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Irish Weather Statistics

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Comments

  • Registered Users Posts: 13,477 ✭✭✭✭sryanbruen


    Billcarson wrote: »
    Hi Sryanbruen the link won't work for me. What page is it on? Cheers.

    For me (using PC), it's on page 54 and it's dated 10 November.


  • Registered Users Posts: 1,485 ✭✭✭Billcarson


    sryanbruen wrote: »
    Billcarson wrote: »
    Hi Sryanbruen the link won't work for me. What page is it on? Cheers.

    For me (using PC), it's on page 54 and it's dated 10 November.

    Thanks see it now.


  • Registered Users Posts: 1,485 ✭✭✭Billcarson


    My memories of that spell was staying in my grandparents house in County Galway for few days around Xmas as we sometimes did. Think we came home ( living in Dublin at the time) around 1st or 2nd of jan it would have been. I remember there being not much snow on the ground in Galway. As we drove eastwards on the old Dublin- Galway road heading back home I remember the amount of lying snow increasing the further east we got. It was well into the night before we got home but the difference between the amount of snow in Galway compared to Dublin I have always remembered. That drive home has always stuck in my mind even though I was only 5.
    I do remember that being a snowy winter and I remember snow in March that yr and even some snow as late as may. Vague memories but memories all the same.


  • Registered Users Posts: 13,477 ✭✭✭✭sryanbruen


    Maximum temperatures for selected Irish stations on 2 March and 18 March 2018.

    ctvxG7R.png

    qDIhjm9.png


  • Registered Users Posts: 13,477 ✭✭✭✭sryanbruen


    After seeing the July 2018 data released publicly for Kilkenny (Greenshill), it seems that the station recorded 18 consecutive days of heatwave conditions (maximum of 25.0c or greater) from 24th June to 11th July. This is 4 days longer than the previous known longest heatwave (using the definition from Met Éireann) in Ireland which was 14 days in Birr during August 1976.

    Still waiting on August 2018 data though to do my Summer 2018 report.


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  • Registered Users Posts: 13,477 ✭✭✭✭sryanbruen


    January 1881 was a severely cold and snowy month in the UK & Ireland with some of the biggest snowfalls ever seen in England and the coldest temperatures over Ireland in history.

    The month had a CET of -1.5c making it the joint seventh coldest January on record since 1659 up to 2018. The period 8th to 27th January 1881 had a CET of -4.4c and it was -1.5c overall as a result of the relatively mild start and mild end especially the latter period. Winter 1880-81 had a mean temperature of around 2.8c at Phoenix Park, Dublin and this made it the sixth coldest Winter on record at the station; this was solely down to what happened in January as December 1880 had been relatively mild and February was only chilly rather than bitterly cold.

    Given what I've described so far, it would be a surprise to see that January 1881 started off relatively mild with a westerly flow in charge as high pressure sits to the south and low pressure to the north although the high pressure tended to be more influential blocking the lows crossing the country. It wasn't very mild by any means but this was some of the mildest weather the country had seen all month. Galway had a maximum of 10.0c on the 2nd. Other parts of Ireland and the UK had similar values during the period but somewhat lower although Londonderry had a maximum of 11.7c on the same day. It was damp and misty with this high pressure.

    archives-1881-1-2-12-0.png?

    High pressure began to intensify over us and retrogress to Greenland by the latter part of the first week of January. This resulted in conditions becoming gradually cooler. This high had fully retrogressed by the 11th with cold air flooding in from the northeast and troughs developing in the flow which meant the air was unstable resulting in snow showers beginning to occur. It was a very similar scenario to that of late November 2010. From this point up to the 16th to 19th, it just got colder and colder with the cold weather getting more severe.

    archives-1881-1-7-0-0.png?

    archives-1881-1-11-12-0.png?

    The northeasterly winds became very calm on the 16th resulting in frosts of unusual intensity with deep snow cover lying on the ground from near constant snow showers and continuous cold weather. Markree Castle, Co. Sligo got down to -19.1c on the morning of 16th January 1881 which is the lowest minimum temperature on record for any month in the Republic of Ireland to this day. Killaloe, Co. Clare recorded -13.9c. Phoenix Park had a maximum temperature of -3.1c on the 15th and -2.8c on the 16th (two of the 7 ice days that the station recorded during January 1881). Kelso, Scotland got down to -22.2c on this day whilst there was an observation of -24.4c on the same day at Blackadder, Scotland but the latter figure is disregarded from official records.

    archives-1881-1-16-12-0.png?

