Ottawa 4SW Weather Records (USC00116526)
Record envelope, standing records and threshold days for Ottawa 4SW (USC00116526), Illinois, United States, with 135 years of record.
Key Facts for Ottawa 4SW
- Ottawa 4SW (USC00116526) is a weather station in Illinois, United States at 41.33 latitude and -88.91 longitude, 166 m (545 ft) above sea level.
- The station reports from 1892 to 2026, 135 years of record.
- 1,464 records set at Ottawa 4SW still stand.
- Records are tracked for tmax, tmin, prcp, snow, snwd: an element needs 30 years of data to be eligible.
- Ottawa 4SW set a daily record high minimum temperature of 16.7 C (62.1 F) on 13 October 2026 (provisional).
Provisional Records
Records set in the last 60 days are provisional until they clear the revision window.
About the Station
- Location: Illinois, United States, 41.33 latitude, -88.91 longitude.
- Elevation: 166 m (545 ft).
- Period of record: 1892 to 2026, 135 years.
- Eligible elements: tmax, tmin, prcp, snow, snwd.
Daily Record Envelope and 2026
4 days at or beyond a record| Month | Highest record high | Lowest record low | 2026 highest maximum | 2026 lowest minimum |
|---|---|---|---|---|
| Jan | 20.0 C (68.0 F) | -32.2 C (-26.0 F) | 15.6 C (60.1 F) | -22.2 C (-8.0 F) |
| Feb | 22.8 C (73.0 F) | -30.6 C (-23.1 F) | 19.4 C (66.9 F) | -16.7 C (1.9 F) |
| Mar | 29.4 C (84.9 F) | -22.8 C (-9.0 F) | 28.3 C (82.9 F) | -12.8 C (9.0 F) |
| Apr | 33.9 C (93.0 F) | -11.1 C (12.0 F) | 27.8 C (82.0 F) | -1.7 C (28.9 F) |
| May | 41.1 C (106.0 F) | -3.3 C (26.1 F) | 30.0 C (86.0 F) | 1.1 C (34.0 F) |
| Jun | 41.7 C (107.1 F) | 1.7 C (35.1 F) | 31.7 C (89.1 F) | 9.4 C (48.9 F) |
| Jul | 44.4 C (111.9 F) | 3.9 C (39.0 F) | 33.3 C (91.9 F) | 11.1 C (52.0 F) |
| Aug | 41.7 C (107.1 F) | 0.6 C (33.1 F) | 31.1 C (88.0 F) | 12.8 C (55.0 F) |
| Sep | 39.4 C (102.9 F) | -3.9 C (25.0 F) | 33.3 C (91.9 F) | 7.8 C (46.0 F) |
| Oct | 34.4 C (93.9 F) | -10.6 C (12.9 F) | 30.0 C (86.0 F) | 6.1 C (43.0 F) |
| Nov | 28.3 C (82.9 F) | -21.1 C (-6.0 F) | n/a | n/a |
| Dec | 21.7 C (71.1 F) | -30.6 C (-23.1 F) | n/a | n/a |
Which Years Hold Standing Records
1,464 standing records| Year set | Standing records |
|---|---|
| 1892 | 2 |
| 1893 | 17 |
| 1894 | 21 |
| 1895 | 33 |
| 1896 | 18 |
| 1897 | 19 |
| 1898 | 5 |
| 1899 | 21 |
| 1900 | 8 |
| 1901 | 15 |
| 1902 | 8 |
| 1903 | 8 |
| 1904 | 7 |
| 1905 | 14 |
| 1906 | 9 |
| 1907 | 6 |
| 1908 | 9 |
| 1909 | 14 |
| 1910 | 15 |
| 1911 | 14 |
| 1912 | 12 |
| 1913 | 16 |
| 1914 | 9 |
| 1915 | 18 |
| 1916 | 15 |
| 1917 | 3 |
| 1918 | 12 |
| 1919 | 4 |
| 1920 | 9 |
| 1921 | 11 |
| 1922 | 10 |
| 1923 | 17 |
| 1924 | 10 |
| 1925 | 29 |
| 1926 | 12 |
| 1927 | 9 |
| 1928 | 15 |
| 1929 | 17 |
| 1930 | 28 |
| 1931 | 18 |
| 1932 | 12 |
| 1933 | 17 |
| 1934 | 29 |
| 1935 | 10 |
| 1936 | 38 |
| 1937 | 12 |
| 1938 | 14 |
| 1939 | 13 |
| 1940 | 9 |
| 1941 | 8 |
| 1942 | 14 |
| 1943 | 4 |
| 1944 | 12 |
| 1945 | 10 |
| 1946 | 8 |
| 1947 | 13 |
| 1948 | 4 |
| 1949 | 6 |
| 1950 | 18 |
| 1951 | 12 |
| 1952 | 9 |
| 1953 | 12 |
| 1954 | 8 |
| 1955 | 7 |
| 1956 | 7 |
| 1957 | 5 |
| 1958 | 9 |
| 1959 | 11 |
| 1960 | 15 |
| 1961 | 5 |
| 1962 | 11 |
| 1963 | 14 |
| 1964 | 6 |
| 1965 | 9 |
| 1966 | 7 |
| 1967 | 9 |
| 1968 | 8 |
| 1969 | 5 |
| 1970 | 8 |
| 1971 | 11 |
| 1972 | 7 |
| 1973 | 5 |
| 1974 | 10 |
| 1975 | 11 |
| 1976 | 9 |
| 1977 | 8 |
| 1978 | 8 |
| 1979 | 9 |
| 1980 | 10 |
| 1981 | 8 |
| 1982 | 14 |
| 1983 | 17 |
| 1984 | 7 |
| 1985 | 9 |
| 1986 | 15 |
| 1987 | 2 |
| 1988 | 12 |
| 1989 | 19 |
| 1990 | 12 |
| 1991 | 16 |
| 1992 | 15 |
| 1993 | 3 |
| 1994 | 7 |
| 1995 | 6 |
| 1996 | 10 |
| 1997 | 6 |
| 1998 | 17 |
| 1999 | 10 |
| 2000 | 14 |
| 2001 | 2 |
| 2002 | 12 |
| 2003 | 6 |
| 2004 | 8 |
| 2005 | 3 |
| 2006 | 11 |
| 2007 | 9 |
| 2008 | 8 |
| 2009 | 6 |
| 2010 | 2 |
| 2011 | 3 |
| 2012 | 18 |
| 2013 | 3 |
| 2014 | 17 |
| 2015 | 3 |
| 2016 | 4 |
| 2017 | 13 |
| 2018 | 16 |
| 2019 | 14 |
| 2020 | 5 |
| 2021 | 8 |
| 2022 | 4 |
| 2023 | 2 |
| 2024 | 5 |
| 2025 | 1 |
| 2026 | 9 |
All-Time Record Progression
13 new records| Date | Kind | Detail |
|---|---|---|
| 1924-08-09 | Record daily precipitation | Record daily precipitation 167.9 mm (6.6 in) |
| 1931-07-29 | Record high minimum temperature | Record high minimum temperature 26.7 C (80.1 F) |
| 1942-07-18 | Record high minimum temperature | Record high minimum temperature 27.2 C (81.0 F) |
| 1951-12-21 | Record snow depth | Record snow depth 38.1 cm (15.0 in) |
| 1958-07-14 | Record daily precipitation | Record daily precipitation 222.8 mm (8.8 in) |
| 1963-02-01 | Record snow depth | Record snow depth 40.6 cm (16.0 in) |
| 1979-01-13 | Record snow depth | Record snow depth 66.0 cm (26.0 in) |
| 1979-01-14 | Record snow depth | Record snow depth 68.6 cm (27.0 in) |
| 1979-01-15 | Record snow depth | Record snow depth 71.1 cm (28.0 in) |
| 1979-01-27 | Record snow depth | Record snow depth 73.7 cm (29.0 in) |
| 1979-01-31 | Record snow depth | Record snow depth 76.2 cm (30.0 in) |
| 1983-12-25 | Record low maximum temperature | Record low maximum temperature -22.2 C (-8.0 F) |
| 1989-12-22 | Record low maximum temperature | Record low maximum temperature -23.9 C (-11.0 F) |
Wettest Day of Each Month
Jul: 222.8 mm (8.8 in)| Month | Record daily precipitation (mm) | Date |
|---|---|---|
| Jan | 51.3 mm (2.0 in) | 3 January 1897 |
