Climate Trends in Ireland
Climate trends for Ireland from 2 stations with long records. Also warmest years, rain, streaks and temperature swings.
Data as of . Last revised (2026-10-13).
Key Facts
- Of 5 stations in Ireland with at least 50 complete years of record, 2 had 2025 as their warmest year.
Warmest Years
Ireland, 5 stations| Year | Stations with this as their warmest year |
|---|---|
| 1893 | 0 |
| 1894 | 0 |
| 1895 | 0 |
| 1896 | 0 |
| 1897 | 0 |
| 1898 | 0 |
| 1899 | 0 |
| 1900 | 0 |
| 1901 | 0 |
| 1902 | 0 |
| 1903 | 0 |
| 1904 | 0 |
| 1905 | 0 |
| 1906 | 0 |
| 1907 | 0 |
| 1908 | 0 |
| 1909 | 0 |
| 1910 | 0 |
| 1911 | 0 |
| 1912 | 0 |
| 1913 | 0 |
| 1914 | 0 |
| 1915 | 0 |
| 1916 | 0 |
| 1917 | 0 |
| 1918 | 0 |
| 1919 | 0 |
| 1920 | 0 |
| 1921 | 0 |
| 1922 | 0 |
| 1923 | 0 |
| 1924 | 0 |
| 1925 | 0 |
| 1926 | 0 |
| 1927 | 0 |
| 1928 | 0 |
| 1929 | 0 |
| 1930 | 0 |
| 1931 | 0 |
| 1932 | 0 |
| 1933 | 0 |
| 1934 | 0 |
| 1935 | 0 |
| 1936 | 0 |
| 1937 | 0 |
| 1938 | 0 |
| 1939 | 0 |
| 1940 | 0 |
| 1941 | 0 |
| 1942 | 0 |
| 1943 | 0 |
| 1944 | 0 |
| 1945 | 0 |
| 1946 | 0 |
| 1947 | 0 |
| 1948 | 0 |
| 1949 | 0 |
| 1950 | 0 |
| 1951 | 0 |
| 1952 | 0 |
| 1953 | 0 |
| 1954 | 0 |
| 1955 | 0 |
| 1956 | 0 |
| 1957 | 0 |
| 1958 | 0 |
| 1959 | 0 |
| 1960 | 0 |
| 1961 | 0 |
| 1962 | 0 |
| 1963 | 0 |
| 1964 | 0 |
| 1965 | 0 |
| 1966 | 0 |
| 1967 | 0 |
| 1968 | 0 |
| 1969 | 0 |
| 1970 | 0 |
| 1971 | 0 |
| 1972 | 0 |
| 1973 | 0 |
| 1974 | 0 |
| 1975 | 0 |
| 1976 | 0 |
| 1977 | 0 |
| 1978 | 0 |
| 1979 | 0 |
| 1980 | 0 |
| 1981 | 0 |
| 1982 | 0 |
| 1983 | 0 |
| 1984 | 0 |
| 1985 | 0 |
| 1986 | 0 |
| 1987 | 0 |
| 1988 | 0 |
| 1989 | 0 |
| 1990 | 0 |
| 1991 | 0 |
| 1992 | 0 |
| 1993 | 0 |
| 1994 | 0 |
| 1995 | 1 |
| 1996 | 0 |
| 1997 | 0 |
| 1998 | 0 |
| 1999 | 0 |
| 2000 | 0 |
| 2001 | 0 |
| 2002 | 0 |
| 2003 | 0 |
| 2004 | 0 |
| 2005 | 0 |
| 2006 | 0 |
| 2007 | 1 |
| 2008 | 0 |
| 2009 | 0 |
| 2010 | 0 |
| 2011 | 0 |
| 2012 | 0 |
| 2013 | 0 |
| 2014 | 0 |
| 2015 | 0 |
| 2016 | 0 |
| 2017 | 0 |
| 2018 | 0 |
| 2019 | 0 |
| 2020 | 0 |
| 2021 | 0 |
| 2022 | 0 |
| 2023 | 1 |
| 2024 | 0 |
| 2025 | 2 |
Of the 5 stations in Ireland with at least 50 complete years of record, 2 (40.0%) had 2025 as their warmest year on record.
