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Irish Weather Statistics

sryanbruen

I've gathered Ireland's % of LTA rainfall for every month since March 2011 here in this graph below. Yes, they're not Grange's :P, they're Ireland's.

Since March 2011, there has been three months with 200% or more of the average rainfall, June 2012, February 2014 and December 2015.

There has been four months with 50% or less of the average rainfall, March 2011, March 2012, September 2014 and October 2016.

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sryanbruen

Here is the Irish Mean Temperatures (IMT) for January 1987-December 1994 in comparison with their 1981-2010 IMT average. It's getting harder and harder to make these as I go back further as you might have guessed 'cause I haven't posted here since last Saturday. It's getting harder due to the information being more scarce as you go back further.

Information gathered from Met Éireann for the Republic of Ireland and the Met Office for Northern Ireland.

infogiver

Hi I wonder if it's ok to butt in and ask a question?
I'm trying to find out what the weather was like in Ireland for Easter 1984?
It was April 22.
Thank you.

sryanbruen

infogiver wrote: »

Hi I wonder if it's ok to butt in and ask a question?
I'm trying to find out what the weather was like in Ireland for Easter 1984?
It was April 22.
Thank you.

Hey it's perfectly fine. Don't be afraid to ask questions people!

A ridge of high pressure first centred to the west of Scotland and later drifting over the North Sea dominated our weather from the 22nd to the end of the month. As a result, an easterly airflow developed during this fine spell which was unusually warm for April. Glenties, Co. Donegal recorded a mean daily maximum temperature of 20.4c from the 21st-30th! Many other places recorded mean daily maximum temperatures between 17-19c during the same period, one of the warmest periods on record for April. Thursday, April 26th 1984 currently holds the April maximum temperature record for Ireland of 25.8c at Glenties. Easter Sunday itself was just the start of the very warm spell so temperatures weren't remarkably high but it was still a very warm Easter with maximum temperatures between 16-21c. Sunshine was very abundant with many, many places recording between 10-13 hours of sunshine. It was what I like to call the Perfect Easter.

Information gathered from Met Éireann.

infogiver

sryanbruen wrote: »

Hey it's perfectly fine. Don't be afraid to ask questions people!

A ridge of high pressure first centred to the west of Scotland and later drifting over the North Sea dominated our weather from the 22nd to the end of the month. As a result, an easterly airflow developed during this fine spell which was unusually warm for April. Glenties, Co. Donegal recorded a mean daily maximum temperature of 20.4c from the 21st-30th! Many other places recorded mean daily maximum temperatures between 17-19c during the same period, one of the warmest periods on record for April. Thursday, April 26th 1984 currently holds the April maximum temperature record for Ireland of 25.8c at Glenties. Easter Sunday itself was just the start of the very warm spell so temperatures weren't remarkably high but it was still a very warm Easter with maximum temperatures between 16-21c. Sunshine was very abundant with many, many places recording between 10-13 hours of sunshine. It was what I like to call the Perfect Easter.

Information gathered from Met Éireann.

Thanks for that!

sryanbruen

Here is Ireland's maximum temperatures for each month from January 2003 to April 2017

Information gathered from Met Éireann

sryanbruen

With a provisional IMT of 8.6c (this is of subject to change), April 2017 was +0.1c above the average.

Sourced from Met Éireann for the Republic of Ireland and Met Office for Northern Ireland.

sryanbruen

sryanbruen wrote: »

With a provisional IMT of 8.6c (this is of subject to change), April 2017 was +0.1c above the average.

Sourced from Met Éireann for the Republic of Ireland and Met Office for Northern Ireland.

Correction, the IMT for April 2017 was actually 8.8c (+0.3c above the average).

Sourced from Met Éireann for the Republic of Ireland and Met Office for Northern Ireland.

sryanbruen

You guys might have been saying, what have I been doing because I have not posted in this thread for a week and 2 days. Well I've been yet again tediously calculating the IMT for more months and now all the way back to 1975! I thought why not have the IMT like the CET where you'd have a table like this one in the image where you can see all the IMTs clearly for every year and so I did. This image is the IMT for every month from January 1975-April 2017. I will continue to calculating the IMT for months before. Hope this is of use to anybody or at least enjoyable to look at 'cause it was very difficult to make.

sryanbruen

Just a fascinating fact I thought I'd share here:

The highest temperature of a month has been recorded in Ireland than the UK in only the following months in recorded history: June 1887, June 1940, October 1974, April 1975, December 2013 & June 2014. The only YEAR where Ireland had a higher temperature than the UK was 1887.

EDIT: This list is NOT complete so feel free to share months that Ireland had a higher maximum temperature than the UK in. And remember to give proof when you do so please.

Thanks to for contribution: axe2grind

axe2grind

sryanbruen wrote: »

The highest temperature of a month has been recorded in Ireland than the UK in only the following months in recorded history: June 1887, June 1940, October 1974, April 1975 & June 2014.