| Feb | 72.4 mm (2.9 in) | 21 February 1997 |
| Mar | 92.7 mm (3.6 in) | 19 March 1948 |
| Apr | 114.3 mm (4.5 in) | 30 April 2017 |
| May | 81.3 mm (3.2 in) | 17 May 1974 |
| Jun | 86.1 mm (3.4 in) | 12 June 1929 |
| Jul | 222.8 mm (8.8 in) | 14 July 1958 |
| Aug | 167.9 mm (6.6 in) | 9 August 1924 |
| Sep | 111.8 mm (4.4 in) | 28 September 2019 |
| Oct | 85.1 mm (3.4 in) | 25 October 2021 |
| Nov | 55.9 mm (2.2 in) | 5 November 1902 |
| Dec | 70.9 mm (2.8 in) | 24 December 1965 |
Period of Record Coverage
1892 to 2026| Year | Days with data | Share of year | Complete |
|---|---|---|---|
| 1892 | 31 | 8% | No |
| 1893 | 351 | 96% | Yes |
| 1894 | 353 | 97% | Yes |
| 1895 | 360 | 99% | Yes |
| 1896 | 353 | 96% | Yes |
| 1897 | 364 | 100% | Yes |
| 1898 | 363 | 99% | Yes |
| 1899 | 365 | 100% | Yes |
| 1900 | 359 | 98% | Yes |
| 1901 | 365 | 100% | Yes |
| 1902 | 365 | 100% | Yes |
| 1903 | 365 | 100% | Yes |
| 1904 | 366 | 100% | Yes |
| 1905 | 358 | 98% | Yes |
| 1906 | 365 | 100% | Yes |
| 1907 | 361 | 99% | Yes |
| 1908 | 366 | 100% | Yes |
| 1909 | 365 | 100% | Yes |
| 1910 | 364 | 100% | Yes |
| 1911 | 361 | 99% | Yes |
| 1912 | 348 | 95% | Yes |
| 1913 | 364 | 100% | Yes |
| 1914 | 306 | 84% | No |
| 1915 | 364 | 100% | Yes |
| 1916 | 351 | 96% | Yes |
| 1917 | 231 | 63% | No |
| 1918 | 271 | 74% | No |
| 1919 | 178 | 49% | No |
| 1920 | 194 | 53% | No |
| 1921 | 270 | 74% | No |
| 1922 | 329 | 90% | Yes |
| 1923 | 354 | 97% | Yes |
| 1924 | 366 | 100% | Yes |
| 1925 | 365 | 100% | Yes |
| 1926 | 365 | 100% | Yes |
| 1927 | 365 | 100% | Yes |
| 1928 | 365 | 100% | Yes |
| 1929 | 365 | 100% | Yes |
| 1930 | 365 | 100% | Yes |
| 1931 | 365 | 100% | Yes |
| 1932 | 366 | 100% | Yes |
| 1933 | 365 | 100% | Yes |
| 1934 | 365 | 100% | Yes |
| 1935 | 365 | 100% | Yes |
| 1936 | 366 | 100% | Yes |
| 1937 | 365 | 100% | Yes |
| 1938 | 365 | 100% | Yes |
| 1939 | 365 | 100% | Yes |
| 1940 | 365 | 100% | Yes |
| 1941 | 365 | 100% | Yes |
| 1942 | 365 | 100% | Yes |
| 1943 | 364 | 100% | Yes |
| 1944 | 366 | 100% | Yes |
| 1945 | 365 | 100% | Yes |
| 1946 | 365 | 100% | Yes |
| 1947 | 365 | 100% | Yes |
| 1948 | 366 | 100% | Yes |
| 1949 | 364 | 100% | Yes |
| 1950 | 363 | 99% | Yes |
| 1951 | 358 | 98% | Yes |
| 1952 | 357 | 98% | Yes |
| 1953 | 363 | 99% | Yes |
| 1954 | 361 | 99% | Yes |
| 1955 | 361 | 99% | Yes |
| 1956 | 364 | 99% | Yes |
| 1957 | 365 | 100% | Yes |
| 1958 | 364 | 100% | Yes |
| 1959 | 364 | 100% | Yes |
| 1960 | 366 | 100% | Yes |
| 1961 | 365 | 100% | Yes |
| 1962 | 365 | 100% | Yes |
| 1963 | 365 | 100% | Yes |
| 1964 | 363 | 99% | Yes |
| 1965 | 365 | 100% | Yes |
| 1966 | 364 | 100% | Yes |
| 1967 | 365 | 100% | Yes |
| 1968 | 366 | 100% | Yes |
| 1969 | 365 | 100% | Yes |
| 1970 | 365 | 100% | Yes |
| 1971 | 365 | 100% | Yes |
| 1972 | 365 | 100% | Yes |
| 1973 | 365 | 100% | Yes |
| 1974 | 360 | 99% | Yes |
| 1975 | 351 | 96% | Yes |
| 1976 | 345 | 94% | Yes |
| 1977 | 350 | 96% | Yes |
| 1978 | 350 | 96% | Yes |
| 1979 | 349 | 96% | Yes |
| 1980 | 353 | 96% | Yes |
| 1981 | 350 | 96% | Yes |
| 1982 | 357 | 98% | Yes |
| 1983 | 352 | 96% | Yes |
| 1984 | 366 | 100% | Yes |
| 1985 | 364 | 100% | Yes |
| 1986 | 334 | 92% | Yes |
| 1987 | 361 | 99% | Yes |
| 1988 | 365 | 100% | Yes |
| 1989 | 363 | 99% | Yes |
| 1990 | 364 | 100% | Yes |
| 1991 | 363 | 99% | Yes |
| 1992 | 362 | 99% | Yes |
| 1993 | 363 | 99% | Yes |
| 1994 | 361 | 99% | Yes |
| 1995 | 359 | 98% | Yes |
| 1996 | 357 | 98% | Yes |
| 1997 | 361 | 99% | Yes |
| 1998 | 364 | 100% | Yes |
| 1999 | 362 | 99% | Yes |
| 2000 | 345 | 94% | Yes |
| 2001 | 358 | 98% | Yes |
| 2002 | 363 | 99% | Yes |
| 2003 | 364 | 100% | Yes |
| 2004 | 365 | 100% | Yes |
| 2005 | 362 | 99% | Yes |
| 2006 | 362 | 99% | Yes |
| 2007 | 319 | 87% | No |
| 2008 | 361 | 99% | Yes |
| 2009 | 357 | 98% | Yes |
| 2010 | 363 | 99% | Yes |
| 2011 | 359 | 98% | Yes |
| 2012 | 353 | 96% | Yes |
| 2013 | 352 | 96% | Yes |
| 2014 | 360 | 99% | Yes |
| 2015 | 358 | 98% | Yes |
| 2016 | 356 | 97% | Yes |
| 2017 | 344 | 94% | Yes |
| 2018 | 355 | 97% | Yes |
| 2019 | 360 | 99% | Yes |
| 2020 | 344 | 94% | Yes |
| 2021 | 355 | 97% | Yes |
| 2022 | 356 | 98% | Yes |
| 2023 | 364 | 100% | Yes |
| 2024 | 366 | 100% | Yes |
| 2025 | 365 | 100% | Yes |
| 2026 | 285 | 78% | No |
Latest Records
20| Date | Station | Record | Value | Beat old record by | Old record stood | Significance |
|---|---|---|---|---|---|---|
| 13 October 2026 | Ottawa 4SW, US | daily high min (Provisional) | 16.7 C (62.1 F) | 1.1 C (2.0 F) | 126 years | 42 of 100 (Notable) |
| 2 October 2026 | Ottawa 4SW, US | daily rain (Provisional) | 33.5 mm (1.3 in) | 4.3 mm (0.17 in) | 81 years | 38 of 100 (Notable) |
| 5 September 2026 | Ottawa 4SW, US | daily high min (Provisional) | 22.8 C (73.0 F) | 0.6 C (1.1 F) | 40 years | 23 of 100 (Routine) |
| 10 August 2026 | Ottawa 4SW, US | daily rain | 34.3 mm (1.4 in) | 6.1 mm (0.24 in) | 32 years | 23 of 100 (Routine) |
| 2 August 2026 | Ottawa 4SW, US | daily low max | 19.4 C (66.9 F) | 1.2 C (2.2 F) | 16 years | 18 of 100 (Routine) |
| 22 June 2026 | Ottawa 4SW, US | daily low max | 17.8 C (64.0 F) | 0.5 C (0.9 F) | 75 years | 33 of 100 (Routine) |
| 11 June 2026 | Ottawa 4SW, US | daily rain | 53.3 mm (2.1 in) | 11.6 mm (0.5 in) | 28 years | 27 of 100 (Routine) |