    Low pressure from the Atlantic pushed to the south of the UK and Ireland driven by the southerly tracking jet stream on the 17th/18th and developed into a Channel Low. This went on to become one of the worst blizzards that England had seen in history and perhaps even THE worst. The snowfalls started on the 17th in the southwest of England and at the same time, an easterly gale became evident with snow drifting in the wind as a consequence. This continued in some places for a good 48 hours.

    Meanwhile, the severe frosts continued further north over Ireland and Scotland including an observation of -30c at Blackadder (which again was disregarded due to possible non-standard exposure). Kelso recorded -26.7c on the 17th January 1881 which was the lowest temperature on record in the UK until February 1895 (which would later be equalled twice in January 1982 and December 1995).

    I'll let H. Sowerby Wallis, whom contributed to Symons' Meteorological Magazine, explain the situation with his in-depth article on the snowstorm of January 1881 in the February 1881 issue of the named magazine.
    After the 9th of January, snow fell daily on some portion of the British Isles and on the 12th and 13th rather heavily over the greater part of them, so that by the 17th (on which day practically none fell), there was a considerable depth on the ground over the whole of the United Kingdom, the weather having been so cold that scarcely any had melted. This depth averaged three to four inches over the greater part of England, and rather more in Wales, the N. of England and in Scotland. During the early morning of the 18th the wind, which was easterly, rapidly increased in force, and blew a strong easterly gale nearly all day, the wind falling again in the south at night, but in other parts of the country it lasted till about mid-day on the 19th. The gale was particularly severe on the east coast, but the number of wrecks and casualties all round our shores was very great; reports from many seaports stating that it was the most severe gale that had been experienced for more than 30 years. Much damage was done to roofs and a very large number of trees were blown down in the eastern counties - e.g. Lord Rendlesham reports over 1,500, most of them large ones, blown down in his estate and there were many isolated cases of structural damage in other parts of the country. In London an extremely high tide, increased by the gale, overflowed the low-lying districts on the south of the Thames, causing great distress, augmented by the extreme severity of the weather, among the poorer classes.

    The gale was accompanied by a heavy and steady fall of snow over all but the north of England, which lasted through the 18th and continued, though rather lighter, till about noon on the 19th. The amount of snow deposited over the whole of the southern portion of the country was very great, and was so drifted by the fierce wind, that communication both by rail and road was entirely disorganised, and it was more than a week before the railway and postal arrangements throughout the country recovered their usual regularity and punctuality ; the interruption to business was further increased by the large number of telegraph wires which were broken by the gale or by contraction caused by the extreme cold.

    Snow fell again on the 20th in the S. and S.W., very heavily in the Isle of Wight and neighbouring districts, blocking up many lines of railway that had with great difficulty been cleared from the fall of the 18th.

    Among careful observers in all parts of the country where the snow fell with its full intensity, it appears to be the general opinion that to find anything like a parallel case we must go back to 1836 or to 1814 ; and it would appear that in most parts of the country, the depth in those years was greater but that the drifts were not so great. As regards the fall in the Isle of Wight and South Hampshire, it is believed to be altogether unprecedented in recent times.

    One feature of the snow which appears to have been noticed nearly all over the country was its extreme fineness and dryness, and the remarkable manner in which it penetrated in large quantities through roofs, the cracks of doors and windows, and even the most minute and almost imperceptible crevices.

    The loss of life in England and Wales, entirely due to the snow, was very great and probably an estimate of 100 persons would be very near the truth, and the amount of distress occasioned simply by the stoppage of the supplies of food and fuel to country districts from towns is almost incalculable.

    Small birds died of starvation in vast numbers, their food being covered by the snow. At Littlehampton, in one shrubbery, more than 100 dead blackbirds and thrushes were found, and the following curious incident is reported in an Isle of Wight newspaper; "A friend of ours looking from his window (in Shanklin) on Monday, saw some larks hopping about on his lawn. Presently some rooks swooped down upon the birds, tore several to pieces, and ate them".

    It is very difficult to realise the magnitude of the snowstorm and of the drifts; perhaps some of the men employed in clearing the railways had the best opportunity of doing so. Locomotive engines and trains, in spite of their size and power, were snowed up by the dozen; not merely stopped, but buried for days together, and in some cases so completely as to be quite hidden. From the Tring cutting on the L. & N. W. railway, 1,700 truck loads of snow were taken. A railway truck is about 15 ft. long, therefore 1,700 trucks would form a train nearly five miles long. A train five miles long to empty one cutting on one railway, what length of train would it require to remove the snow from all the cuttings on all the railways in England?

    The loss to the country was enormous; over more than half England business was practically stopped for one day at least, and the cost of clearing not only the railways but almost all the roads in the country, is incalculable, not to mention the more or less serious suffering and discomfort. Plymouth was deprived of water for nearly a week. Public and private meetings of all kinds had to be postponed ; in short, that intercourse between man and man, on which the whole business and pleasure of life depend, was interrupted.