The years that were the warmest on record at the most stations are 2025 (2 stations), 2023 (1 station), 2007 (1 station) and 1995 (1 station).
3 of the 5 stations (60.0%) had their warmest year in the 2020s. That decade is not over.
By decade
| Decade | Stations with their warmest year in it | Share of stations | Stations with one of their five warmest years in it |
|---|---|---|---|
| 1890s | 0 | 0.0% | 1 |
| 1900s | 0 | 0.0% | 0 |
| 1910s | 0 | 0.0% | 0 |
| 1920s | 0 | 0.0% | 0 |
| 1930s | 0 | 0.0% | 0 |
| 1940s | 0 | 0.0% | 1 |
| 1950s | 0 | 0.0% | 0 |
| 1960s | 0 | 0.0% | 0 |
| 1970s | 0 | 0.0% | 0 |
| 1980s | 0 | 0.0% | 0 |
| 1990s | 1 | 20.0% | 7 |
| 2000s | 1 | 20.0% | 6 |
| 2010s | 0 | 0.0% | 1 |
| 2020s (to date) | 3 | 60.0% | 9 |
The set is the 5 stations with at least 50 complete years (all twelve months with 20 or more days of maximum and minimum). A station's warmest year is the one with the highest annual mean temperature, a tie going to the later year. The count describes these stations, not the whole area.
Heavy Rain and Dry Spells by Decade: Ireland
5 stations in the annual rain series- In Ireland, annual rain at 5 stations is shown as a percent difference from each station's own 1961-1990 mean, for 68 years from 1951 to 2025.
- The trend in annual rain is +2.1 percent per decade (95 percent interval +1.0 to +3.2), fitted to 68 years from 1951 to 2025.
Annual rain against the 1961-1990 mean
| Year | Annual rain, percent difference from the mean |
|---|---|
| 1951 | 6.9% |
| 1952 | -15.0% |
| 1953 | -15.5% |
| 1954 | 10.9% |
| 1955 | -17.5% |
| 1956 | -6.1% |
| 1957 | 4.0% |
| 1958 | 13.9% |
| 1959 | -7.2% |
| 1960 | 15.2% |
| 1961 | -2.8% |
| 1962 | -8.8% |
| 1963 | -5.2% |
| 1964 | -1.8% |
| 1965 | 2.1% |
| 1966 | 5.7% |
| 1967 | 4.5% |
| 1968 | -0.4% |
| 1969 | -10.1% |
| 1970 | 0.3% |
| 1971 | -17.4% |
| 1972 | -2.7% |
| 1973 | -6.3% |
| 1974 | 1.1% |
| 1975 | -17.8% |
| 1976 | -4.7% |
| 1977 | 1.2% |
| 1978 | 5.1% |
| 1979 | 9.4% |
| 1980 | 12.7% |
| 1981 | 7.0% |
| 1982 | 14.2% |
| 1983 | -4.4% |
| 1984 | -1.5% |
| 1985 | 9.5% |
| 1986 | 11.5% |
| 1987 | -7.2% |
| 1988 | 8.6% |
| 1989 | -5.0% |
| 1990 | 6.1% |
| 1991 | -4.9% |
| 1992 | 5.7% |
| 1993 | 6.6% |
| 1994 | 18.2% |
| 1995 | 7.4% |
| 1996 | 1.6% |
| 1997 | -1.1% |
| 1998 | 22.5% |
| 1999 | 19.1% |
| 2000 | 16.7% |
| 2001 | -14.2% |
| 2002 | 23.3% |
| 2003 | -9.7% |
| 2004 | 1.6% |
| 2005 | n/a |
| 2006 | n/a |
| 2007 | n/a |
| 2008 | n/a |
| 2009 | n/a |
| 2010 | n/a |
| 2011 | n/a |
| 2012 | 2.0% |
| 2013 | 3.8% |
| 2014 | 16.0% |
| 2015 | 26.5% |
| 2016 | 4.7% |
| 2017 | 5.8% |
| 2018 | 8.5% |
| 2019 | 12.4% |
| 2020 | 24.1% |
| 2021 | -3.0% |
| 2022 | 1.6% |
| 2023 | 25.2% |
| 2024 | 1.8% |
| 2025 | 9.1% |
The annual rain series uses stations with at least 50 complete years since 1951 and a 1961-1990 baseline. The decade charts use fixed sets of stations, the same in every decade from the 1960s. A dry day has less than 1 mm (0.04 in) of rain.
