Boulder Weather Records (USC00050848)
Record envelope, standing records and threshold days for Boulder (USC00050848), Colorado, United States, with 134 years of record.
Key Facts for Boulder
- Boulder (USC00050848) is a weather station in Colorado, United States at 39.99 latitude and -105.27 longitude, 1,673 m (5,489 ft) above sea level.
- The station reports from 1893 to 2026, 134 years of record.
- 1,464 records set at Boulder still stand.
- Records are tracked for tmax, tmin, prcp, snow, snwd: an element needs 30 years of data to be eligible.
- Boulder tied a daily record high maximum temperature of 30.0 C (86.0 F) on 9 October 2026 (provisional).
Provisional Records
Records set in the last 60 days are provisional until they clear the revision window.
About the Station
- Location: Colorado, United States, 39.99 latitude, -105.27 longitude.
- Elevation: 1,673 m (5,489 ft).
- Period of record: 1893 to 2026, 134 years.
- Eligible elements: tmax, tmin, prcp, snow, snwd.
Daily Record Envelope and 2026
32 days at or beyond a record| Month | Highest record high | Lowest record low | 2026 highest maximum | 2026 lowest minimum |
|---|---|---|---|---|
| Jan | 22.8 C (73.0 F) | -36.1 C (-33.0 F) | 21.1 C (70.0 F) | -21.1 C (-6.0 F) |
| Feb | 26.1 C (79.0 F) | -33.3 C (-27.9 F) | 22.2 C (72.0 F) | -12.2 C (10.0 F) |
| Mar | 31.7 C (89.1 F) | -25.0 C (-13.0 F) | 31.7 C (89.1 F) | -8.3 C (17.1 F) |
| Apr | 31.1 C (88.0 F) | -19.4 C (-2.9 F) | 28.9 C (84.0 F) | -3.9 C (25.0 F) |
| May | 35.0 C (95.0 F) | -8.3 C (17.1 F) | 31.1 C (88.0 F) | -2.2 C (28.0 F) |
| Jun | 40.0 C (104.0 F) | -6.7 C (19.9 F) | 34.4 C (93.9 F) | 7.2 C (45.0 F) |
| Jul | 40.0 C (104.0 F) | 4.4 C (39.9 F) | 38.9 C (102.0 F) | 11.7 C (53.1 F) |
| Aug | 40.0 C (104.0 F) | 4.4 C (39.9 F) | 40.0 C (104.0 F) | 7.8 C (46.0 F) |
| Sep | 37.8 C (100.0 F) | -9.4 C (15.1 F) | 35.0 C (95.0 F) | 7.8 C (46.0 F) |
| Oct | 32.2 C (90.0 F) | -18.9 C (-2.0 F) | 31.7 C (89.1 F) | 6.1 C (43.0 F) |
| Nov | 27.2 C (81.0 F) | -24.4 C (-11.9 F) | n/a | n/a |
| Dec | 24.4 C (75.9 F) | -31.1 C (-24.0 F) | n/a | n/a |
Which Years Hold Standing Records
1,464 standing records| Year set | Standing records |
|---|---|
| 1893 | 1 |
| 1894 | 5 |
| 1895 | 11 |
| 1897 | 10 |
| 1898 | 17 |
| 1899 | 15 |
| 1900 | 13 |
| 1901 | 10 |
| 1902 | 17 |
| 1903 | 19 |
| 1904 | 12 |
| 1905 | 6 |
| 1906 | 17 |
| 1907 | 13 |
| 1908 | 16 |
| 1909 | 10 |
| 1910 | 13 |
| 1911 | 12 |
| 1912 | 5 |
| 1913 | 6 |
| 1914 | 6 |
| 1915 | 13 |
| 1916 | 16 |
| 1917 | 15 |
| 1918 | 10 |
| 1919 | 27 |
| 1920 | 6 |
| 1921 | 4 |
| 1922 | 8 |
| 1923 | 5 |
| 1924 | 19 |