    There was also snow on the ground over almost the whole of Scotland and Ireland, which drifted considerably, and in some cases caused delay to traffic; but it has no interest in connection with the abnormally heavy fall of the 18th and 19th over the southern portion of England, and therefore needs no further notice.

    archives-1881-1-19-12-0.png?

    The severe frosts continued after the blizzard cleared to the east but the Atlantic broke through by the 27th with much milder conditions for the end of the month becoming established resulting in a huge thaw and flooding. Several stations recorded their monthly maximum temperatures during this period including Killaloe (on the 28th), Manchester and Barnstaple (both on the 31st), England with 11.1c.

    archives-1881-1-27-12-0.png?

    Minimum temperatures in the UK for selected dates (the Blackadder figures are now disregarded as already stated and many others here are too for the same reason; non-standard exposures) - thanks to Kevin Bradshaw for analysing these.

    13th: -18.9C at Cardigan
    14th: -20C at Corwen, -19.4C at Corwen, -18C at Achonachie, Alston, Ketton and Lauder
    16th: -24.4C at Blackadder. -23.3C at Stobo, -22.2C at Kelso and Corwen, -18.3C at Blackpool, -17.8C at Chester
    17th: -30C at Blackadder, -26.7C at Kelso, -26.1C at Stobo, -23.3C at Melrose
    18th: -26.1C at Stobo
    20th: -19.4C at Cheltenham
    21st: -23.3C at Haydon Bridge
    24th: -23.3C at Blackadder
    25th: -21.7C at Bury St Edmunds
    26th: -26.7C at Blackadder

    Meanwhile, here's the monthly minimum temperatures for several Irish stations taken from Symons' Meteorological Magazine.

    Station|County|Minimum temp.|Date
    Cork (Blackrock)|Cork|-13.3|15th
    Waterford|Waterford|-12.2|17th
    Killaloe|Clare|-13.9|16th
    Portarlington|Laois|-11.7|21st
    Monkstown|Dublin|-11.7|17th
    Galway|Galway|-10.6|17th


    Edenfel, Co. Tyrone got down to a minimum of -19.4c on the 23rd.

    Unfortunately, the only information that Met Éireann give in regards to the January 1881 snow in Ireland in their "Snowfall in Ireland" document is:
    The records at the Phoenix Park, Dublin recorded remarkable snowstorms in January
    (O’Reilly, 1981).

    It's no wonder why January 1881 was that cold going by its 500mb height anomaly reanalysis. Greenland blocking was very evident and the patterns were similar in ways to late 2010 but the below average heights were deeper in January 1881 and closer to us so there tended to be more moisture.

    LoSH0Mo.png

    Data comes from the UK Met Office.


  • Registered Users Posts: 13,477 ✭✭✭✭sryanbruen


    Some stats on December 2018's sunshine for the UK whilst I was doing my December 2018 review for the UK.

    Sunshine was very divided during December 2018 with eastern parts of the country tending to be on the sunnier side but the west was dull and in some parts, exceptionally so with less than half the normal amount of sunshine in an average December.

    With a total of 22.6 hrs, it was the third dullest December on record in Northern Ireland back to 1929 behind only 1931 (18.1 hrs) and 1977 (18.7 hrs). In contrast, eastern Scotland recorded a total of 45.7 hrs of sunshine during December 2018 making it the joint sixth sunniest on record in the region. In the southwest England/south Wales series, it was actually the dullest December on record back to 1929 with a total of only 22.7 hrs of sunshine which also made it the dullest month on record in these regions. January 1996 was the previous dullest month on record here with 25.6 hrs of sunshine.

    ANfsSpL.gif

    Data comes from the UK Met Office.


  • Registered Users Posts: 1,979 ✭✭✭Slashermcguirk


    This once again shows just how dry dublin is compared to other parts of the country. Casement less than 650mm of rain and Phoenix Park around 680mm. Would’ve to know how dublin rainfall compares to other European capitals, particularly western and Northern Europe.

    It’s amazing how it seems every single year without fail, dublin ends up the driest county in Ireland. I wonder what the reasons are for that?? Cork airport for example got nearly double the rainfall that dublin airport got. Amazing contrast in a country of our size.


    sryanbruen wrote: »
    Already have an article planned for both of the January 1974 storms :) .

    So despite all the very dry weather during the Summer and severe drought, 2018 ended unremarkable in terms of rainfall due to January, April, November and December mainly. Saying that, some stations did have quite a dry year and it was the driest year since 2010, 2013 or 2016.

    Ur6imR3.jpg

    Data comes from Met Éireann.