Longest Hot, Cold, Wet and Dry Streaks: Ireland
4 lists of 9- In Ireland, the longest run of frost days in a row in the data is 29 days, at Birr (Ireland), from 8 January 1963 to 5 February 1963.
- In Ireland, the longest run of ice days in a row in the data is 8 days, at Galway (Ireland), from 15 January 1881 to 22 January 1881.
- In Ireland, the longest run of dry days in a row in the data is 45 days, at Dublin Phoenix Park (Ireland), in 1943.
- In Ireland, the longest run of wet days in a row in the data is 38 days, at Ballyshannon (Cathleens Fall) (Ireland), in 2006.
Longest run of frost days (minimum at or below 0 C)
Consecutive days with a daily minimum at or below 0 C (32 F).
| Rank | Station | Country | Length | When |
|---|---|---|---|---|
| 1 | Birr | Ireland | 29 days | 8 January to 5 February 1963 |
| 2 | Galway | Ireland | 27 days | 23 January to 18 February 1917 |
| 3 | Dublin Phoenix Park | Ireland | 20 days | 7 to 26 January 1881 |
| 4 | Ballyshannon (Cathleens Fall) | Ireland | 19 days | 1 to 19 January 1985 |
| 5 | Waterford (Tycor) | Ireland | 17 days | 11 to 27 January 1963 |
| 6 | Valentia Observatory | Ireland | 10 days | 27 December 1961 to 5 January 1962 |
| 7 | Connaught | Ireland | 9 days | 3 to 11 March 1937 |
| 8 | Malin Head | Ireland | 7 days | 19 to 25 December 1938 |
| 9 | Belmullet | Ireland | 2 days | 8 to 9 January 2025 |
Longest run of ice days (maximum at or below 0 C)
Consecutive days with a daily maximum at or below 0 C (32 F).
| Rank | Station | Country | Length | When |
|---|---|---|---|---|
| 1 | Galway | Ireland | 8 days | 15 to 22 January 1881 |
| 2 | Birr | Ireland | 4 days | 9 to 12 January 1982 |
| 3 | Dublin Phoenix Park | Ireland | 3 days | 31 December 1961 to 2 January 1962 |
| 4 | Waterford (Tycor) | Ireland | 2 days | 12 to 13 January 1963 |
| 5 | Ballyshannon (Cathleens Fall) | Ireland | 2 days | 10 to 11 December 1981 |
| 6 | Connaught | Ireland | 2 days | 27 to 28 December 2000 |
| 7 | Casement | Ireland | 2 days | 7 to 8 January 2010 |
| 8 | Shannon | Ireland | 1 day | 17 to 17 January 1980 |
| 9 | Malin Head | Ireland | 1 day | 12 to 12 January 1987 |
| 10 | Valentia Observatory | Ireland | 1 day | 13 to 13 January 1987 |
Longest dry spell (days under 1 mm of rain), within one year
Consecutive days with less than 1 mm (0.04 in) of rain, the longest run within a year. The dates are not kept, so the list gives the year (within the year).
| Rank | Station | Country | Length | When |
|---|---|---|---|---|
| 1 | Dublin Phoenix Park | Ireland | 45 days | within 1943 |
| 2 | Valentia Observatory | Ireland | 40 days | within 1955 |
| 3 | Birr | Ireland | 40 days | within 1986 |
| 4 | Waterford (Tycor) | Ireland | 38 days | within 1970 |
| 5 | Galway | Ireland | 34 days | within 1861 |
| 6 | Rosslare | Ireland | 34 days | within 1980 |
| 7 | Malin Head | Ireland | 33 days | within 1911 |
| 8 | Shannon | Ireland | 24 days | within 2018 |
| 9 | Ballyshannon (Cathleens Fall) | Ireland | 23 days | within 1948 |
| 10 | Connaught | Ireland | 22 days | within 2020 |
Longest wet spell (days with 1 mm or more of rain), within one year
Consecutive days with 1 mm (0.04 in) or more of rain, the longest run within a year. The dates are not kept, so the list gives the year (within the year).