| 1925 | 13 |
| 1926 | 15 |
| 1927 | 9 |
| 1928 | 2 |
| 1929 | 8 |
| 1930 | 12 |
| 1931 | 11 |
| 1932 | 22 |
| 1933 | 16 |
| 1934 | 9 |
| 1935 | 27 |
| 1936 | 10 |
| 1937 | 8 |
| 1938 | 8 |
| 1939 | 13 |
| 1940 | 8 |
| 1941 | 3 |
| 1942 | 4 |
| 1943 | 12 |
| 1944 | 4 |
| 1945 | 10 |
| 1946 | 7 |
| 1947 | 21 |
| 1948 | 14 |
| 1949 | 12 |
| 1950 | 19 |
| 1951 | 15 |
| 1952 | 15 |
| 1953 | 20 |
| 1954 | 31 |
| 1955 | 9 |
| 1956 | 9 |
| 1957 | 7 |
| 1958 | 7 |
| 1959 | 10 |
| 1960 | 8 |
| 1961 | 8 |
| 1962 | 19 |
| 1963 | 17 |
| 1964 | 6 |
| 1965 | 19 |
| 1966 | 7 |
| 1967 | 15 |
| 1968 | 4 |
| 1969 | 13 |
| 1970 | 6 |
| 1971 | 6 |
| 1972 | 14 |
| 1973 | 10 |
| 1974 | 9 |
| 1975 | 8 |
| 1976 | 2 |
| 1977 | 4 |
| 1978 | 3 |
| 1979 | 7 |
| 1980 | 13 |
| 1981 | 13 |
| 1982 | 5 |
| 1983 | 14 |
| 1984 | 6 |
| 1985 | 15 |
| 1986 | 10 |
| 1987 | 10 |
| 1988 | 7 |
| 1989 | 14 |
| 1990 | 19 |
| 1991 | 10 |
| 1992 | 8 |
| 1993 | 8 |
| 1994 | 4 |
| 1995 | 14 |
| 1996 | 10 |
| 1997 | 13 |
| 1998 | 3 |
| 1999 | 5 |
| 2000 | 13 |
| 2001 | 3 |
| 2002 | 12 |
| 2003 | 10 |
| 2004 | 10 |
| 2005 | 6 |
| 2006 | 21 |
| 2007 | 5 |
| 2008 | 11 |
| 2009 | 12 |
| 2010 | 7 |
| 2011 | 5 |
| 2012 | 13 |
| 2013 | 6 |
| 2014 | 13 |
| 2015 | 7 |
| 2016 | 10 |
| 2017 | 12 |
| 2018 | 8 |
| 2019 | 16 |
| 2020 | 15 |
| 2021 | 16 |
| 2022 | 9 |
| 2023 | 8 |
| 2024 | 8 |
| 2025 | 16 |
| 2026 | 29 |
All-Time Record Progression
12 new records| Date | Kind | Detail |
|---|---|---|
| 1930-01-17 | Record low minimum temperature | Record low minimum temperature -36.1 C (-33.0 F) |
| 1931-07-22 | Record high maximum temperature | Record high maximum temperature 38.9 C (102.0 F) |
| 1932-12-09 | Record low maximum temperature | Record low maximum temperature -18.9 C (-2.0 F) |
| 1933-02-07 | Record low maximum temperature | Record low maximum temperature -19.4 C (-2.9 F) |
| 1933-02-09 | Record low maximum temperature | Record low maximum temperature -20.6 C (-5.1 F) |
| 1954-06-23 | Record high maximum temperature | Record high maximum temperature 40.0 C (104.0 F) |
| 1954-06-24 | Record high minimum temperature | Record high minimum temperature 26.7 C (80.1 F) |
| 1957-04-02 | Record daily snowfall | Record daily snowfall 52.3 cm (20.6 in) |
| 1979-11-20 | Record daily snowfall | Record daily snowfall 55.9 cm (22.0 in) |
| 1989-02-04 | Record low maximum temperature | Record low maximum temperature -24.4 C (-11.9 F) |
| 1997-10-25 | Record daily snowfall | Record daily snowfall 56.1 cm (22.1 in) |
| 2013-09-12 | Record daily precipitation | Record daily precipitation 230.6 mm (9.1 in) |
Wettest Day of Each Month