| 13 April 2026 | Ottawa 4SW, US | daily high min (Tie) | 15.6 C (60.1 F) | tie | 48 years | 6 of 100 (Routine) |
| 3 April 2026 | Ottawa 4SW, US | daily rain | 38.1 mm (1.5 in) | 0.3 mm (0.01 in) | 12 years | 13 of 100 (Routine) |
| 27 March 2026 | Ottawa 4SW, US | daily high max | 28.3 C (82.9 F) | 0.5 C (0.9 F) | 80 years | 34 of 100 (Routine) |
| 18 March 2026 | Ottawa 4SW, US | daily low max | -3.3 C (26.1 F) | 0.5 C (0.9 F) | 87 years | 36 of 100 (Notable) |
| 11 March 2026 | Ottawa 4SW, US | daily high max | 25.6 C (78.1 F) | 1.2 C (2.2 F) | 53 years | 27 of 100 (Routine) |
| 10 March 2026 | Ottawa 4SW, US | daily high min | 7.8 C (46.0 F) | 1.7 C (3.1 F) | 40 years | 25 of 100 (Routine) |
| 17 February 2026 | Ottawa 4SW, US | daily high max | 18.9 C (66.0 F) | 4.5 C (8.1 F) | 115 years | 46 of 100 (Notable) |
| 24 January 2026 | Ottawa 4SW, US | daily low max (Tie) | -17.2 C (1.0 F) | tie | 90 years | 9 of 100 (Routine) |
| 9 January 2026 | Ottawa 4SW, US | daily high min | 4.4 C (39.9 F) | 2.2 C (4.0 F) | 91 years | 40 of 100 (Notable) |
| 9 January 2026 | Ottawa 4SW, US | daily high max | 15.6 C (60.1 F) | 0.6 C (1.1 F) | 23 years | 16 of 100 (Routine) |
| 9 January 2026 | Ottawa 4SW, US | daily rain (Tie) | 24.9 mm (1.0 in) | tie | 80 years | 8 of 100 (Routine) |
| 14 December 2025 | Ottawa 4SW, US | daily low max (Tie) | -12.2 C (10.0 F) | tie | 99 years | 9 of 100 (Routine) |
| 5 December 2025 | Ottawa 4SW, US | daily low max | -6.7 C (19.9 F) | 1.1 C (2.0 F) | 34 years | 21 of 100 (Routine) |
Climate Trend
119 complete years, 1893 to 2025| Year | Annual mean temperature | Difference from the station mean |
|---|---|---|
| 1893 | 8.8 C | -1.75 C |
| 1894 | 10.6 C | +0.05 C |
| 1895 | 8.8 C | -1.74 C |
| 1896 | 10.3 C | -0.26 C |
| 1897 | 10.1 C | -0.44 C |
| 1898 | 10.1 C | -0.53 C |
| 1899 | 10.1 C | -0.51 C |
| 1900 | 11.4 C | +0.79 C |
| 1901 | 10.7 C | +0.13 C |
| 1902 | 10.8 C | +0.18 C |
| 1903 | 10.6 C | +0.03 C |
| 1904 | 9.3 C | -1.27 C |
| 1905 | 10.0 C | -0.58 C |
| 1907 | 10.0 C | -0.57 C |
| 1908 | 11.1 C | +0.55 C |
| 1909 | 10.1 C | -0.46 C |
| 1910 | 10.4 C | -0.23 C |
| 1911 | 11.2 C | +0.57 C |
| 1912 | 9.5 C | -1.07 C |
| 1915 | 10.3 C | -0.26 C |
| 1916 | 10.9 C | +0.27 C |
| 1924 | 8.9 C | -1.70 C |
| 1925 | 10.3 C | -0.31 C |
| 1926 | 9.6 C | -0.98 C |
| 1927 | 10.7 C | +0.15 C |
| 1928 | 10.6 C | +0.00 C |
| 1929 | 9.4 C | -1.17 C |
| 1930 | 11.0 C | +0.43 C |
| 1931 | 12.4 C | +1.82 C |
| 1932 | 10.8 C | +0.22 C |
| 1933 | 11.5 C | +0.95 C |
| 1934 | 11.7 C | +1.09 C |
| 1935 | 10.3 C | -0.26 C |
| 1936 | 10.2 C | -0.38 C |
| 1937 | 9.7 C | -0.85 C |
| 1938 | 11.3 C | +0.68 C |
| 1939 | 11.2 C | +0.62 C |
| 1940 | 10.5 C | -0.12 C |
| 1941 | 11.8 C | +1.20 C |
| 1942 | 11.0 C | +0.41 C |
| 1943 | 10.4 C | -0.19 C |
| 1944 | 11.3 C | +0.67 C |
| 1945 | 10.2 C | -0.39 C |
| 1946 | 12.0 C | +1.40 C |
| 1947 | 10.8 C | +0.19 C |
| 1948 | 10.8 C | +0.19 C |
| 1949 | 11.4 C | +0.85 C |
| 1950 | 9.9 C | -0.68 C |
| 1951 | 9.9 C | -0.64 C |
| 1952 | 11.5 C | +0.96 C |
| 1953 | 11.8 C | +1.23 C |
| 1954 | 11.8 C | +1.19 C |
| 1955 | 11.2 C | +0.60 C |
| 1956 | 11.4 C | +0.86 C |
| 1957 | 10.8 C | +0.17 C |
| 1958 | 10.0 C | -0.55 C |
| 1959 | 10.8 C | +0.26 C |
| 1960 | 10.2 C | -0.35 C |
| 1961 | 10.8 C | +0.20 C |
| 1962 | 10.5 C | -0.12 C |
| 1963 | 10.4 C | -0.19 C |
| 1964 | 11.5 C | +0.94 C |
| 1965 | 11.1 C | +0.47 C |
| 1966 | 10.5 C | -0.04 C |
| 1967 | 10.3 C | -0.31 C |
| 1968 | 11.0 C | +0.41 C |
| 1969 | 10.2 C | -0.34 C |
| 1970 | 10.7 C | +0.09 C |
| 1971 | 11.5 C | +0.96 C |
| 1972 | 9.9 C | -0.68 C |
| 1973 | 11.8 C | +1.25 C |
| 1974 | 10.9 C | +0.36 C |
| 1975 | 11.3 C | +0.75 C |
| 1976 | 10.2 C | -0.36 C |
| 1977 | 11.2 C | +0.62 C |
| 1978 | 10.3 C | -0.32 C |
| 1979 | 10.1 C | -0.47 C |
| 1980 | 11.1 C | +0.53 C |
| 1981 | 11.5 C | +0.93 C |
| 1982 | 10.8 C | +0.23 C |
| 1983 | 10.9 C | +0.34 C |
| 1984 | 9.9 C | -0.66 C |
| 1985 | 9.2 C | -1.35 C |
| 1987 | 11.3 C | +0.75 C |
| 1988 | 10.2 C | -0.42 C |
| 1989 | 9.0 C | -1.57 C |
| 1990 | 11.0 C | +0.42 C |
| 1991 | 11.3 C | +0.67 C |
| 1992 | 10.1 C | -0.49 C |
| 1993 | 9.7 C | -0.89 C |
| 1994 | 10.3 C | -0.26 C |
| 1995 | 10.1 C | -0.44 C |
| 1996 | 9.0 C | -1.62 C |
| 1997 | 9.5 C | -1.10 C |
| 1998 | 12.4 C | +1.80 C |
| 1999 | 11.0 C | +0.46 C |
| 2001 | 11.6 C | +1.02 C |
| 2002 | 10.9 C | +0.33 C |
| 2003 | 10.2 C | -0.40 C |
| 2004 | 10.6 C | +0.01 C |
| 2005 | 11.3 C | +0.67 C |
| 2006 | 11.4 C | +0.80 C |
| 2008 | 9.5 C | -1.11 C |
| 2009 | 9.6 C | -0.95 C |
| 2010 | 10.9 C | +0.31 C |
| 2011 | 10.8 C | +0.23 C |
| 2012 | 12.6 C | +2.04 C |
| 2013 | 9.5 C | -1.04 C |
| 2014 | 8.4 C | -2.18 C |
| 2015 | 10.5 C | -0.09 C |
| 2016 | 11.4 C | +0.83 C |
| 2017 | 11.1 C | +0.52 C |
| 2018 | 10.0 C | -0.63 C |
| 2019 | 9.5 C | -1.10 C |
| 2021 | 10.6 C | +0.01 C |
| 2022 | 9.2 C | -1.35 C |
| 2023 | 10.8 C | +0.25 C |
| 2024 | 11.4 C | +0.77 C |
| 2025 | 10.3 C | -0.25 C |
The fitted trend in annual mean temperature here over 1893 to 2025 is 0.01 C (-0.03 to 0.05) per decade. The interval includes zero, so the trend is not clearly different from zero. In Fahrenheit: 0.02 F (-0.05 to 0.09) per decade. The slope is a straight line fitted to 119 complete years; the brackets give its 95 percent interval.