  • Registered Users Posts: 8,219 ✭✭✭Gaoth Laidir


    This once again shows just how dry dublin is compared to other parts of the country. Casement less than 650mm of rain and Phoenix Park around 680mm. Would’ve to know how dublin rainfall compares to other European capitals, particularly western and Northern Europe.

    It’s amazing how it seems every single year without fail, dublin ends up the driest county in Ireland. I wonder what the reasons are for that?? Cork airport for example got nearly double the rainfall that dublin airport got. Amazing contrast in a country of our size.

    It's down to the combination of its location in the extreme east of the country and in the rain shadow of the Wicklow mountains. So many days you see a clear radar over Dublin with winds with a southerly component.

    climate_rainfallmap.gif


  • Registered Users Posts: 1,979 ✭✭✭Slashermcguirk


    Thanks for that, makes sense. I always found it strange when two friends of mine from cork and Galway moved to dublin and they would frequently say how little it rains in dublin. While we hardly live in the costa del sol I think in dublin and that east we do take for granted how dry it is in comparison to other parts of the country. If you look at dublin average annual rainfall, that compares quite interestingly vs averages in other European cities in northern and Western Europe. Dublin is actually among the driest! 650mm in 2018 is very low compared to most of northern and Western Europe

    Dublin 732mm
    Copenhagen 1,100mm
    London 601mm
    Glasgow 1,079mm
    Berlin 591mm
    Cardiff 980mm
    Manchester 810mm
    Amsterdam 766mm
    Brussels 818mm









    quote="Gaoth Laidir;109045581"]It's down to the combination of its location in the extreme east of the country and in the rain shadow of the Wicklow mountains. So many days you see a clear radar over Dublin with winds with a southerly component.

    climate_rainfallmap.gif[/quote]


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  • Registered Users Posts: 13,477 ✭✭✭✭sryanbruen


    Annual weather summary for 2018 is out.

    Annual 2018 – Temperature and Sunshine above average in most places. Storm Emma brought widespread snow.

    The year began unsettled with a mainly westerly airflow for January with Storm Eleanor bringing strong winds on the 2nd. A cold and dry February finished with a polar continental air mass. This brought snow showers with significant accumulations in the East and South. Storm Emma at the beginning of March gave widespread snow in a cold and changeable month. The unsettled theme continued during April with temperatures near normal. May started changeable but overall it was a warm dry and sunny month with high pressure dominating. The settled conditions continued for most of June and July apart from Storm Hector in the middle of June, which brought wet and windy weather briefly. Heatwave and drought conditions in many places towards the end of June continued into early July in several places lasting longest in the South and East. Changeable weather returned towards the end of July and continued in the North and West for much of August. The South and East stayed predominantly warm and dry. September and October were cool and dry, however in September Storm Ali brought the strongest winds of the year on the 19th followed by Storm Bronagh, and Storm Callum on the 12th October. It was mild and unsettled for most of November with Storm Diana on the 28th. Atlantic westerlies dominated in December with Storm Deirdre on the 15th.

    https://cli.fusio.net/cli/bulletin/data/2018/17/sum_172018.pdf

    This was an unexpected record that I read about in the summary; it was Casement Aerodrome's sunniest year on record (monthly sunshine records back to 1964) with a sunshine total of 1576.8 hrs. I calculated the annual totals for myself to see what its previous record (and top 5) was. You can see the annual sunshine totals for every year from 1964 to 2018 below in the graph.

    Looks like it just barely bet the previous record of 2003.

    1. 2018 - 1576.8 hrs
    2. 2003 - 1572.3 hrs
    3. 2006 - 1549.4 hrs
    4. 2010 - 1545.0 hrs
    5. 1989 - 1530.1 hrs

    It also became only the seventh year to have an annual sunshine total of at least 1500 hours of sunshine since the records began at the station, with 1969, 1989, 1995, 2003, 2006 and 2010.

    QP1wGWg.png

    Data comes from Met Éireann.


  • Registered Users Posts: 13,477 ✭✭✭✭sryanbruen


    -10.5c is the minimum temperature in the UK for January 2019 (so far) which compared to Januaries since 2008 is among the highest but not THE highest as it equals that of 2012 but lower than 2014 and 2017. 2010 was the only one with a minimum below -15c and -20c.

    Been beavering away on trying to get a historical post done today, not sure if I'll post it today or tomorrow. It'll be on the January 1974 storms, as requested and planned.

    Q1vygnC.png

    Data from the UK Met Office.


  • Registered Users Posts: 13,477 ✭✭✭✭sryanbruen




  • Registered Users Posts: 6,834 ✭✭✭pauldry


    Hi Syran I know that this mild January ends midweek but what are the mildest Januarys ever. Its 8c average in Sligo up to 12th.