Sep: 230.6 mm (9.1 in)| Month | Record daily precipitation (mm) | Date |
|---|---|---|
| Jan | 26.4 mm (1.0 in) | 6 January 1998 |
| Feb | 40.1 mm (1.6 in) | 3 February 2024 |
| Mar | 67.8 mm (2.7 in) | 24 March 1909 |
| Apr | 90.4 mm (3.6 in) | 3 April 1986 |
| May | 89.2 mm (3.5 in) | 17 May 1995 |
| Jun | 86.4 mm (3.4 in) | 4 June 1949 |
| Jul | 121.9 mm (4.8 in) | 31 July 1919 |
| Aug | 77.7 mm (3.1 in) | 3 August 1951 |
| Sep | 230.6 mm (9.1 in) | 12 September 2013 |
| Oct | 63.5 mm (2.5 in) | 15 October 1916 |
| Nov | 33.8 mm (1.3 in) | 26 November 2019 |
| Dec | 37.3 mm (1.5 in) | 5 December 1913 |
Period of Record Coverage
1893 to 2026| Year | Days with data | Share of year | Complete |
|---|---|---|---|
| 1893 | 89 | 24% | No |
| 1894 | 192 | 53% | No |
| 1895 | 181 | 50% | No |
| 1897 | 232 | 64% | No |
| 1898 | 358 | 98% | Yes |
| 1899 | 365 | 100% | Yes |
| 1900 | 364 | 100% | Yes |
| 1901 | 362 | 99% | Yes |
| 1902 | 362 | 99% | Yes |
| 1903 | 356 | 98% | Yes |
| 1904 | 363 | 99% | Yes |
| 1905 | 358 | 98% | Yes |
| 1906 | 364 | 100% | Yes |
| 1907 | 355 | 97% | Yes |
| 1908 | 362 | 99% | Yes |
| 1909 | 361 | 99% | Yes |
| 1910 | 298 | 82% | No |
| 1911 | 330 | 90% | Yes |
| 1912 | 284 | 78% | No |
| 1913 | 354 | 97% | Yes |
| 1914 | 336 | 92% | Yes |
| 1915 | 360 | 99% | Yes |
| 1916 | 359 | 98% | Yes |
| 1917 | 363 | 99% | Yes |
| 1918 | 363 | 99% | Yes |
| 1919 | 332 | 91% | Yes |
| 1920 | 357 | 98% | Yes |
| 1921 | 362 | 99% | Yes |
| 1922 | 361 | 99% | Yes |
| 1923 | 364 | 100% | Yes |
| 1924 | 361 | 99% | Yes |
| 1925 | 356 | 98% | Yes |
| 1926 | 358 | 98% | Yes |
| 1927 | 363 | 99% | Yes |
| 1928 | 364 | 99% | Yes |
| 1929 | 364 | 100% | Yes |
| 1930 | 363 | 99% | Yes |
| 1931 | 363 | 99% | Yes |
| 1932 | 366 | 100% | Yes |
| 1933 | 364 | 100% | Yes |
| 1934 | 360 | 99% | Yes |
| 1935 | 365 | 100% | Yes |
| 1936 | 336 | 92% | Yes |
| 1937 | 365 | 100% | Yes |
| 1938 | 363 | 99% | Yes |
| 1939 | 361 | 99% | Yes |
| 1940 | 357 | 98% | Yes |
| 1941 | 356 | 98% | Yes |
| 1942 | 352 | 96% | Yes |
| 1943 | 358 | 98% | Yes |
| 1944 | 359 | 98% | Yes |
| 1945 | 347 | 95% | Yes |
| 1946 | 340 | 93% | Yes |
| 1947 | 324 | 89% | No |
| 1948 | 344 | 94% | Yes |
| 1949 | 364 | 100% | Yes |
| 1950 | 364 | 100% | Yes |
| 1951 | 363 | 99% | Yes |
| 1952 | 365 | 100% | Yes |
| 1953 | 364 | 100% | Yes |
| 1954 | 361 | 99% | Yes |
| 1955 | 363 | 99% | Yes |
| 1956 | 366 | 100% | Yes |
| 1957 | 365 | 100% | Yes |
| 1958 | 365 | 100% | Yes |
| 1959 | 365 | 100% | Yes |
| 1960 | 366 | 100% | Yes |
| 1961 | 365 | 100% | Yes |
| 1962 | 365 | 100% | Yes |
| 1963 | 364 | 100% | Yes |