| Measure | Per decade (C) | Per decade (F) | Period | Complete years | Reading |
|---|---|---|---|---|---|
| Annual mean temperature | 0.01 C (-0.03 to 0.05) per decade | 0.02 F (-0.05 to 0.09) per decade | 1893 to 2025 | 119 | Not clearly different from zero |
| Mean daily maximum | -0.06 C (-0.10 to -0.01) per decade | -0.10 F (-0.18 to -0.03) per decade | 1893 to 2025 | 119 | Fall |
| Mean daily minimum | 0.08 C (0.04 to 0.13) per decade | 0.1 F (0.1 to 0.2) per decade | 1893 to 2025 | 119 | Rise |
A year is complete when all 12 months have at least 20 days of both daily maximum and daily minimum readings. The annual mean is the mean of the monthly means. The trend describes this one station over this period; it does not say what caused the change.
Extremes by Year
1892 to 2026| Measure | Record | Year of the record | Median year | Years with a value |
|---|---|---|---|---|
| Hottest day (TXx) | 44.4 C (111.9 F) | 1901 | 36.7 C (98.1 F) | 135 |
| Coldest night (TNn) | -32.2 C (-26.0 F) | 1893 | -23.9 C (-11.0 F) | 135 |
| Wettest day (Rx1day) | 222.8 mm (8.8 in) | 1958 | 57.2 mm (2.3 in) | 135 |
| Wettest five days (Rx5day) | 256.1 mm (10.1 in) | 2007 | 93.2 mm (3.7 in) | 135 |
| Longest dry spell (CDD) | 39 days | 1969 | 21 days | 135 |
Hottest day (TXx)
| Year | Hottest day (TXx) |
|---|---|
| 1892 | 36.7 C (98.1 F) |
| 1893 | 37.8 C (100.0 F) |
| 1894 | 39.4 C (102.9 F) |
| 1895 | 38.9 C (102.0 F) |
| 1896 | 37.2 C (99.0 F) |
| 1897 | 37.8 C (100.0 F) |
| 1898 | 37.8 C (100.0 F) |
| 1899 | 39.4 C (102.9 F) |
| 1900 | 37.8 C (100.0 F) |
| 1901 | 44.4 C (111.9 F) |
| 1902 | 35.6 C (96.1 F) |
| 1903 | 36.7 C (98.1 F) |
| 1904 | 33.9 C (93.0 F) |
| 1905 | 36.7 C (98.1 F) |
| 1906 | 36.1 C (97.0 F) |
| 1907 | 33.9 C (93.0 F) |
| 1908 | 38.3 C (100.9 F) |
| 1909 | 36.1 C (97.0 F) |
| 1910 | 38.3 C (100.9 F) |
| 1911 | 37.8 C (100.0 F) |
| 1912 | 37.2 C (99.0 F) |
| 1913 | 42.2 C (108.0 F) |
| 1914 | 39.4 C (102.9 F) |
| 1915 | 33.3 C (91.9 F) |
| 1916 | 41.7 C (107.1 F) |
| 1917 | 39.4 C (102.9 F) |
| 1918 | 41.7 C (107.1 F) |
| 1919 | 27.2 C (81.0 F) |
| 1920 | 39.4 C (102.9 F) |
| 1921 | 38.9 C (102.0 F) |
| 1922 | 38.3 C (100.9 F) |
| 1923 | 37.8 C (100.0 F) |
| 1924 | 34.4 C (93.9 F) |
| 1925 | 38.9 C (102.0 F) |
| 1926 | 37.2 C (99.0 F) |
| 1927 | 36.7 C (98.1 F) |
| 1928 | 36.1 C (97.0 F) |
| 1929 | 35.6 C (96.1 F) |
| 1930 | 41.1 C (106.0 F) |
| 1931 | 39.4 C (102.9 F) |
| 1932 | 37.8 C (100.0 F) |
| 1933 | 38.9 C (102.0 F) |
| 1934 | 42.2 C (108.0 F) |
| 1935 | 36.7 C (98.1 F) |
| 1936 | 44.4 C (111.9 F) |
| 1937 | 37.8 C (100.0 F) |
| 1938 | 35.0 C (95.0 F) |
| 1939 | 38.3 C (100.9 F) |
| 1940 | 41.7 C (107.1 F) |
| 1941 | 38.9 C (102.0 F) |
| 1942 | 37.2 C (99.0 F) |
| 1943 | 37.8 C (100.0 F) |
| 1944 | 38.3 C (100.9 F) |
| 1945 | 39.4 C (102.9 F) |
| 1946 | 38.3 C (100.9 F) |
| 1947 | 40.0 C (104.0 F) |
| 1948 | 37.8 C (100.0 F) |
| 1949 | 37.8 C (100.0 F) |
| 1950 | 35.6 C (96.1 F) |
| 1951 | 35.6 C (96.1 F) |
| 1952 | 37.8 C (100.0 F) |
| 1953 | 38.3 C (100.9 F) |
| 1954 | 37.8 C (100.0 F) |
| 1955 | 38.3 C (100.9 F) |
| 1956 | 38.9 C (102.0 F) |
| 1957 | 35.0 C (95.0 F) |
| 1958 | 33.9 C (93.0 F) |
| 1959 | 35.6 C (96.1 F) |
| 1960 | 35.6 C (96.1 F) |
| 1961 | 35.0 C (95.0 F) |
| 1962 | 36.1 C (97.0 F) |
| 1963 | 37.8 C (100.0 F) |
| 1964 | 37.2 C (99.0 F) |
| 1965 | 37.8 C (100.0 F) |
| 1966 | 38.3 C (100.9 F) |
| 1967 | 35.0 C (95.0 F) |
| 1968 | 36.1 C (97.0 F) |
| 1969 | 36.1 C (97.0 F) |
| 1970 | 37.8 C (100.0 F) |
| 1971 | 37.2 C (99.0 F) |
| 1972 | 35.6 C (96.1 F) |
| 1973 | 36.7 C (98.1 F) |
| 1974 | 38.3 C (100.9 F) |
| 1975 | 35.6 C (96.1 F) |
| 1976 | 38.3 C (100.9 F) |
| 1977 | 38.3 C (100.9 F) |
| 1978 | 37.2 C (99.0 F) |
| 1979 | 36.1 C (97.0 F) |
| 1980 | 37.8 C (100.0 F) |
| 1981 | 36.7 C (98.1 F) |
| 1982 | 35.0 C (95.0 F) |
| 1983 | 38.3 C (100.9 F) |
| 1984 | 35.6 C (96.1 F) |
| 1985 | 33.9 C (93.0 F) |
| 1986 | 33.3 C (91.9 F) |
| 1987 | 35.0 C (95.0 F) |
| 1988 | 38.9 C (102.0 F) |
| 1989 | 36.1 C (97.0 F) |
| 1990 | 37.8 C (100.0 F) |
| 1991 | 37.8 C (100.0 F) |
| 1992 | 33.3 C (91.9 F) |
| 1993 | 33.3 C (91.9 F) |
| 1994 | 34.4 C (93.9 F) |
| 1995 | 37.8 C (100.0 F) |
| 1996 | 33.3 C (91.9 F) |
| 1997 | 35.6 C (96.1 F) |
| 1998 | 36.1 C (97.0 F) |
| 1999 | 40.0 C (104.0 F) |
| 2000 | 36.7 C (98.1 F) |
| 2001 | 36.1 C (97.0 F) |
| 2002 | 36.7 C (98.1 F) |
| 2003 | 36.1 C (97.0 F) |
| 2004 | 32.8 C (91.0 F) |
| 2005 | 39.4 C (102.9 F) |
| 2006 | 36.1 C (97.0 F) |
| 2007 | 33.9 C (93.0 F) |
| 2008 | 32.2 C (90.0 F) |
| 2009 | 34.4 C (93.9 F) |
| 2010 | 34.4 C (93.9 F) |
| 2011 | 36.1 C (97.0 F) |
| 2012 | 40.0 C (104.0 F) |
| 2013 | 35.6 C (96.1 F) |