  • Registered Users Posts: 16,550 ✭✭✭✭nacho libre


    Janaury 1990 was very mild if memory serves me correctly


  • Registered Users Posts: 13,477 ✭✭✭✭sryanbruen


    pauldry wrote: »
    Hi Syran I know that this mild January ends midweek but what are the mildest Januarys ever. Its 8c average in Sligo up to 12th.

    Here are the mildest Januaries on record for selected Irish stations. I'd estimate that January 2002 is the mildest on record for Ireland. Each of the stations below have January 2002 as one of their top 5 mildest bar Dublin Airport, including the long-term station of Valentia Observatory which has records back to 1892 in its current location (although I have access only back to 1939).

    65itVlZ.png

    Data from Met Éireann.


  • Registered Users Posts: 13,477 ✭✭✭✭sryanbruen


    Lowest maximum temperature records for each day of Nov-Mar at Dublin Airport back to 1942. Can definitely make out the extreme cold spells like Nov/Dec 2010 and Feb/Mar 2018 here. Interesting how 28 Nov 2010 was the only November ice day in the record at the station. Also, 1/2 Mar 2018 were the only March ice days on record at the station.

    Still working hard on Artane2002's request as well as the January 1974 article. Hopefully I'll be able to finish the latter today. Had a very busy week.

    Jd7eZkK.png

    Data comes from Met Éireann.


  • Registered Users Posts: 13,477 ✭✭✭✭sryanbruen


    Looks like I did not get the article done, darn!

    Meanwhile,

    I think January 2019's CET will end up somewhere in the 4.0 to 4.7c range which is close to average pretty much against 1981-2010 (relatively mild for 1961-90).

    January 2019's CET provisionally stands at 5.1c up to the 20th.

    If we were to take this as the final figure hypothetically; For this Winter to be colder than average, February's CET would need to be:

    1.4c or lower (1981-2010)
    0.2c or lower (1961-90)

    So very unlikely that this will be a cold Winter if this were to be the final figure.

    To put this into perspective in terms of history (since 1659), February has had a CET at or below 1.4c in the following years {1947, 1895, 1855, 1740, 1986, 1684, 1963, 1956, 1692, 1942, 1765, 1785, 1838, 1929, 1695, 1697, 1698, 1853, 1827, 1795, 1845, 1917, 1663, 1665, 1670, 1691, 1969, 1755, 1955, 1979, 1746 and 1784}. This is a total of 33 years that this is happened.

    Meanwhile, in terms of 0.2c or lower, it has happened in the following years {1947, 1895, 1855, 1740, 1986, 1684, 1963, 1956, 1692, 1942} which is a total of only 10 years!

    February 2019 would have to be really exceptional as you can see to offset the otherwise mild Winter conditions.


  • Registered Users Posts: 13,477 ✭✭✭✭sryanbruen


    Up to January 20th, my closest official station (Dublin Airport) has recorded only 54.4 hrs of sunshine. This is a very low total. One positive that the northwesterly/northerly flows will bring to here is the increase in sunshine.

    1st Dec to 20th Jan sunshine totals of previous years at Dublin Airport.

    2017-18: 105.0 hrs
    2016-17: 96.5 hrs
    2015-16: 94.1 hrs
    2014-15: 138.0 hrs
    2013-14: 101.0 hrs
    2012-13: 94.3 hrs
    2011-12: 104.1 hrs
    2010-11: 121.9 hrs
    2009-10: 115.0 hrs

    Just puts into perspective how dull it has been here. Cork Airport would be similar I would have thought.

    Data comes from Met Éireann.


  • Registered Users Posts: 13,477 ✭✭✭✭sryanbruen


    This post will be on the infamous storms that hit Ireland in January 1974 with a brief summary on the month too. I was anticipating it to be a much longer post but Met Éireann have made an awesome in-depth PDF on the period so I thought I'd make mine shorter as I'd be copying and pasting a lot of their info in that. You can read the PDF here: https://www.met.ie/cms/assets/uploads/2017/08/Jan1974_Storm.pdf

    January 1974 overall was a very stormy, mild and wet month. It was the mildest January since 1949 for many though we've seen a good few milder Januaries since including 2002, 2012, 1989 and 2007. At the time, it was the mildest January on record at Shannon Airport since 1945 though January 1975 was relatively milder again.

    As mentioned, it was a very wet month. It was the wettest January on record (and still is) at Valentia Observatory with 318.6mm of rain - closest since has been January 2016 at 293.8mm. At Cork Airport, it was the wettest month on record (until December 2015) with 340.9mm of rain. In comparison to December 2015, the totals weren't as high but there was still as much as over 600mm of rain at stations in the Macgillycuddy's Reeks, Kerry.