| 1964 | 365 | 100% | Yes |
| 1965 | 364 | 100% | Yes |
| 1966 | 362 | 99% | Yes |
| 1967 | 365 | 100% | Yes |
| 1968 | 366 | 100% | Yes |
| 1969 | 364 | 100% | Yes |
| 1970 | 361 | 99% | Yes |
| 1971 | 364 | 100% | Yes |
| 1972 | 366 | 100% | Yes |
| 1973 | 365 | 100% | Yes |
| 1974 | 365 | 100% | Yes |
| 1975 | 365 | 100% | Yes |
| 1976 | 366 | 100% | Yes |
| 1977 | 364 | 100% | Yes |
| 1978 | 329 | 90% | Yes |
| 1979 | 270 | 74% | No |
| 1980 | 366 | 100% | Yes |
| 1981 | 365 | 100% | Yes |
| 1982 | 332 | 91% | Yes |
| 1983 | 297 | 81% | No |
| 1984 | 360 | 98% | Yes |
| 1985 | 335 | 92% | Yes |
| 1986 | 364 | 100% | Yes |
| 1987 | 364 | 100% | Yes |
| 1988 | 366 | 100% | Yes |
| 1989 | 212 | 58% | No |
| 1990 | 274 | 75% | No |
| 1991 | 364 | 100% | Yes |
| 1992 | 363 | 99% | Yes |
| 1993 | 333 | 91% | Yes |
| 1994 | 362 | 99% | Yes |
| 1995 | 364 | 100% | Yes |
| 1996 | 364 | 99% | Yes |
| 1997 | 364 | 100% | Yes |
| 1998 | 365 | 100% | Yes |
| 1999 | 364 | 100% | Yes |
| 2000 | 355 | 97% | Yes |
| 2001 | 362 | 99% | Yes |
| 2002 | 364 | 100% | Yes |
| 2003 | 365 | 100% | Yes |
| 2004 | 364 | 99% | Yes |
| 2005 | 364 | 100% | Yes |
| 2006 | 365 | 100% | Yes |
| 2007 | 365 | 100% | Yes |
| 2008 | 365 | 100% | Yes |
| 2009 | 334 | 92% | Yes |
| 2010 | 365 | 100% | Yes |
| 2011 | 364 | 100% | Yes |
| 2012 | 366 | 100% | Yes |
| 2013 | 365 | 100% | Yes |
| 2014 | 365 | 100% | Yes |
| 2015 | 365 | 100% | Yes |
| 2016 | 366 | 100% | Yes |
| 2017 | 334 | 92% | Yes |
| 2018 | 365 | 100% | Yes |
| 2019 | 365 | 100% | Yes |
| 2020 | 366 | 100% | Yes |
| 2021 | 365 | 100% | Yes |
| 2022 | 365 | 100% | Yes |
| 2023 | 365 | 100% | Yes |
| 2024 | 366 | 100% | Yes |
| 2025 | 365 | 100% | Yes |
| 2026 | 282 | 77% | No |
Latest Records
20| Date | Station | Record | Value | Beat old record by | Old record stood | Significance |
|---|---|---|---|---|---|---|
| 9 October 2026 | Boulder, US | daily high max (Tie, Provisional) | 30.0 C (86.0 F) | tie | 116 years | 10 of 100 (Routine) |
| 8 October 2026 | Boulder, US | daily high max (Tie, Provisional) | 30.0 C (86.0 F) | tie | 47 years | 6 of 100 (Routine) |
| 6 October 2026 | Boulder, US | daily high max (Provisional) | 31.7 C (89.1 F) | 1.7 C (3.1 F) | 5 years | 13 of 100 (Routine) |
| 14 September 2026 | Boulder, US | daily high min (Provisional) | 18.9 C (66.0 F) | 1.7 C (3.1 F) | 71 years | 34 of 100 (Routine) |
| 13 September 2026 | Boulder, US | daily high max (Tie, Provisional) | 35.0 C (95.0 F) | tie | 36 years | 5 of 100 (Routine) |
| 28 August 2026 | Boulder, US | daily high max (Provisional) | 36.1 C (97.0 F) | 0.5 C (0.9 F) | 77 years | 34 of 100 (Routine) |