| 2014 | 32.2 C (90.0 F) |
| 2015 | 34.4 C (93.9 F) |
| 2016 | 32.8 C (91.0 F) |
| 2017 | 35.0 C (95.0 F) |
| 2018 | 35.6 C (96.1 F) |
| 2019 | 33.3 C (91.9 F) |
| 2020 | 33.3 C (91.9 F) |
| 2021 | 34.4 C (93.9 F) |
| 2022 | 34.4 C (93.9 F) |
| 2023 | 35.6 C (96.1 F) |
| 2024 | 34.4 C (93.9 F) |
| 2025 | 32.8 C (91.0 F) |
| 2026 | 33.3 C (91.9 F) |
Coldest night (TNn)
| Year | Coldest night (TNn) |
|---|---|
| 1892 | 9.4 C (48.9 F) |
| 1893 | -32.2 C (-26.0 F) |
| 1894 | -26.7 C (-16.1 F) |
| 1895 | -28.9 C (-20.0 F) |
| 1896 | -22.8 C (-9.0 F) |
| 1897 | -29.4 C (-20.9 F) |
| 1898 | -22.2 C (-8.0 F) |
| 1899 | -30.6 C (-23.1 F) |
| 1900 | -21.7 C (-7.1 F) |
| 1901 | -24.4 C (-11.9 F) |
| 1902 | -25.6 C (-14.1 F) |
| 1903 | -25.0 C (-13.0 F) |
| 1904 | -23.9 C (-11.0 F) |
| 1905 | -30.6 C (-23.1 F) |
| 1906 | -16.1 C (3.0 F) |
| 1907 | -21.7 C (-7.1 F) |
| 1908 | -21.1 C (-6.0 F) |
| 1909 | -23.9 C (-11.0 F) |
| 1910 | -23.9 C (-11.0 F) |
| 1911 | -20.6 C (-5.1 F) |
| 1912 | -26.7 C (-16.1 F) |
| 1913 | -21.1 C (-6.0 F) |
| 1914 | -28.3 C (-18.9 F) |
| 1915 | -27.8 C (-18.0 F) |
| 1916 | -26.1 C (-15.0 F) |
| 1917 | -25.6 C (-14.1 F) |
| 1918 | -13.3 C (8.1 F) |
| 1919 | -25.0 C (-13.0 F) |
| 1920 | -25.6 C (-14.1 F) |
| 1921 | -16.1 C (3.0 F) |
| 1922 | -21.1 C (-6.0 F) |
| 1923 | -22.8 C (-9.0 F) |
| 1924 | -30.6 C (-23.1 F) |
| 1925 | -22.8 C (-9.0 F) |
| 1926 | -21.1 C (-6.0 F) |
| 1927 | -30.6 C (-23.1 F) |
| 1928 | -28.3 C (-18.9 F) |
| 1929 | -26.1 C (-15.0 F) |
| 1930 | -29.4 C (-20.9 F) |
| 1931 | -18.3 C (-0.9 F) |
| 1932 | -27.2 C (-17.0 F) |
| 1933 | -28.9 C (-20.0 F) |
| 1934 | -25.6 C (-14.1 F) |
| 1935 | -22.2 C (-8.0 F) |
| 1936 | -29.4 C (-20.9 F) |
| 1937 | -23.9 C (-11.0 F) |
| 1938 | -18.3 C (-0.9 F) |
| 1939 | -17.8 C (0.0 F) |
| 1940 | -25.6 C (-14.1 F) |
| 1941 | -20.0 C (-4.0 F) |
| 1942 | -24.4 C (-11.9 F) |
| 1943 | -25.6 C (-14.1 F) |
| 1944 | -22.8 C (-9.0 F) |
| 1945 | -22.8 C (-9.0 F) |
| 1946 | -19.4 C (-2.9 F) |
| 1947 | -20.6 C (-5.1 F) |
| 1948 | -22.2 C (-8.0 F) |
| 1949 | -20.0 C (-4.0 F) |
| 1950 | -22.8 C (-9.0 F) |
| 1951 | -26.1 C (-15.0 F) |
| 1952 | -20.0 C (-4.0 F) |
| 1953 | -19.4 C (-2.9 F) |
| 1954 | -21.7 C (-7.1 F) |
| 1955 | -23.9 C (-11.0 F) |
| 1956 | -17.2 C (1.0 F) |
| 1957 | -24.4 C (-11.9 F) |
| 1958 | -23.9 C (-11.0 F) |
| 1959 | -23.3 C (-9.9 F) |
| 1960 | -24.4 C (-11.9 F) |
| 1961 | -22.8 C (-9.0 F) |
| 1962 | -24.4 C (-11.9 F) |
| 1963 | -29.4 C (-20.9 F) |
| 1964 | -19.4 C (-2.9 F) |
| 1965 | -23.9 C (-11.0 F) |
| 1966 | -26.1 C (-15.0 F) |
| 1967 | -23.9 C (-11.0 F) |
| 1968 | -25.0 C (-13.0 F) |
| 1969 | -22.8 C (-9.0 F) |
| 1970 | -27.8 C (-18.0 F) |
| 1971 | -21.1 C (-6.0 F) |
| 1972 | -27.2 C (-17.0 F) |
| 1973 | -20.6 C (-5.1 F) |
| 1974 | -25.0 C (-13.0 F) |
| 1975 | -23.9 C (-11.0 F) |
| 1976 | -25.0 C (-13.0 F) |
| 1977 | -28.3 C (-18.9 F) |
| 1978 | -21.1 C (-6.0 F) |
| 1979 | -27.8 C (-18.0 F) |
| 1980 | -21.7 C (-7.1 F) |
| 1981 | -23.9 C (-11.0 F) |
| 1982 | -28.9 C (-20.0 F) |
| 1983 | -28.9 C (-20.0 F) |
| 1984 | -28.3 C (-18.9 F) |
| 1985 | -31.7 C (-25.1 F) |
| 1986 | -21.1 C (-6.0 F) |
| 1987 | -20.6 C (-5.1 F) |
| 1988 | -24.4 C (-11.9 F) |
| 1989 | -28.3 C (-18.9 F) |
| 1990 | -20.6 C (-5.1 F) |
| 1991 | -20.0 C (-4.0 F) |
| 1992 | -22.2 C (-8.0 F) |
| 1993 | -20.0 C (-4.0 F) |
| 1994 | -28.9 C (-20.0 F) |
| 1995 | -20.6 C (-5.1 F) |
| 1996 | -29.4 C (-20.9 F) |
| 1997 | -24.4 C (-11.9 F) |
| 1998 | -18.9 C (-2.0 F) |
| 1999 | -28.9 C (-20.0 F) |
| 2000 | -24.4 C (-11.9 F) |
| 2001 | -19.4 C (-2.9 F) |
| 2002 | -18.9 C (-2.0 F) |
| 2003 | -21.7 C (-7.1 F) |
| 2004 | -22.8 C (-9.0 F) |
| 2005 | -20.6 C (-5.1 F) |
| 2006 | -21.7 C (-7.1 F) |
| 2007 | -22.8 C (-9.0 F) |
| 2008 | -23.9 C (-11.0 F) |
| 2009 | -28.9 C (-20.0 F) |
| 2010 | -22.8 C (-9.0 F) |
| 2011 | -23.9 C (-11.0 F) |
| 2012 | -16.7 C (1.9 F) |
| 2013 | -20.6 C (-5.1 F) |
| 2014 | -27.2 C (-17.0 F) |
| 2015 | -23.3 C (-9.9 F) |
| 2016 | -23.3 C (-9.9 F) |
| 2017 | -22.8 C (-9.0 F) |
| 2018 | -27.2 C (-17.0 F) |
| 2019 | -32.2 C (-26.0 F) |
| 2020 | -21.7 C (-7.1 F) |
| 2021 | -24.4 C (-11.9 F) |
| 2022 | -23.3 C (-9.9 F) |
| 2023 | -18.9 C (-2.0 F) |
| 2024 | -25.0 C (-13.0 F) |
| 2025 | -22.8 C (-9.0 F) |
| 2026 | -22.2 C (-8.0 F) |
Wettest day (Rx1day)
| Year | Wettest day (Rx1day) |
|---|---|
| 1892 | 75.7 mm (3.0 in) |
| 1893 | 46.5 mm (1.8 in) |
| 1894 | 77.7 mm (3.1 in) |
| 1895 | 53.3 mm (2.1 in) |
| 1896 | 84.6 mm (3.3 in) |
| 1897 | 68.8 mm (2.7 in) |
| 1898 | 51.1 mm (2.0 in) |
| 1899 | 78.0 mm (3.1 in) |
| 1900 | 55.4 mm (2.2 in) |
| 1901 | 59.9 mm (2.4 in) |
| 1902 | 63.5 mm (2.5 in) |
| 1903 | 51.6 mm (2.0 in) |