    The month was most infamous for its highest frequency and severity of gale gusts. There was as much as 29 and 27 days with gale gusts at Malin Head and Roches Point respectively. These stations are exposed to gale gusts a lot of the time but are still high figures. Even stations like Dublin Airport and Kilkenny had 21 and 20 days with gale gusts respectively further revealing how stormy the month was.

    The first of the major storms occurred on 11th/12th January. This one like the other was associated with deep depressions sweeping northeastwards off the west coast up Ireland.

    archives-1974-1-12-0-0.png?

    16th January storm. Gusts were up to 71 knots (131 km/h) at Cork Airport and 74 knots (137 km/h) at Roches Point.

    archives-1974-1-16-12-0.png?

    27th/28th January storm. Pressure observations suggested this storm likely had a central pressure of 944mb as it passed to the northwest of Belmullet when it recorded 949mb.

    archives-1974-1-28-0-0.png?

    Maximum wind gusts for selected Irish stations on 11th and 12th January 1974 - thanks to Met Éireann for making this part relatively easy due to their tweet they put out.

    6PVv6RA.png

    tgL9zcE.png

    The Irish Times article on 15th January 1974.

    1puNclA.png


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  • Registered Users Posts: 13,477 ✭✭✭✭sryanbruen


    sryanbruen wrote: »
    November 1919 (99 years ago) recorded one of the most extraordinary cold spells in the history of the UK and Ireland. The fact the cold spell occurred in mid-November (not even the end of the month) says it all really. The November 1919 cold spell is my second favourite weather event to research or discuss about after November/December 2010 as I find it so fascinating how it could be as cold as it was then (Autumn 1919 in general was extremely intriguing, not November alone). Just goes to show how cold it can get in mid-November if the setup is there.

    The pattern of November 1919 was similar to that of November 2010. There was blocking over Greenland with anomalous below average heights to the southeast of the UK driving winds in from the northeast with air coming from Scandinavia. The 500mb height anomaly reanalysis of November 1919 below shows this.

    Some Irish Times articles on the cold/snow of November 1919.

    15th Nov 1919:

    lE6qyJh.png
    1nY1Duq.png
    tczJiI5.png

    17th Nov 1919:

    DdLYcsb.png
    bzznwR8.png
    ZAhC1Ut.png
    Nb4KjL6.png


  • Registered Users Posts: 13,477 ✭✭✭✭sryanbruen


    Now here's the low maximum temperature records for November to March at Cork Airport (1962 to 2018).

    I attached the Excel file and PNG of this (also Dublin Airport's as I forgot to attach in the previous post of that one).

    XjRRguj.png

    Data comes from Met Éireann.


  • Registered Users Posts: 13,477 ✭✭✭✭sryanbruen


    January 2019 has seen 5 air frosts up to the 26th at Dublin Airport. Here's how it compares with every other January's total air frosts back to 1942 at the station.

    5 air frosts is close to average for January here (1981-2010)

    Most: 2010 with 21
    Least: 1964, 1974, 1989 & 1990 with 0

    PvgfVl1.png

    Data comes from Met Éireann.

    January 2019 has been very dry for Ireland and I will be doing up a table of January 2019 totals up to the 26th along with the stations' record driest January.


  • Registered Users Posts: 13,477 ✭✭✭✭sryanbruen


    Whilst being a dull Winter so far with less than 90% of the average sunshine across Ireland, it has not been exceptional for Cork Airport (will discuss Dublin Airport in a second). Cork Airport has had two duller Dec/Jan combinations this decade (2011/12 and 2015/16) than 2018/19. 2018/19 has provisionally had 84.9 hrs of sun here.

    Two things that make it stand out at Cork Airport:

    - Extended period of 16 consecutive dull days (record long)
    - The trend has been for sunnier than average Dec/Jan periods in the 21st century so far with 2018/19 being an exception.

    PyrfpBE.png

    For Dublin Airport, this is provisionally its 4th dullest Dec/Jan combination on record back to 1941/42 with only 78.9 hrs of sunshine.

    Top 5 dullest:

    1. 1971/72 - 73.9 hrs
    2. 1995/96 - 74.2 hrs
    3. 1996/97 - 77.3 hrs
    4. 2018/19 - 78.9 hrs
    5. 1953/54 - 81.6 hrs

    2018/19 is an exception to the trend at Dublin Airport too with years tending to be sunnier than average. It was the first Dec/Jan combination here to fail to reach at least 100 hrs of sunshine since 1997/98.

    rLeafY6.png

    Data from Met Éireann.


  • Registered Users Posts: 13,477 ✭✭✭✭sryanbruen


    To start off hopefully a long month of articles (I've already informed that there would be a February 1969 article coming - I have a few more up my sleeve), it's the February 2009 cold and snowy spell.