| 23 August 2026 | Boulder, US | daily high max (Tie, Provisional) | 36.7 C (98.1 F) | tie | 15 years | 3 of 100 (Routine) |
| 21 August 2026 | Boulder, US | daily high max (Provisional) | 38.3 C (100.9 F) | 1.6 C (2.9 F) | 3 years | 14 of 100 (Routine) |
| 10 August 2026 | Boulder, US | daily high max (Tie) | 36.1 C (97.0 F) | tie | 56 years | 6 of 100 (Routine) |
| 8 August 2026 | Boulder, US | daily high max (Tie) | 38.3 C (100.9 F) | tie | 56 years | 6 of 100 (Routine) |
| 6 August 2026 | Boulder, US | daily low min | 8.9 C (48.0 F) | 1.1 C (2.0 F) | 115 years | 43 of 100 (Notable) |
| 5 August 2026 | Boulder, US | daily low min | 7.8 C (46.0 F) | 0.5 C (0.9 F) | 115 years | 41 of 100 (Notable) |
| 3 August 2026 | Boulder, US | all-time high max (Tie) | 40.0 C (104.0 F) | tie | 72 years | 12 of 100 (Routine) |
| 2 August 2026 | Boulder, US | daily high max | 38.3 C (100.9 F) | 1.1 C (2.0 F) | 17 years | 18 of 100 (Routine) |
| 27 July 2026 | Boulder, US | daily high min | 23.9 C (75.0 F) | 2.8 C (5.0 F) | 127 years | 49 of 100 (Notable) |
| 26 July 2026 | Boulder, US | daily high max | 38.9 C (102.0 F) | 2.2 C (4.0 F) | 91 years | 42 of 100 (Notable) |
| 25 July 2026 | Boulder, US | daily high max | 37.8 C (100.0 F) | 1.1 C (2.0 F) | 95 years | 40 of 100 (Notable) |
| 20 July 2026 | Boulder, US | daily high max | 38.3 C (100.9 F) | 0.5 C (0.9 F) | 28 years | 19 of 100 (Routine) |
| 14 May 2026 | Boulder, US | daily high min | 16.7 C (62.1 F) | 1.1 C (2.0 F) | 37 years | 23 of 100 (Routine) |
| 14 May 2026 | Boulder, US | daily high max (Tie) | 31.1 C (88.0 F) | tie | 29 years | 4 of 100 (Routine) |
Climate Trend
114 complete years, 1898 to 2025| Year | Annual mean temperature | Difference from the station mean |
|---|---|---|
| 1898 | 9.9 C | -0.98 C |
| 1899 | 9.8 C | -1.05 C |
| 1900 | 11.5 C | +0.63 C |
| 1901 | 11.1 C | +0.22 C |
| 1902 | 10.9 C | +0.11 C |
| 1903 | 10.0 C | -0.82 C |
| 1904 | 11.2 C | +0.37 C |
| 1905 | 10.0 C | -0.80 C |
| 1906 | 10.3 C | -0.55 C |
| 1907 | 11.0 C | +0.19 C |
| 1908 | 10.9 C | +0.09 C |
| 1909 | 9.6 C | -1.26 C |
| 1913 | 9.3 C | -1.52 C |
| 1914 | 11.0 C | +0.14 C |
| 1915 | 9.8 C | -1.03 C |
| 1916 | 10.8 C | -0.06 C |
| 1917 | 10.5 C | -0.29 C |
| 1918 | 11.2 C | +0.38 C |
| 1920 | 9.5 C | -1.31 C |
| 1921 | 11.4 C | +0.56 C |
| 1922 | 10.4 C | -0.40 C |
| 1923 | 9.2 C | -1.67 C |
| 1924 | 9.8 C | -1.02 C |
| 1925 | 10.5 C | -0.32 C |
| 1926 | 10.4 C | -0.39 C |
| 1927 | 10.3 C | -0.57 C |
| 1928 | 9.7 C | -1.10 C |
| 1929 | 9.4 C | -1.42 C |
| 1930 | 10.3 C | -0.57 C |