| 1904 | 45.5 mm (1.8 in) |
| 1905 | 53.3 mm (2.1 in) |
| 1906 | 82.6 mm (3.3 in) |
| 1907 | 43.9 mm (1.7 in) |
| 1908 | 43.4 mm (1.7 in) |
| 1909 | 38.1 mm (1.5 in) |
| 1910 | 80.0 mm (3.1 in) |
| 1911 | 59.7 mm (2.4 in) |
| 1912 | 57.2 mm (2.3 in) |
| 1913 | 47.2 mm (1.9 in) |
| 1914 | 32.3 mm (1.3 in) |
| 1915 | 43.2 mm (1.7 in) |
| 1916 | 49.8 mm (2.0 in) |
| 1917 | 44.7 mm (1.8 in) |
| 1918 | 48.8 mm (1.9 in) |
| 1919 | 34.0 mm (1.3 in) |
| 1920 | 43.2 mm (1.7 in) |
| 1921 | 78.7 mm (3.1 in) |
| 1922 | 50.8 mm (2.0 in) |
| 1923 | 46.2 mm (1.8 in) |
| 1924 | 167.9 mm (6.6 in) |
| 1925 | 41.4 mm (1.6 in) |
| 1926 | 123.7 mm (4.9 in) |
| 1927 | 100.3 mm (3.9 in) |
| 1928 | 52.3 mm (2.1 in) |
| 1929 | 86.1 mm (3.4 in) |
| 1930 | 57.9 mm (2.3 in) |
| 1931 | 67.6 mm (2.7 in) |
| 1932 | 98.6 mm (3.9 in) |
| 1933 | 34.3 mm (1.4 in) |
| 1934 | 39.4 mm (1.6 in) |
| 1935 | 60.5 mm (2.4 in) |
| 1936 | 83.8 mm (3.3 in) |
| 1937 | 39.6 mm (1.6 in) |
| 1938 | 50.8 mm (2.0 in) |
| 1939 | 51.8 mm (2.0 in) |
| 1940 | 36.8 mm (1.4 in) |
| 1941 | 64.8 mm (2.6 in) |
| 1942 | 89.7 mm (3.5 in) |
| 1943 | 58.9 mm (2.3 in) |
| 1944 | 45.5 mm (1.8 in) |
| 1945 | 43.4 mm (1.7 in) |
| 1946 | 47.2 mm (1.9 in) |
| 1947 | 58.9 mm (2.3 in) |
| 1948 | 92.7 mm (3.6 in) |
| 1949 | 79.8 mm (3.1 in) |
| 1950 | 71.4 mm (2.8 in) |
| 1951 | 76.7 mm (3.0 in) |
| 1952 | 34.3 mm (1.4 in) |
| 1953 | 39.9 mm (1.6 in) |
| 1954 | 55.6 mm (2.2 in) |
| 1955 | 73.9 mm (2.9 in) |
| 1956 | 49.0 mm (1.9 in) |
| 1957 | 39.9 mm (1.6 in) |
| 1958 | 222.8 mm (8.8 in) |
| 1959 | 44.5 mm (1.8 in) |
| 1960 | 43.4 mm (1.7 in) |
| 1961 | 64.0 mm (2.5 in) |
| 1962 | 34.3 mm (1.4 in) |
| 1963 | 40.4 mm (1.6 in) |
| 1964 | 44.5 mm (1.8 in) |
| 1965 | 70.9 mm (2.8 in) |
| 1966 | 63.8 mm (2.5 in) |
| 1967 | 47.2 mm (1.9 in) |
| 1968 | 69.1 mm (2.7 in) |
| 1969 | 57.2 mm (2.3 in) |
| 1970 | 62.5 mm (2.5 in) |
| 1971 | 48.3 mm (1.9 in) |
| 1972 | 75.4 mm (3.0 in) |
| 1973 | 42.7 mm (1.7 in) |
| 1974 | 81.3 mm (3.2 in) |
| 1975 | 80.8 mm (3.2 in) |
| 1976 | 46.5 mm (1.8 in) |
| 1977 | 109.2 mm (4.3 in) |
| 1978 | 62.5 mm (2.5 in) |
| 1979 | 82.3 mm (3.2 in) |
| 1980 | 67.3 mm (2.6 in) |
| 1981 | 68.3 mm (2.7 in) |
| 1982 | 91.7 mm (3.6 in) |
| 1983 | 61.0 mm (2.4 in) |
| 1984 | 55.4 mm (2.2 in) |
| 1985 | 63.0 mm (2.5 in) |
| 1986 | 63.0 mm (2.5 in) |
| 1987 | 94.7 mm (3.7 in) |
| 1988 | 43.7 mm (1.7 in) |
| 1989 | 73.9 mm (2.9 in) |
| 1990 | 64.5 mm (2.5 in) |
| 1991 | 52.6 mm (2.1 in) |
| 1992 | 71.6 mm (2.8 in) |
| 1993 | 47.8 mm (1.9 in) |
| 1994 | 51.8 mm (2.0 in) |
| 1995 | 52.3 mm (2.1 in) |
| 1996 | 88.9 mm (3.5 in) |
| 1997 | 72.4 mm (2.9 in) |
| 1998 | 54.6 mm (2.1 in) |
| 1999 | 59.7 mm (2.4 in) |
| 2000 | 57.2 mm (2.3 in) |
| 2001 | 63.0 mm (2.5 in) |
| 2002 | 78.7 mm (3.1 in) |
| 2003 | 36.8 mm (1.4 in) |
| 2004 | 46.5 mm (1.8 in) |
| 2005 | 50.8 mm (2.0 in) |
| 2006 | 50.8 mm (2.0 in) |
| 2007 | 118.1 mm (4.6 in) |
| 2008 | 59.4 mm (2.3 in) |
| 2009 | 54.9 mm (2.2 in) |
| 2010 | 46.0 mm (1.8 in) |
| 2011 | 59.4 mm (2.3 in) |
| 2012 | 37.6 mm (1.5 in) |
| 2013 | 50.8 mm (2.0 in) |
| 2014 | 76.2 mm (3.0 in) |
| 2015 | 57.2 mm (2.3 in) |
| 2016 | 45.7 mm (1.8 in) |
| 2017 | 114.3 mm (4.5 in) |
| 2018 | 73.9 mm (2.9 in) |
| 2019 | 111.8 mm (4.4 in) |
| 2020 | 45.2 mm (1.8 in) |
| 2021 | 85.1 mm (3.4 in) |
| 2022 | 40.6 mm (1.6 in) |
| 2023 | 63.5 mm (2.5 in) |
| 2024 | 71.1 mm (2.8 in) |
| 2025 | 44.5 mm (1.8 in) |
| 2026 | 53.3 mm (2.1 in) |
Wettest five days (Rx5day)
| Year | Wettest five days (Rx5day) |
|---|---|
| 1892 | 208.2 mm (8.2 in) |
| 1893 | 76.7 mm (3.0 in) |
| 1894 | 115.2 mm (4.5 in) |
| 1895 | 127.2 mm (5.0 in) |
| 1896 | 112.9 mm (4.4 in) |
| 1897 | 97.8 mm (3.9 in) |
| 1898 | 93.2 mm (3.7 in) |
| 1899 | 113.6 mm (4.5 in) |
| 1900 | 103.7 mm (4.1 in) |
| 1901 | 118.5 mm (4.7 in) |
| 1902 | 158.5 mm (6.2 in) |
| 1903 | 86.6 mm (3.4 in) |
| 1904 | 82.3 mm (3.2 in) |
| 1905 | 68.1 mm (2.7 in) |
| 1906 | 97.8 mm (3.9 in) |
| 1907 | 91.7 mm (3.6 in) |
| 1908 | 96.4 mm (3.8 in) |
| 1909 | 53.1 mm (2.1 in) |
| 1910 | 99.4 mm (3.9 in) |
| 1911 | 82.5 mm (3.2 in) |
| 1912 | 112.6 mm (4.4 in) |
| 1913 | 78.4 mm (3.1 in) |
| 1914 | 60.9 mm (2.4 in) |
| 1915 | 75.2 mm (3.0 in) |
| 1916 | 79.3 mm (3.1 in) |
| 1917 | 50.3 mm (2.0 in) |
| 1918 | 77.2 mm (3.0 in) |
| 1919 | 65.8 mm (2.6 in) |
| 1920 | 80.8 mm (3.2 in) |
| 1921 | 122.9 mm (4.8 in) |
| 1922 | 78.7 mm (3.1 in) |
| 1923 | 71.9 mm (2.8 in) |
| 1924 | 232.9 mm (9.2 in) |
| 1925 | 66.1 mm (2.6 in) |
| 1926 | 164.1 mm (6.5 in) |
| 1927 | 128.5 mm (5.1 in) |
| 1928 | 83.8 mm (3.3 in) |
| 1929 | 93.0 mm (3.7 in) |
| 1930 | 60.7 mm (2.4 in) |
| 1931 | 82.1 mm (3.2 in) |