    Overall, February 2009 wasn't a particularly cold month as the milder second half offset the cold nature of the first half. The CET was 4.1c which is close to average generally, a little bit milder than average against 1961-90. Must be noted too that this spell was more noted for its snowfalls rather than the depth of cold.

    At the very start of the month following a wet end to January for most especially in the south of Ireland, easterly winds became apparent from the get go. Conditions turned colder during the day with snow showers appearing down eastern coasts of the UK and wintry showers started to develop in the east of Ireland after dark.

    archives-2009-2-1-12-0.png?

    The easterly winds continued to feed in more and more snow showers on 2nd February 2009 with a more extensive band of snow developing in the cold flow pushing up from France into southeastern England through the day. The UK Met Office say:

    "Amongst the depths recorded at unofficial stations were 31 cm at Epsom (Surrey), 26 cm at Old Woking (Surrey), 13 cm at Blackheath (SE London) and 9 cm at Wokingham (Berks) (source uk.sci.weather newsgroup). In Wallington (Surrey), level depths of 24-27 cm were measured in various locations."

    This was London's greatest snowfall since February 1991.

    This area of snow was to push into eastern counties of Ireland by the latter part of the day bringing some heavy accumulations after many sleet and snow showers already here.

    archives-2009-2-2-12-0.png?

    archives-2009-2-2-0-1.png?

    Further wintry showers including sleet, snow and rain occurred on the 3rd with the extensive area of snow dissipating but only allowing showers to continue with the wind backing northerly.

    Over in the UK, snow depths from the area of snow pushing into Wales and northern England were 32cm at Malham Tarn, North Yorkshire and 30cm at Westgate, Northumberland.

    England saw its lowest temperatures of the spell with -9.6c at Odiham, Hampshire and -9.4c at Mickleham, Surrey.

    archives-2009-2-3-12-0.png?

    Showers on the 4th became more scattered and isolated but they returned to most places on the 5th though mainly in eastern and northern parts of Ireland with the wind veering to a northeasterly direction. Meanwhile, a new band of snow pushed into southern parts of the UK and resulted in widespread road, rail and air travel disruption. Two walkers died in the Lake District as a consequence of more snow showers in the north.

    archives-2009-2-5-12-0.png?

    A band of light snow pushed eastwards through Ireland into the west of the UK on the 8th. But otherwise, the period 6th to 12th February had scattered wintry showers here and there around the UK & Ireland with many frosty nights. Aviemore, Scotland got down to -18.4c which at this time was the lowest temperature in the UK since March 2001. The lowest that I know the Republic of Ireland recorded was -5.1c at Casement Aerodrome on the 6th. Katesbridge, Co. Down got down to -7.7c on the same day.

    archives-2009-2-8-12-0.png?

    After the 12th, conditions became gradually milder everywhere and it was pretty much a goodbye from Winter besides one little wintry outbreak around March 8th which was brief and temporary as Spring 2009 was very mild.

    I do not remember this period myself. I was 8 at the time and do remember a frosty spell of weather at the start of January following a dull and relatively mild Christmas staying over in my auntie's house but I just can't remember February 2009.

    Now time for some pictures:

    Easily the best shot I've seen taken during the spell in Ireland.

    https://twitter.com/PhotographyWx/status/1057703549268824064

    You can't forget this iconic shot from London on 2 February 2009.

    Tgulely.jpg



    This event was unusual at the time given the infrequency of widespread snow since the Barlett Winters of 1987-88 to 1989-90 began. However, it pales in comparison to previous Winters like 1946-47, 1962-63 or 1981-82.

    Data from Met Éireann and the UK Met Office.


  • Registered Users Posts: 13,477 ✭✭✭✭sryanbruen


    Time for a historical weather post and it's on February 1969 which is one that I promised to do.

    February 1969 was a very cold month, not quite on the level of the likes of February 1895, 1947, 1956, 1963 or 1986 but still exceptional enough with severe weather taking place. It had a CET of 1.0c making it the coldest since 1963 and it was dominated by frequent northerly or easterly winds.

    The month began with a northwesterly flow as low pressure attempted to sink southeastwards through the UK & Ireland and later turn the winds into the north.

    archives-1969-2-1-12-0.png?

    The northerly was quite potent with outbreaks of snow occurring for various places including in Dundalk for the League of Ireland match with Sligo Rovers.

    archives-1969-2-2-12-1.png?

    oFc5YBE.png
    hjRa8gQ.png

    High pressure ridged in for a couple of days following the northerly. After initial severe frost on the 3rd, it was relatively milder for a time on the 4th and 5th with the Atlantic toppling around the high pressure. However, this high would retrogress by the 6th into the Atlantic and up to Greenland forcing a cold front southwards from the north turning the winds back into a northerly. This was an extremely cold northerly wind and one that would be quite unbelievable today in particular.