| Rank | Station | Country | Length | When |
|---|---|---|---|---|
| 1 | Ballyshannon (Cathleens Fall) | Ireland | 38 days | within 2006 |
| 2 | Belmullet | Ireland | 33 days | within 2014 |
| 3 | Valentia Observatory | Ireland | 32 days | within 1946 |
| 4 | Birr | Ireland | 28 days | within 1983 |
| 5 | Galway | Ireland | 27 days | within 1934 |
| 6 | Malin Head | Ireland | 25 days | within 1994 |
| 7 | Shannon | Ireland | 25 days | within 2020 |
| 8 | Waterford (Tycor) | Ireland | 21 days | within 2015 |
| 9 | Connaught | Ireland | 20 days | within 2020 |
| 10 | Dublin Phoenix Park | Ireland | 16 days | within 1879 |
A run belongs to the year it started in, even when it ran on into the next year. A station appears once per list, with its longest run in a complete year. Dry and wet spells are the longest run within a year. Lists use complete years only, so a long run in a year with gaps in the record is not counted.
Biggest One Day Temperature Swings: Ireland
6 lists of 7- In Ireland, the largest reported one day rise in the daily maximum is 12.2 C (22.0 F), at Galway (Ireland) on 20 November 1947.
- In Ireland, the largest reported one day drop in the daily maximum is 13.3 C (23.9 F), at Galway (Ireland) on 29 August 1869.
- In Ireland, the largest reported one day rise in the daily minimum is 19.1 C (34.4 F), at Galway (Ireland) on 16 November 1890.
- In Ireland, the largest reported one day drop in the daily minimum is 22.5 C (40.5 F), at Galway (Ireland) on 15 November 1890.
- In Ireland, the largest reported range between the high and the low of one day is 30.2 C (54.4 F), at Galway (Ireland) on 15 November 1890.
- In Ireland, the smallest reported range between the high and the low of one day is 0.0 C (0.0 F), at Galway (Ireland) on 6 May 1881.
Caveat.Single readings can still be instrument errors that quality control missed. A station with one faulty value can top a list, so read each entry as a reported value, not as a confirmed event.
Biggest one day rise in the daily maximum
The largest increase in the daily maximum temperature from one day to the next. Values are in degrees Celsius with Fahrenheit beside them.
| Rank | Station | Country | Value | Date |
|---|---|---|---|---|
| 1 | Galway | Ireland | 12.2 C (22.0 F) | 20 November 1947 |
| 2 | Birr | Ireland | 11.4 C (20.5 F) | 31 December 2000 |
| 3 | Dublin Phoenix Park | Ireland | 11.1 C (20.0 F) | 2 April 1944 |
| 4 | Valentia Observatory | Ireland | 9.9 C (17.8 F) | 19 April 1945 |
| 5 | Malin Head | Ireland | 9.6 C (17.3 F) | 26 June 2018 |
| 6 | Ballyshannon (Cathleens Fall) | Ireland | 9.6 C (17.3 F) | 25 June 2026 |
| 7 | Waterford (Tycor) | Ireland | 8.8 C (15.8 F) | 30 November 1975 |
Biggest one day drop in the daily maximum
The largest decrease in the daily maximum temperature from one day to the next. Values are in degrees Celsius with Fahrenheit beside them.
| Rank | Station | Country | Value | Date |
|---|---|---|---|---|
| 1 | Galway | Ireland | 13.3 C (23.9 F) | 29 August 1869 |
| 2 | Ballyshannon (Cathleens Fall) | Ireland | 13.0 C (23.4 F) | 27 May 2017 |
| 3 | Dublin Phoenix Park | Ireland | 12.9 C (23.2 F) | 29 August 1869 |
| 4 | Valentia Observatory | Ireland | 12.5 C (22.5 F) | 6 June 1942 |
| 5 | Malin Head | Ireland | 10.8 C (19.4 F) | 14 May 1965 |
| 6 | Birr | Ireland | 9.9 C (17.8 F) | 30 January 2006 |
| 7 | Waterford (Tycor) | Ireland | 8.8 C (15.8 F) | 5 June 1985 |
Biggest one day rise in the daily minimum
The largest increase in the daily minimum temperature from one day to the next. Values are in degrees Celsius with Fahrenheit beside them.