| 1932 | 121.9 mm (4.8 in) |
| 1933 | 62.5 mm (2.5 in) |
| 1934 | 70.7 mm (2.8 in) |
| 1935 | 100.6 mm (4.0 in) |
| 1936 | 115.8 mm (4.6 in) |
| 1937 | 68.3 mm (2.7 in) |
| 1938 | 79.3 mm (3.1 in) |
| 1939 | 79.7 mm (3.1 in) |
| 1940 | 58.9 mm (2.3 in) |
| 1941 | 128.3 mm (5.1 in) |
| 1942 | 97.6 mm (3.8 in) |
| 1943 | 90.4 mm (3.6 in) |
| 1944 | 86.6 mm (3.4 in) |
| 1945 | 85.9 mm (3.4 in) |
| 1946 | 65.5 mm (2.6 in) |
| 1947 | 71.4 mm (2.8 in) |
| 1948 | 113.3 mm (4.5 in) |
| 1949 | 83.0 mm (3.3 in) |
| 1950 | 136.0 mm (5.4 in) |
| 1951 | 101.1 mm (4.0 in) |
| 1952 | 71.1 mm (2.8 in) |
| 1953 | 59.7 mm (2.4 in) |
| 1954 | 87.4 mm (3.4 in) |
| 1955 | 87.6 mm (3.4 in) |
| 1956 | 93.7 mm (3.7 in) |
| 1957 | 78.0 mm (3.1 in) |
| 1958 | 238.2 mm (9.4 in) |
| 1959 | 92.9 mm (3.7 in) |
| 1960 | 74.7 mm (2.9 in) |
| 1961 | 109.5 mm (4.3 in) |
| 1962 | 74.2 mm (2.9 in) |
| 1963 | 67.5 mm (2.7 in) |
| 1964 | 76.7 mm (3.0 in) |
| 1965 | 122.9 mm (4.8 in) |
| 1966 | 114.9 mm (4.5 in) |
| 1967 | 68.6 mm (2.7 in) |
| 1968 | 128.8 mm (5.1 in) |
| 1969 | 87.2 mm (3.4 in) |
| 1970 | 142.9 mm (5.6 in) |
| 1971 | 57.2 mm (2.3 in) |
| 1972 | 114.9 mm (4.5 in) |
| 1973 | 68.1 mm (2.7 in) |
| 1974 | 116.6 mm (4.6 in) |
| 1975 | 140.3 mm (5.5 in) |
| 1976 | 99.4 mm (3.9 in) |
| 1977 | 118.1 mm (4.6 in) |
| 1978 | 117.9 mm (4.6 in) |
| 1979 | 162.3 mm (6.4 in) |
| 1980 | 127.2 mm (5.0 in) |
| 1981 | 119.4 mm (4.7 in) |
| 1982 | 97.0 mm (3.8 in) |
| 1983 | 108.0 mm (4.3 in) |
| 1984 | 88.7 mm (3.5 in) |
| 1985 | 108.2 mm (4.3 in) |
| 1986 | 117.8 mm (4.6 in) |
| 1987 | 133.2 mm (5.2 in) |
| 1988 | 48.9 mm (1.9 in) |
| 1989 | 127.5 mm (5.0 in) |
| 1990 | 95.3 mm (3.8 in) |
| 1991 | 98.1 mm (3.9 in) |
| 1992 | 90.6 mm (3.6 in) |
| 1993 | 68.9 mm (2.7 in) |
| 1994 | 74.7 mm (2.9 in) |
| 1995 | 102.2 mm (4.0 in) |
| 1996 | 132.9 mm (5.2 in) |
| 1997 | 82.1 mm (3.2 in) |
| 1998 | 103.6 mm (4.1 in) |
| 1999 | 78.0 mm (3.1 in) |
| 2000 | 78.2 mm (3.1 in) |
| 2001 | 81.7 mm (3.2 in) |
| 2002 | 98.0 mm (3.9 in) |
| 2003 | 100.6 mm (4.0 in) |
| 2004 | 81.5 mm (3.2 in) |
| 2005 | 66.2 mm (2.6 in) |
| 2006 | 75.7 mm (3.0 in) |
| 2007 | 256.1 mm (10.1 in) |
| 2008 | 105.1 mm (4.1 in) |
| 2009 | 108.3 mm (4.3 in) |
| 2010 | 76.4 mm (3.0 in) |
| 2011 | 115.1 mm (4.5 in) |
| 2012 | 74.2 mm (2.9 in) |
| 2013 | 62.7 mm (2.5 in) |
| 2014 | 126.5 mm (5.0 in) |
| 2015 | 102.4 mm (4.0 in) |
| 2016 | 60.9 mm (2.4 in) |
| 2017 | 129.6 mm (5.1 in) |
| 2018 | 97.1 mm (3.8 in) |
| 2019 | 123.3 mm (4.9 in) |
| 2020 | 105.0 mm (4.1 in) |
| 2021 | 102.7 mm (4.0 in) |
| 2022 | 53.6 mm (2.1 in) |
| 2023 | 80.8 mm (3.2 in) |
| 2024 | 95.0 mm (3.7 in) |
| 2025 | 66.2 mm (2.6 in) |
| 2026 | 124.2 mm (4.9 in) |
Longest dry spell (CDD)
| Year | Longest dry spell (CDD) |
|---|---|
| 1892 | 18 days |
| 1893 | 26 days |
| 1894 | 26 days |
| 1895 | 27 days |
| 1896 | 19 days |
| 1897 | 22 days |
| 1898 | 24 days |
| 1899 | 18 days |
| 1900 | 16 days |
| 1901 | 20 days |
| 1902 | 19 days |
| 1903 | 26 days |
| 1904 | 31 days |
| 1905 | 18 days |
| 1906 | 21 days |
| 1907 | 21 days |
| 1908 | 37 days |
| 1909 | 21 days |
| 1910 | 22 days |
| 1911 | 26 days |
| 1912 | 26 days |
| 1913 | 20 days |
| 1914 | 24 days |
| 1915 | 30 days |
| 1916 | 25 days |
| 1917 | 20 days |
| 1918 | 18 days |
| 1919 | 35 days |
| 1920 | 21 days |
| 1921 | 13 days |
| 1922 | 17 days |
| 1923 | 22 days |
| 1924 | 23 days |
| 1925 | 26 days |
| 1926 | 12 days |
| 1927 | 18 days |
| 1928 | 19 days |
| 1929 | 16 days |
| 1930 | 30 days |
| 1931 | 18 days |
| 1932 | 17 days |
| 1933 | 32 days |
| 1934 | 20 days |
| 1935 | 16 days |
| 1936 | 22 days |
| 1937 | 26 days |
| 1938 | 22 days |
| 1939 | 29 days |
| 1940 | 17 days |
| 1941 | 20 days |
| 1942 | 27 days |
| 1943 | 19 days |
| 1944 | 33 days |
| 1945 | 27 days |
| 1946 | 23 days |
| 1947 | 21 days |
| 1948 | 21 days |
| 1949 | 20 days |
| 1950 | 31 days |
| 1951 | 16 days |
| 1952 | 33 days |
| 1953 | 23 days |
| 1954 | 24 days |
| 1955 | 24 days |
| 1956 | 25 days |
| 1957 | 29 days |
| 1958 | 19 days |
| 1959 | 19 days |
| 1960 | 25 days |
| 1961 | 17 days |
| 1962 | 20 days |
| 1963 | 19 days |
| 1964 | 35 days |
| 1965 | 20 days |
| 1966 | 25 days |
| 1967 | 23 days |
| 1968 | 29 days |
| 1969 | 39 days |
| 1970 | 11 days |
| 1971 | 24 days |
| 1972 | 13 days |
| 1973 | 15 days |
| 1974 | 15 days |
| 1975 | 14 days |
| 1976 | 27 days |
| 1977 | 18 days |
| 1978 | 19 days |
| 1979 | 25 days |
| 1980 | 16 days |
| 1981 | 26 days |
| 1982 | 18 days |
| 1983 | 20 days |
| 1984 | 21 days |
| 1985 | 14 days |
| 1986 | 22 days |
| 1987 | 29 days |
| 1988 | 31 days |
| 1989 | 24 days |
| 1990 | 16 days |
