireland and the south of the UK which made it a milder day overall though the north was still cold with further wintry showers and icy conditions including a maximum of -0.9c at Malham Tarn, North Yorkshire and an air minimum of -7.3c at Bewcastle, Cumbria in the morning whilst Mullingar, Co. Westmeath had an air minimum of -2.6c. It was another dry, sunny day for the most part but much of Ireland and the southwest of England clouded over during the afternoon. This was as a result of an approaching slider low from the Atlantic which would bring rain at first to the west of Ireland and the southwest of England through the evening.

    As the low slid further down Ireland and the UK into the 10th and pushed a bit northeastwards, the rain turned to snow in the cold air. The snow became heavy with significant accumulations recorded over the Midlands of England and some parts of Ireland including an observation of 30cm at Sennybridge, Brecknockshire. Close to coasts, this was mainly cold rain. Scotland recorded further wintry showers and Dalwhinnie in the Highlands had an air minimum of -12.4c early on the 10th, the lowest December temperature in the UK since 2010. Keep in mind, December minimum temperatures haven't been low for a good number of years as the Decembers have tended to be very mild since 2010 for the most part - some have been rather average like 2012 and 2014. Mullingar recorded an air minimum of -3.9c meanwhile. Another ice day over parts of Scotland. More snow occurred over the Midlands of England during the evening.

    CFSR_1_2017121012_1.png

    The slider low cleared on the 11th leaving a bright but cold day across the UK and Ireland although there was some rain in the southeast of England which had pushed up from France during the morning. This would have brought some snow accumulations over the hills. Some wintry showers to the north once again. Dalwhinnie recorded an air minimum of -13.0c whilst Horseleap, Co. Offaly and Casement Aerodrome, Co. Dublin recorded an air minimum of -6.6c. Sennybridge's snow depth was still 31cm at 9am on the 11th. Another very cold morning on the 12th with an air minimum of -13.0c at Shawbury, Shropshire and -3.7c at Horseleap but this cold spell ended there as low pressure approached from the west during the morning.

    CFSR_1_2017121112_1.png

    Data comes from Met Éireann and the UK Met Office.

    Here's some pictures.

    Choulton, Shropshire. Credit: Jeremy Bolwell:

    kAoJ1vc.jpg

    Wolverhampton on 11 December:

    sGjzqVB.jpg

    Sally Gap, Co. Wicklow on 10 December. Credit: Skycam Ireland:

    XFdPTcg.jpg

    Threads on the event.

    9/10 December snow-ice warning & slider low ~ https://www.boards.ie/vbulletin/showthread.php?t=2057817783
    9/10 December slider low (Technical discussion) ~
    https://www.boards.ie/vbulletin/showthread.php?t=2057818137
    7/8 December snow-ice warning ~
    https://www.boards.ie/vbulletin/showthread.php?t=2057815705
    6-7 December Storm Caroline ~
    https://www.boards.ie/vbulletin/showthread.php?t=2057816982


  • Registered Users, Registered Users 2 Posts: 13,666 ✭✭✭✭sryanbruen


    26/11/10 To 9/12/10
    Oak park and Mt.Dillon, 13 consecutive days not above 0°C looking at your graph?

    Oak Park was above freezing on the 27th and 30th November. It had a run of 66 consecutive hours in between from 1600 GMT on the 27th to 0900 GMT on the 30th below freezing. It had another run of 68 consecutive hours below freezing from 1800 GMT on the 30th to 1300 GMT on the 3rd. It had yet again another run of below freezing temps of 67 consecutive hours from 1800 GMT on the 4th to 1200 GMT on the 7th. Whilst not a very long run of consecutive below freezing temperatures compared to the Mt. Dillon figure during the second cold spell, still remarkable stats nonetheless considering this is Ireland.

    Mt. Dillon had similar results.


  • Registered Users, Registered Users 2 Posts: 13,666 ✭✭✭✭sryanbruen




  • Banned (with Prison Access) Posts: 3,829 ✭✭✭Cork Boy 53


    Hi sryanbruen. Any news on the Dec 1989 stats I requested last weekend? Apologies if you have done this already and I have missed it.