| Rank | Station | Country | Value | Date |
|---|---|---|---|---|
| 1 | Galway | Ireland | 19.1 C (34.4 F) | 16 November 1890 |
| 2 | Dublin Phoenix Park | Ireland | 15.7 C (28.3 F) | 27 December 2010 |
| 3 | Birr | Ireland | 12.5 C (22.5 F) | 26 December 1972 |
| 4 | Valentia Observatory | Ireland | 11.6 C (20.9 F) | 22 December 1946 |
| 5 | Waterford (Tycor) | Ireland | 11.4 C (20.5 F) | 31 January 2004 |
| 6 | Ballyshannon (Cathleens Fall) | Ireland | 10.8 C (19.4 F) | 4 December 1973 |
| 7 | Malin Head | Ireland | 8.9 C (16.0 F) | 30 June 1932 |
Biggest one day drop in the daily minimum
The largest decrease in the daily minimum temperature from one day to the next. Values are in degrees Celsius with Fahrenheit beside them.
| Rank | Station | Country | Value | Date |
|---|---|---|---|---|
| 1 | Galway | Ireland | 22.5 C (40.5 F) | 15 November 1890 |
| 2 | Dublin Phoenix Park | Ireland | 14.2 C (25.6 F) | 29 October 2014 |
| 3 | Waterford (Tycor) | Ireland | 12.1 C (21.8 F) | 18 October 1993 |
| 4 | Birr | Ireland | 12.0 C (21.6 F) | 26 January 1992 |
| 5 | Valentia Observatory | Ireland | 11.5 C (20.7 F) | 2 September 2016 |
| 6 | Ballyshannon (Cathleens Fall) | Ireland | 10.1 C (18.2 F) | 4 October 2007 |
| 7 | Malin Head | Ireland | 8.9 C (16.0 F) | 8 July 1934 |
Widest range between the high and the low of one day
The largest difference between the highest and the lowest temperature of the same day. Values are in degrees Celsius with Fahrenheit beside them.
| Rank | Station | Country | Value | Date |
|---|---|---|---|---|
| 1 | Galway | Ireland | 30.2 C (54.4 F) | 15 November 1890 |
| 2 | Dublin Phoenix Park | Ireland | 28.6 C (51.5 F) | 16 July 1876 |
| 3 | Birr | Ireland | 21.7 C (39.1 F) | 20 August 1976 |
| 4 | Valentia Observatory | Ireland | 19.4 C (34.9 F) | 2 June 1985 |
| 5 | Waterford (Tycor) | Ireland | 18.8 C (33.8 F) | 9 June 2005 |
| 6 | Ballyshannon (Cathleens Fall) | Ireland | 17.4 C (31.3 F) | 2 May 1973 |
| 7 | Malin Head | Ireland | 15.0 C (27.0 F) | 30 May 1978 |
Narrowest range between the high and the low of one day
The smallest difference between the highest and the lowest temperature of the same day. Values are in degrees Celsius with Fahrenheit beside them.
| Rank | Station | Country | Value | Date |
|---|---|---|---|---|
| 1 | Galway | Ireland | 0.0 C (0.0 F) | 6 May 1881 |
| 2 | Malin Head | Ireland | 0.0 C (0.0 F) | 18 September 1957 |
| 3 | Birr | Ireland | 0.0 C (0.0 F) | 1 April 1966 |
| 4 | Waterford (Tycor) | Ireland | 0.0 C (0.0 F) | 30 October 1982 |
| 5 | Dublin Phoenix Park | Ireland | 0.0 C (0.0 F) | 13 December 2013 |
| 6 | Ballyshannon (Cathleens Fall) | Ireland | 0.0 C (0.0 F) | 18 December 2024 |
| 7 | Valentia Observatory | Ireland | 0.4 C (0.7 F) | 13 January 2025 |
Only stations with at least 10 complete years are listed, and a station appears once per list.
Download the Data
Source: NOAA National Centers for Environmental Information, Global Historical Climatology Network Daily (GHCN-Daily). Records are computed by World Extreme Weather Monitor and are not official NOAA products. (US Government open data (NOAA NCEI)) Data as of 2026-10-13. Trends and counts are computed by this site from daily station records. The long-record station set is described under each chart.