There'll be plenty of winter months with higher max in Ireland. Dec 2013 an example.
16.6 in UK
http://www.metoffice.gov.uk/climate/uk/summaries/2013/december
16.8 in Ireland
http://www.met.ie/climate/MonthlyWeather/clim-2013-Dec.pdf

sryanbruen

axe2grind wrote: »

There'll be plenty of winter months with higher max in Ireland. Dec 2013 an example.
16.6 in UK
http://www.metoffice.gov.uk/climate/uk/summaries/2013/december
16.8 in Ireland
http://www.met.ie/climate/MonthlyWeather/clim-2013-Dec.pdf

Well thanks for that. I really should have stated that the list I just named needs to be completed. Edited now with that and December 2013. Again thank you.

sryanbruen

Table of Irish stations' statistics will be posted soon for the period May 2017 1st-16th BUT the bad news is that after this, I don't think I'll be able to do this again due to timing issues

.

EDIT: Looks like I'm getting pushed back even more. Very sorry guys that this has turned out to be a disaster. I am annoyed as much as you who have expecting this table since I announced it.

sryanbruen

The IMTs for January 1972-December 1974 are now included here.

sryanbruen

Some Irish stations' mean temperatures for months in their records can be found here:

https://data.giss.nasa.gov/cgi-bin/gistemp/find_station.cgi?dt=1&ds=14&name=&world_map.x=352&world_map.y=97

These have been controversial to some people BUT in my opinion, they're ok. They also make my IMT calculating that bit easier compared to using Met Éireann's Historical Data.

sryanbruen

Provisional IMT for May 2017 is currently 12.9c.

sryanbruen

sryanbruen wrote: »

Provisional IMT for May 2017 is currently 12.9c.

Confirmed at 12.9c.

sryanbruen

Is there anything you want me to research, calculate etc in terms of Irish weather statistics out of your interest? Just curiosity as it's more useful to post stuff you would be interested in reading here than me posting useless, boring rubbish.

sryanbruen

To reply to MT's comment on saying June is not often the warmest month of the year. No it isn't. The average IMT for June is only 13.7c compared to 15.4c in both July and August. So far in the IMT records I have calculated back to January 1971, June has never been the warmest month of the year in Ireland. Although, 1988 was a close contender for doing so:

May: 11.4c
June: 14.6c
July: 13.5c
August: 14.8c
September: 12.6c

sryanbruen

Augusts from 1995-2005 vs 2006-2016

I have taken the liberty into calculating some figures for the Augusts of both of these periods to see if there is any great differences between them because just from thinking about them, I could swear that the quality in August's weather has gone down since August 2005 yet from 1995-2005, there was quite a long run of good Augusts. These are the IMTs for both period:

August 1995-2005: 16.4c
August 2006-2016: 15.0c

There is a very large range of 1.4c between the two. I was expecting a somewhat large range between the two and is shocking to see this very large difference. My and everybody else's theory in that the quality in August's weather has gone down since August 2005 is indeed correct, unless you like cold Summer months. 2006-2016 had some very notable cold Augusts including 2011, 2014 and 2015 - which all had an IMT of less than 14.0c (more than -1.4c below the average). What's shocking is that NO August since 2004 has had an IMT of 16.0c (+0.6c or more above average) or more. Meanwhile, August 1995, 1997, 2000, 2003 and 2004 all had an IMT of 16.0c or more.

No period is perfect though 'cause 1995-2005 still had its poor Augusts though on a much lower scale compared to 2006-2016. 1997 was an extremely wet August with rainfall records being set in much of the south during the month. Cork Airport had a daily rainfall of 87.1mm on August 3rd 1997 which made it the station's wettest day on record. Over 100-250mm of rainfall was widely recorded between August 3rd-6th 1997 over the southern half of Ireland. However, unlike wet Augusts such as 2008 (maximum temperatures were well below average but minimum temperatures were above average), 2014 or 2015, 1997 was also very warm. It was one of Ireland's warmest Augusts on record although still not nearly as warm as 1995.

I am currently in the works of calculating the IMTs for pre-January 1971 as well as working on a new thing called the IMRP (Irish Mean Rainfall Percentage) to show how wet was in Ireland in comparison with the average.

Data calculated from Met Éireann's historical data for the Republic of Ireland and Met Office for Northern Ireland

Billcarson

sryanbruen wrote: »

Is there anything you want me to research, calculate etc in terms of Irish weather statistics out of your interest? Just curiosity as it's more useful to post stuff you would be interested in reading here than me posting useless, boring rubbish.

If possible ,any correlation with above average septembers say the last 20 yrs or so being followed by a mild winter.

sryanbruen

Billcarson wrote: »

If possible ,any correlation with above average septembers say the last 20 yrs or so being followed by a mild winter.

These are all the above average temperature Septembers in Ireland since 1996 (20 years ago) using the IMT (an above average temperature September to be considered here has to have a deviation of at least +0.5c above the average, +0.1 to +0.4c are considered close to average): 1996, 1997, 1998, 1999, 2000, 2003, 2004, 2005, 2006, 2010, 2011, 2013, 2014 & 2016.