| 1931 | 11.2 C | +0.34 C |
| 1932 | 9.9 C | -0.95 C |
| 1933 | 11.9 C | +1.11 C |
| 1934 | 12.6 C | +1.75 C |
| 1935 | 10.1 C | -0.73 C |
| 1937 | 9.8 C | -1.04 C |
| 1938 | 10.5 C | -0.38 C |
| 1939 | 10.7 C | -0.15 C |
| 1940 | 9.8 C | -1.05 C |
| 1941 | 9.2 C | -1.62 C |
| 1942 | 9.6 C | -1.27 C |
| 1943 | 10.9 C | +0.10 C |
| 1944 | 9.5 C | -1.29 C |
| 1945 | 9.9 C | -0.89 C |
| 1946 | 11.1 C | +0.28 C |
| 1947 | 11.2 C | +0.32 C |
| 1948 | 11.5 C | +0.63 C |
| 1949 | 11.7 C | +0.83 C |
| 1950 | 11.9 C | +1.05 C |
| 1951 | 10.5 C | -0.36 C |
| 1952 | 12.0 C | +1.13 C |
| 1953 | 12.7 C | +1.83 C |
| 1954 | 13.4 C | +2.52 C |
| 1955 | 11.3 C | +0.50 C |
| 1956 | 12.4 C | +1.58 C |
| 1957 | 11.3 C | +0.44 C |
| 1958 | 11.8 C | +0.99 C |
| 1959 | 10.6 C | -0.20 C |
| 1960 | 11.5 C | +0.62 C |
| 1961 | 10.7 C | -0.12 C |
| 1962 | 11.3 C | +0.45 C |
| 1963 | 12.0 C | +1.18 C |
| 1964 | 11.2 C | +0.38 C |
| 1965 | 10.9 C | +0.11 C |
| 1966 | 11.5 C | +0.70 C |
| 1967 | 11.0 C | +0.18 C |
| 1968 | 10.8 C | -0.01 C |
| 1969 | 11.0 C | +0.13 C |
| 1970 | 10.7 C | -0.09 C |
| 1971 | 10.3 C | -0.53 C |
| 1972 | 10.4 C | -0.42 C |
| 1973 | 10.1 C | -0.78 C |
| 1974 | 10.7 C | -0.11 C |
| 1975 | 10.2 C | -0.60 C |
| 1976 | 10.6 C | -0.24 C |
| 1977 | 11.3 C | +0.45 C |
| 1980 | 11.5 C | +0.64 C |
| 1981 | 11.8 C | +0.99 C |
| 1984 | 10.1 C | -0.74 C |
| 1985 | 10.0 C | -0.85 C |
| 1986 | 11.5 C | +0.68 C |
| 1987 | 10.9 C | +0.06 C |
| 1988 | 11.1 C | +0.24 C |
| 1991 | 10.6 C | -0.27 C |
| 1992 | 10.6 C | -0.26 C |
| 1994 | 11.0 C | +0.14 C |
| 1995 | 10.5 C | -0.33 C |
| 1996 | 10.6 C | -0.21 C |
| 1997 | 10.2 C | -0.62 C |
| 1998 | 10.8 C | -0.07 C |
| 1999 | 11.3 C | +0.45 C |
| 2000 | 11.1 C | +0.24 C |
| 2001 | 11.3 C | +0.49 C |
| 2002 | 11.0 C | +0.15 C |
| 2003 | 11.3 C | +0.47 C |
| 2004 | 10.7 C | -0.11 C |
| 2005 | 11.4 C | +0.52 C |
| 2006 | 11.6 C | +0.75 C |
| 2007 | 11.2 C | +0.36 C |
| 2008 | 10.7 C | -0.18 C |
| 2010 | 10.9 C | +0.04 C |
| 2011 | 10.9 C | +0.08 C |
| 2012 | 12.6 C | +1.72 C |
| 2013 | 10.4 C | -0.43 C |
| 2014 | 10.7 C | -0.12 C |
| 2015 | 11.4 C | +0.56 C |
| 2016 | 11.8 C | +0.97 C |
| 2018 | 11.2 C | +0.37 C |
| 2019 | 10.2 C | -0.65 C |
| 2020 | 11.5 C | +0.62 C |
| 2021 | 11.3 C | +0.51 C |
| 2022 | 10.8 C | -0.07 C |
| 2023 | 10.7 C | -0.15 C |
| 2024 | 12.0 C | +1.14 C |
| 2025 | 11.8 C | +1.01 C |
The annual mean temperature here has risen by 0.07 C (0.03 to 0.11) per decade over 1898 to 2025. In Fahrenheit: 0.1 F (0.1 to 0.2) per decade. The slope is a straight line fitted to 114 complete years; the brackets give its 95 percent interval.