  • Advertisement
  • Registered Users, Registered Users 2 Posts: 13,666 ✭✭✭✭sryanbruen


    Hi sryanbruen. Any news on the Dec 1989 stats I requested last weekend? Apologies if you have done this already and I have missed it.

    Sorry, I was primarily focusing on Artane2002's request first since it was the more in-depth one of the two but I guess it's no problem that I complete yours before continuing on with that.


  • Registered Users, Registered Users 2 Posts: 13,666 ✭✭✭✭sryanbruen


    December 2018 has been a wet month for some parts of Ireland particularly the southeast where up to the 13th have recorded more than 80% of their full December monthly average rainfall already. However, even in these places (bar Johnstown Castle), 1st-13th December 2015 was wetter.

    DpAn5zT.jpg

    Data comes from Met Éireann.


  • Registered Users, Registered Users 2 Posts: 13,666 ✭✭✭✭sryanbruen


    December 1989 was one of three colder than average Decembers in Ireland during the 1980s for most places although localised parts of the east and southeast had a fairly mild to close to average (but on the mild side) December - the 80s was known for mild Decembers. Compared to December 1981 which had been the coldest December of the 20th century, December 1989 was far less remarkable.

    For the CET, it was actually a relatively mild month with a mean temperature of 4.9c. So a bit of a strange month.

    December 1989 fell nearly in the middle of an infamous period of mild to very mild Winters following a period of cold/snowy Winters through the mid 1980s (from 1984-85 to 1986-87). It was the only "coldish" month in the period if that makes any sense. It could have been quite a cold month if the pattern wasn't so messy. The 500mb height anomaly reanalysis of the month below shows that the Azores High is displaced with the jet stream attempting to be on a southerly track. However, it gets stopped by high pressure over the med and central Europe which is not good for a cold pattern. The high pressure that was there over Greenland and Iceland tended to be very weak.

    9ntvP44.png

    In terms of 1951-80 averages, Belmullet had a temperature anomaly of -1.7c below average in December 1989 whilst Dublin Airport and Rosslare had temperature anomalies of +0.5c above average. The mean wind direction during the month was westerly in the south of the country due to the positioning of the jet stream whilst the north tended to have easterly winds which explained the temperature distribution.

    The first 10 days of December 1989 were very anticyclonic with plentiful high pressure but this led to frost and persistent fog for some. In urban areas like Dublin similar to November 1988, there was instances of smog. The monthly weather bulletin of December 1989 gives a good account on this smog incident (whilst I did a post on the November 1988 one). Birr got down to -7.0c on 1st December.

    NOAA_1_1989120612_1.png

    The weather turned more unsettled after the first 10 days with low pressure setting up shop to the south and east of Ireland whilst at the same time, an easterly flow developed to the north. These low pressure systems brought a lot of rain to the south of the country including to counties Kerry, Cork and Waterford. Cork Airport recorded 163.0mm (its entire monthly total for December 1989 was 239.0mm) alone between 11th-16th December 1989 including 34.4mm on the 11th, 48.4mm on the 13th and 51.3mm on the 16th. Such large totals in a short period of time of course resulted in severe flooding.

    The low that brought the heavy rain on the 16th December was very deep indeed, see the synoptic below for 0000 GMT on 17th December 1989. This storm bottomed out at a pressure of 941mb. Cork Airport bottomed out at 942.5mb, its record low pressure observation since its records began in 1962 and still is to this day.

    archives-1989-12-17-0-0.png?

    Another storm on 21st December brought 20-30m waves in the Bay of Biscay and these waves crashed against the La Jument lighthouse in France. The waves smashed through the lower windows of the lighthouse, ripped the front door, flooded the tower and washed away the furniture.

    archives-1989-12-21-12-0.png?