| 1991 | 32 days |
| 1992 | 16 days |
| 1993 | 21 days |
| 1994 | 23 days |
| 1995 | 29 days |
| 1996 | 19 days |
| 1997 | 18 days |
| 1998 | 23 days |
| 1999 | 32 days |
| 2000 | 18 days |
| 2001 | 19 days |
| 2002 | 24 days |
| 2003 | 17 days |
| 2004 | 23 days |
| 2005 | 21 days |
| 2006 | 18 days |
| 2007 | 35 days |
| 2008 | 14 days |
| 2009 | 27 days |
| 2010 | 21 days |
| 2011 | 12 days |
| 2012 | 18 days |
| 2013 | 26 days |
| 2014 | 21 days |
| 2015 | 21 days |
| 2016 | 19 days |
| 2017 | 37 days |
| 2018 | 17 days |
| 2019 | 13 days |
| 2020 | 21 days |
| 2021 | 12 days |
| 2022 | 16 days |
| 2023 | 23 days |
| 2024 | 25 days |
| 2025 | 19 days |
| 2026 | 25 days |
Each chart shows one value per year; the dot marks the record year. TXx is the hottest daily maximum, TNn the coldest daily minimum, Rx1day and Rx5day the largest one-day and five-day rain totals, and CDD the longest run of days with less than 1 mm of rain. A year with missing days can understate an extreme.
Frost Dates and Growing Season
119 years with a frostAcross 119 years with a frost, the median last spring frost at Ottawa 4SW falls on 23 April and the median first autumn frost on 17 October, which leaves a median of 176 days between them.
In 1993 to 2025 the median growing season was 182 days. That is 11 days more than in 1893 to 1932.
Fitted over all years, the growing season changes by +1.6 days per decade at this station.
| Measure | Median, all years | Earliest period (1893 to 1932) | Recent period (1993 to 2025) | Recent against earliest | Fitted trend |
|---|---|---|---|---|---|
| Last spring frost | 23 April | 25 April | 21 April | 4 days earlier | -0.8 days per decade |
| First autumn frost | 17 October | 10 October | 18 October | 8 days later | +0.8 days per decade |
| Growing days | 176 days | 171 days | 182 days | 11 days more | +1.6 days per decade |
A frost day is a day with a daily minimum at or below 0 C (32 F). The last spring frost and the first autumn frost are the last and first such days of the cold season, and growing days are the days between them. A negative trend for the last spring frost means it comes earlier.
Rainfall Return Levels
125 years, 1893 to 2025A day with at least 56.8 mm (2.2 in) of rain is expected about once in 2 years. A day with at least 154.6 mm (6.1 in) of rain is expected about once in 100 years.
| Expected about once in | A day with at least | Note |
|---|---|---|
| 2 years | 56.8 mm (2.2 in) | |
| 5 years | 76.0 mm (3.0 in) | |
| 10 years | 91.1 mm (3.6 in) | |
| 25 years | 113.4 mm (4.5 in) | |
| 50 years | 132.8 mm (5.2 in) | |
| 100 years | 154.6 mm (6.1 in) |
The levels come from a generalised extreme value (GEV) distribution fitted by L-moments to the wettest-day total of each year, 125 years of values from 1893 to 2025.
A return level is an estimate. It is least reliable for the long periods, 50 and 100 years, and for any period longer than the record behind the fit, where the fit has to reach past the largest day actually observed. It is not a forecast.
The largest wettest-day totals in the fit: 222.8 mm (8.8 in) in 1958; 167.9 mm (6.6 in) in 1924; 123.7 mm (4.9 in) in 1926.
Station Changes
No change in the annual mean temperature of this station was found against its neighbours.
Climate Twins
2010 to 2025 against 1961 to 1990Over 2010 to 2025, Ottawa 4SW had a mean temperature of 10.5 C (50.8 F) and 915.4 mm (36.0 in) of rain a year. The 3 stations whose 1961 to 1990 climate was closest to that are Kentland (United States, 139 km away), Rantoul (United States, 129 km away) and Huntington (United States, 290 km away).
| Twin station | Country | Distance away | Mean temperature, 1961-1990 | Rain a year, 1961-1990 | Climate difference |
|---|---|---|---|---|---|
| Kentland | United States | 139 km (86 mi) | 10.6 C (51.0 F) | 943.9 mm (37.2 in) | 0.58 |
| Rantoul | United States | 129 km (80 mi) | 10.7 C (51.2 F) | 920.8 mm (36.3 in) | 0.58 |
| Huntington | United States | 290 km (180 mi) | 10.3 C (50.6 F) | 929.4 mm (36.6 in) | 0.60 |
Twins are stations, not cities. A twin is one of the three stations at least 100 km away whose earlier climate is closest to this station's recent one, so a close match does not mean the two places look alike in other ways. A station move or a gap in a record can change that station's averages. The list describes past climate; it is not a forecast and does not say what caused any change. How twins are found, and a search for any station.
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 2026-10-15 (15 October 2026). Records are computed by this site and are not official.
Data as of . Last revised (2026-10-16).