Only 3 out of the 14 Winters that succeeded warm Septembers since 1996 came out colder than average, 2000/01, 2010/11 and 2014/15. This shows that there is a 79% chance for a mild Winter to succeed a warm September using the IMT over the last twenty years. Meanwhile, this shows that there is a 21% chance for a cold Winter to succeed a warm September using the IMT over the last twenty years.

Winter 2014/15 is an interesting one in the package because even though it was a cold Winter like 2000/01 and 2010/11, it did not have a negative NAO or AO. It had a positive NAO and AO. Winter 2014/15 was a classic, zonal cold Winter. December 2000 had a similar situation in that it was very zonal and stormy but it was a cold month. The airstream would normally come from a polar maritime source, aka a northwesterly direction which made the Winter cold despite being zonal and having a positive NAO/AO. The below reanalysis from NOAA shows the pressure setup for Winter 2014/15.

Overall, a warm September has definitely "some" correlation to mild Winters in the last 20 years due to the very low chance of cold Winters following them in the last 20 years. However, this data only goes back to 1996 so does not take into account other warm Septembers and the Winters that followed them pre-1996 thus why this can be very controversial but I hope I have answered your question with my analogues above and the reanalysis from NOAA on Winter 2014/15.

Data from Met Éireann's historical data for the Republic of Ireland and the Met Office for Northern Ireland.

Billcarson

Thank you syranbruen,great work . That confirms what I thought about recent yrs and warm septembers being followed by mild winters. Perhaps something one should consider when doing a winter forecast if the september has been a warm one and perhaps worthy of mention when we get to sept this yr.

Yourself isit

syranbruen - what's the rainfall total in north Dublin (where you are or north county) for the last few years?

sryanbruen

Yourself isit wrote: »

syranbruen - what's the rainfall total in north Dublin (where you are or north county) for the last few years?

These are my rainfall totals (rounded to the nearest full mm) going back to 2012

2012: 961mm
2013: 639mm
2014: 865mm
2015: 897mm
2016: 718mm

Average (1986-2016): 704mm

Yourself isit

sryanbruen wrote: »

These are my rainfall totals (rounded to the nearest full mm) going back to 2012

2012: 961mm
2013: 639mm
2014: 865mm
2015: 897mm
2016: 718mm

Average (1986-2016): 704mm

It's been wet, huh?

This year must be lower.

sryanbruen

Yourself isit wrote: »

It's been wet, huh?

This year must be lower.

2014 and 2015 were some of Ireland's wettest years on record though it was mostly down to the extremely wet winters of both years.

2017 yes has been drier generally in spite of a rather wet (here, but it was mostly average to dry across Ireland) February and March (March was a very wet month across Ireland).

sryanbruen

These are Ireland's maximum temperatures for every year since 1988

2016: 30.4c at Mount Dillon on July 19th
2015: 26.1c at Glasnevin on June 30th
2014: 28.8c at Durrow on July 25th
2013: 31.0c at Dooks on July 19th
2012: 28.3c at Ardfert on May 25th
2011: 26.0c at Cavan & Athy on June 3rd
2010: 26.8c at Ardfert on May 23rd
2009: 28.6c at Galway on June 2nd
2008: 25.2c at Shannon Airport on July 24th
2007: 26.9c at Ballyshannon on June 9th
2006: 32.3c at Elphin on July 19th
2005: 30.3c at Kildalton on July 12th
2004: 27.3c at Birr on August 1st
2003: 30.3c at Belderrig on August 8th
2002: 25.6c at Clones on August 5th
2001: 28.4c at Ardee on July 28th
2000: 28.1c at Ballygar on June 18th
1999: 27.4c at Kilkenny on July 31st
1998: 25.4c at Belmullet on September 21st
1997: 28.4c at Ardfert on May 31st
1996: 27.0c at Shannon Airport on June 16th
1995: 30.8c at Kilkenny on August 2nd
1994: 25.1c at Casement Aerodrome on July 23rd
1993: 25.0c at Cathaleen's Fall on June 28th
1992: 25.6c at Birr on June 29th
1991: 28.4c at Cahirciveen on September 5th
1990: 29.5c at Casement Aerodrome on August 3rd
1989: 30.0c at Shannon Airport on July 18th
1988: 25.1c at Birr on June 14th

Information from Met Éireann's weather summaries and bulletins.

sryanbruen

This chart of decadal IMTs since the 1970s (2010s being up to 2016) shows that the 2010s has been the coolest decade since the 1980s. Quite a large drop from 10.3c in the 2000s to 9.7c in the 2010s so far. Only 2011 and 2014 in the 2010s have recorded an annual IMT of 10.0c or more so far.

Oneiric 3

sryanbruen wrote: »

Confirmed at 12.9c.

I have it down as 12.2c Syran?

sryanbruen

Oneiric 3 wrote: »

I have it down as 12.2c Syran?

You only include a certain number of stations when calculating the IMT don't you Patrick?