    Christmas Eve brought in another deep storm from the Atlantic though thankfully its centre was a distance away from making landfall on Ireland so was not a 16th/17th December scenario. Nevertheless, the winds still blew very hard with the windiest conditions of the month experienced including a 78 knot (144 km/h) gust at Belmullet. It became the mildest day of the month with long fetched southwesterly winds. Dublin Airport had a maximum temperature of 13.7c on the day.

    archives-1989-12-24-12-0.png?

    It gradually quietened down for the end of 1989 as a southeasterly airflow developed with the year concluding on a benign note.

    archives-1989-12-30-12-0.png?

    December 1989 got crazy wild very fast.


  • Banned (with Prison Access) Posts: 3,829 ✭✭✭Cork Boy 53


    Thanks for that sryanbruen. Yes that is how I remember that month way back then.


  • Registered Users, Registered Users 2 Posts: 1,577 ✭✭✭Billcarson


    Great post on Dec 89. I had forgotten about the frosty spell at the start of the month which was probably the coldest part of that winter. Living in Dublin at the time i remember the smog of early dec 89.


  • Registered Users Posts: 4,693 ✭✭✭SleetAndSnow


    Brilliant post sryan! Since I wasn't born when most of these events happened, I just find them so amazing to read and see what it was like before I actually existed :)


  • Registered Users, Registered Users 2 Posts: 13,666 ✭✭✭✭sryanbruen


    The pictures were actually taken in Ottawa, Canada. Unsure as to why the UK Met Office included them in a January 1996 freezing rain case study.

    https://twitter.com/snowwatchGB/status/1073928349158912000


  • Registered Users, Registered Users 2 Posts: 13,666 ✭✭✭✭sryanbruen


    I remember on this day 7 years ago, my school yard was like an ice rink during the morning hours. We did a bit of skating and it was gorgeously cold/sunny. It didn't last long but it was just one of those memorable mornings you can't forget.

    Ground temperatures were as low as -8.2c at Casement Aerodrome whilst the air minimum recorded on the day was -4.9c at Mullingar.

    Here's the chart for the 16 December 2011.

    nmySMHB.png

    Don't forget 16 December 2010 was the start of the second cold spell of late 2010 which would become one of the most severe cold spells ever recorded in the history of Ireland.

    archives-2010-12-16-12-0.png


  • Registered Users, Registered Users 2 Posts: 16,958 ✭✭✭✭nacho libre


    What a great night it was this time eight years ago. Hopefully we will see something like it in the new year. I hope some records will broken too, so you will have new stats to post about in here Sryan.


  • Advertisement
  • Registered Users, Registered Users 2 Posts: 13,666 ✭✭✭✭sryanbruen


    What a great night it was this time eight years ago. Hopefully we will see something like it in the new year. I hope some records will broken too, so you will have new stats to post about in here Sryan.

    That period was certainly a treat for record breaking.

    vnaeoRG.png


  • Registered Users, Registered Users 2 Posts: 16,958 ✭✭✭✭nacho libre


    sryanbruen wrote: »
    That period was certainly a treat for record breaking.

    vnaeoRG.png

    I remember me and my father were out filling turf one afternoon- think it was the 18th, we thought we'd never see such cold in Ireland, the temperature was a balmy -3. It will take something special to beat those records you posted about- but if we do get a visit from our siberian friend, early January is the ideal time for it to happen!


  • Registered Users Posts: 2,021 ✭✭✭Artane2002


    What a great night it was this time eight years ago. Hopefully we will see something like it in the new year. I hope some records will broken too, so you will have new stats to post about in here Sryan.

    I went on holidays two days later so I missed out on the fun :rolleyes:. Came back in January to find everything gone.


  • Registered Users, Registered Users 2 Posts: 13,666 ✭✭✭✭sryanbruen


    Artane2002 wrote: »
    I went on holidays two days later so I missed out on the fun :rolleyes:. Came back in January to find everything gone.

    Oh I would be so frustrated to miss out on it! January 2011 was nothing compared to what had occurred in the preceding two months but it was still a very nice month with decent severe frost and lovely crisp Winter sunshine. My favourite January actually.