    Daytime temperatures struggling around the freezing mark on the 7th with nightime temperatures dropping well below freezing.

    It was so cold that a polar low developed in the flow resulting in lots of heavy snowfalls as the Irish Times from 8 February 1969 says below.

    mcnzUqv.png

    Here's what happened in Britain according to Trevor Harley with this northerly:
    The low-level wind record of 118 kn (135.8mph) was set at Kirkwall on the 7th; this record stood until February 1986. Also on the 7th the maximum temperature at Eskdalemuir was -7C. A polar low caused a notable blizzard affected the east Midlands and South East on the same day as it introduced very cold arctic air. Snow started in the early afternoon, and finished 6 hours later, depositing a foot of snow; in Kent there were 30 cm, with some 20' drifts. As the polar air flooded south temperatures fell from 4C at midday, to -3C in the snow, to -14C as the snow cleared overnight.

    A historical day the 7th February 1969 was.

    archives-1969-2-7-12-0.png?

    archives-1969-2-7-12-1.png?

    archives-1969-2-8-12-1.png?

    Thawing occurred around the 10th as milder Atlantic air, though still on the cool side, infiltrated into Ireland via a westerly to northwesterly flow.

    archives-1969-2-10-12-0.png?

    The relatively milder conditions weren't going to last long as by the 13th, a northeasterly flow became established bringing more bitterly cold weather. Up to the end of the month then with the exception of the 22nd-24th when a thaw took place with the winds veering southerly for a time resulting in the mildest conditions all month for some including the monthly maximum high temperature for Ireland with 11.8c at Valentia Observatory on the 24th, the pattern just became blocked with varied northerlies and easterlies rather than one mean wind direction dominating throughout. The severest part of the spell was near the start.

    Through this period, there were very severe frosts including -20.8c at Grantown-on-Spey in Scotland on 18th February whilst Claremorris, Co. Mayo got down to -17.1c on 17th February 1969, the lowest for February in Ireland since 1895 and has not been beaten since. Remarkably, it also recorded -17.0c on 16th February and -10.6c on 15th February. Other very low values included -8.6c at Cork Airport and -7.3c at Valentia Observatory on the 17th.

    archives-1969-2-14-0-0.png?

    There was a snowstorm for southern parts of the UK and Ireland on 19th/20th February 1969 although this is not documented much.

    archives-1969-2-20-0-0.png?

    The final day of February 1969 still in an easterly flow.

    archives-1969-2-28-12-0.png?

    February 1969 monthly weather summary from the Irish Times.

    QpfAVn8.png

    Data comes from Met Éireann and the UK Met Office.

    Ireland and the UK weren't alone in the cold it seems.

    qWmN5hu.png
    hbWdsLl.png


  • Registered Users Posts: 1,976 ✭✭✭Artane2002


    Excellent work as always Sryan, I've been looking forward to this one. I knew it was exceptionally cold but wow, I didn't know the -18c isotherm got into northwest Scotland. I'd love a repeat of February 1969 but it's impossible to get this depth of cold from northerlies anymore. For me, these days northerlies are as useless as northwesterlies, the last good one was 2010. They are colder than northwesterlies but if we were to have cold without snow, I'd rather have high pressure over us.


  • Registered Users Posts: 6,834 ✭✭✭pauldry


    Any idea of the mildest winters sryan?

    This one must be right up there


  • Registered Users Posts: 13,477 ✭✭✭✭sryanbruen


    pauldry wrote: »
    Any idea of the mildest winters sryan?

    This one must be right up there

    Will take some time to analyse individual station data and as I'm currently doing my mock exams (finish this Thursday thankfully), I don't have a lot of time so hopefully will be able to work over mid-term for you but with multiple other projects on request in progress (including coilsaille's request back in September, Artane2002's request and Oneiric 3's request) too.

    Oneiric 3 may be able to post mildest Winters on record based on his IMT data series.

    If I were to estimate, I'd say the mildest Winters on record are 1997-98, 1988-89, 2011-12, 2015-16, 2016-17, 2001-02, 1974-75 and if we're going way back; 1942-43, 1934-35 and 1868-69.


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  • Registered Users Posts: 13,477 ✭✭✭✭sryanbruen


    More Irish Times articles from February 1969.

    10 February 1969:

    20hvc6z.png
    aobnPCA.png
    h7T5W57.png

    15 February 1969:

    dwI45qh.png
    m6fZd28.png
    4YSbYk9.png
    D2VXBZT.png


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