  • Registered Users, Registered Users 2 Posts: 13,666 ✭✭✭✭sryanbruen


    Here's how Christmas Day has fared over the years at Dublin Airport.

    Wettest: 1956 with 28.9mm of rain
    Lowest max. temp: 2010 with -3.3c
    Highest max. temp: 1974 with 13.7c
    Lowest min. temp: 2010 with -12.2c
    Highest min. temp: 1988 with 10.8c

    Highest mean temp: 1988 with 11.9c
    Lowest mean temp: 2010 with -7.8c

    H2rtHmI.jpg

    Data comes from Met Éireann.

    I plan to do Cork Airport too.


  • Registered Users, Registered Users 2 Posts: 13,666 ✭✭✭✭sryanbruen


    sryanbruen wrote: »
    I plan to do Cork Airport too.

    As said above, I'd do Christmas Days at Cork Airport too. Here it is.

    Wettest: 2015 with 29.3mm of rain
    Lowest max. temp: 1962 with 0.7c
    Highest max. temp: 2011 with 12.0c
    Lowest min. temp: 1968 with -5.0c
    Highest min. temp: 1973 with 10.0c

    Lowest mean temp: 1962 with -2.0c
    Highest mean temp: 1988 with 10.8c (2011 was 10.7c)

    KKIWvtX.jpg

    Data comes from Met Éireann.

    Going to be a busy Christmas holidays for me as I have plenty of stats up my sleeve to do and some other projects behind the scenes.


  • Advertisement
  • Registered Users, Registered Users 2 Posts: 13,666 ✭✭✭✭sryanbruen


    Time to talk about the coldest December on record in the CET series back to 1659..... December 1890.

    December 1890 had a CET of -0.8c, this was only 0.1c colder than the second coldest December on record which was of course December 2010. Despite this, it was a far more unremarkable month in terms of the weather conditions and the actual temperatures outside of this CET. Before 2010, this was the most recent December to have a CET below zero.

    This cold December was the continuation of a notable November cold spell in 1890 too - just like 2010. Greenwich had recorded a minimum of -7.6c on 29th November 1890 whilst Addington in Buckinghamshire observed -21.1c on the same day though the latter figure is disregarded from official records. For Ireland, the lowest known temperature recorded was -8.9c at Markree Castle on the 28th. Killarney had an air minimum of -8.3c on both the 28th and 29th. There was occurrences of heavy snowfall during the spell especially in the southeast of England.

    archives-1890-11-27-12-0.png?

    The first day of the month doesn't look anything like what the CET would suggest. There is an organised Polar Vortex to the north of Europe with winds from a westerly direction over the UK and Ireland. What was a bit different with this chart was the low pressure over the Mediterranean especially Spain which disallowed the high pressure sinking southwards to here and the Atlantic to throw an onslaught at us.

    archives-1890-12-1-0-0.png?

    In fact, the weather became largely high pressure dominated directly after the first day. Here's the 500mb height synoptic for the 4th December 1890 for example with an easterly flow bringing cold air across both countries. Away from the north of Scotland and parts of the west of Ireland, it was just cold and very dull.

    archives-1890-12-4-12-0.png?

    archives-1890-12-4-12-1.png?

    Low pressure attempted to attack from the west at times, for instance on the 14th below. However, attempts tended to fail (with the exception of the 18th) as the high to the east squeezed out the low pressures or pushed them back into the Atlantic.

    archives-1890-12-14-0-0.png?

    The middle part of the month looked like it was going to pull in some very cold air from the east but it just about failed as the Atlantic attacked leaving the cold air just missing the eastern coast of the UK.

    archives-1890-12-16-12-0.png?

    archives-1890-12-19-0-0.png?

    Hereford in England got down to -14.4c on December 22nd whilst Kilkenny Castle got down to -7.8c on the 21st. Both of these temperatures were as a result of an area of high pressure. Around the same period December 21st to 23rd, a place called Stokesay (also in England) observed a minimum temperature of -17.2c.

    archives-1890-12-21-12-0.png?

    There was two attempts at quite a bitter easterly flow at the end of December which resulted in some light snow for parts but in general, it was just a very dry, anticyclonic, cold and dull month.

    archives-1890-12-27-12-1.png?

    archives-1890-12-30-12-0.png?

    archives-1890-12-30-12-1.png?

    In the easterly flows, the south and east of the UK were extremely gloomy. London had approximately a tenth of an hour's worth of sunshine all month during December 1890 easily making it the dullest month on record here. These dull conditions were also apparent in the east of Ireland with Dublin City having only 27.2 hours of sunshine during the month, just barely above Dublin Airport's record dullest December in 2002. Valentia Observatory at 44.1 hours of sunshine was actually relatively close to average whilst Stornoway in the northwest of Scotland had 50.2 hours of sunshine which is above its December average - remember that's a place where normally low pressure systems cross the majority of the time.

    It was a relatively dry month for pretty much everywhere with a Scandi High evident.

    ajPSJ3U.png

    Besides the very dull conditions and easterly flows, another reason why December 1890 could have been so cold was the polluted air blocking out the sun (also could be to blame for the very dull conditions especially in urban areas like London). This was more than 50 years before the Clean Air Act of 1956 was initiated in the UK.

    Due to the dry nature, it wasn't a snowy month at all despite the cold air being there.

    Data comes from the UK Met Office.


  • Registered Users, Registered Users 2 Posts: 13,666 ✭✭✭✭sryanbruen


    Now here's every Christmas Day's temperature and rainfall data at Shannon Airport from 1945 to 2017.

    Wettest: 1956 with 22.6mm of rain
    Lowest max. temp: 2010 with 0.0c
    Highest max. temp: 1955 with 13.8c
    Lowest min. temp: 2010 with -11.4c
    Highest min. temp: 2011 with 10.3c

    What a turnaround with the minimum temperatures from 2010 to 2011.

    Lowest mean temp: 2010 with -5.7c
    Highest mean temp: 2011 with 11.8c

    You couldn't find a more different pair of days as Christmas Day 2010 and 2011.

    q3KVjia.jpg

    Data comes from Met Éireann.


  • Registered Users, Registered Users 2 Posts: 7,174 ✭✭✭pauldry


    Cool Syran....again

    With the prospect of very mild weather for the rest of December this year must be high up in the mildest ones yet.

    Very little frost
    Lots of days the temp has maxed at 12 or 13c

    Christmas NIGHT now forecast to be 10c
    With the right conditions your 13.8c could be in danger

    Some outliers on the models have RED colours over Ireland for temperatures which potentially would mean 15c.

    Unreal


  • Registered Users, Registered Users 2 Posts: 7,174 ✭✭✭pauldry


    Actually 2015 seems to be the year

    That year it was slightly milder than this year so far but with mild weather until early January it will be close.

    IMT looks like it could be near 8c!


  • Registered Users, Registered Users 2 Posts: 13,666 ✭✭✭✭sryanbruen


    pauldry wrote: »
    Actually 2015 seems to be the year

    That year it was slightly milder than this year so far but with mild weather until early January it will be close.

    IMT looks like it could be near 8c!

    I'll give a list of the mildest Decembers for different Irish stations soon for interest.

    Casement Aerodrome, Co. Dublin has recorded only 17.5 hrs of sunshine during December 2018 up to the 21st.

    Top 5 dullest Decembers for the station

    1. 1971 - 27.1 hrs
    2. 1975 - 27.2 hrs
    3. 1977 - 29.2 hrs
    4. 2002 - 29.3 hrs
    5. 1996 - 29.4 hrs

    The top 3 dullest Decembers for Casement were recorded during the 70s. With the rest of December 2018 looking cloudy, perhaps a new dullest December record or in the top 10 somewhere?

    I'd wonder where Nov/Dec 2018 would fall in its top dullest November/December combinations. I'll find out tomorrow if I can.

    Data comes from Met Éireann.


  • Advertisement
Advertisement