| Measure | Per decade (C) | Per decade (F) | Period | Complete years | Reading |
|---|---|---|---|---|---|
| Annual mean temperature | 0.07 C (0.03 to 0.11) per decade | 0.1 F (0.1 to 0.2) per decade | 1898 to 2025 | 114 | Rise |
| Mean daily maximum | 0.2 C (0.1 to 0.2) per decade | 0.3 F (0.2 to 0.4) per decade | 1898 to 2025 | 114 | Rise |
| Mean daily minimum | -0.02 C (-0.06 to 0.01) per decade | -0.05 F (-0.12 to 0.03) per decade | 1898 to 2025 | 114 | Not clearly different from zero |
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
1893 to 2026| Measure | Record | Year of the record | Median year | Years with a value |
|---|---|---|---|---|
| Hottest day (TXx) | 40.0 C (104.0 F) | 1954 | 36.7 C (98.1 F) | 133 |
| Coldest night (TNn) | -36.1 C (-33.0 F) | 1930 | -22.8 C (-9.0 F) | 133 |
| Wettest day (Rx1day) | 230.6 mm (9.1 in) | 2013 | 43.7 mm (1.7 in) | 133 |
| Wettest five days (Rx5day) | 391.0 mm (15.4 in) | 2013 | 63.1 mm (2.5 in) | 133 |
| Longest dry spell (CDD) | 61 days | 1943 | 31 days | 133 |
Hottest day (TXx)
| Year | Hottest day (TXx) |
|---|---|
| 1893 | 25.6 C (78.1 F) |
| 1894 | 31.7 C (89.1 F) |
| 1895 | 30.0 C (86.0 F) |
| 1897 | 32.2 C (90.0 F) |
| 1898 | 35.0 C (95.0 F) |
| 1899 | 35.0 C (95.0 F) |
| 1900 | 35.0 C (95.0 F) |
| 1901 | 35.0 C (95.0 F) |
| 1902 | 36.1 C (97.0 F) |
| 1903 | 34.4 C (93.9 F) |
| 1904 | 33.3 C (91.9 F) |
| 1905 | 35.0 C (95.0 F) |
| 1906 | 31.7 C (89.1 F) |
| 1907 | 33.9 C (93.0 F) |
| 1908 | 33.3 C (91.9 F) |
| 1909 | 32.8 C (91.0 F) |
| 1910 | 32.2 C (90.0 F) |
| 1911 | 36.7 C (98.1 F) |
| 1912 | 32.8 C (91.0 F) |
| 1913 | 34.4 C (93.9 F) |
| 1914 | 33.3 C (91.9 F) |
| 1915 | 33.3 C (91.9 F) |
| 1916 | 35.0 C (95.0 F) |
| 1917 | 37.2 C (99.0 F) |
| 1918 | 36.1 C (97.0 F) |
| 1919 | 35.6 C (96.1 F) |
| 1920 | 35.6 C (96.1 F) |
| 1921 | 34.4 C (93.9 F) |
| 1922 | 36.7 C (98.1 F) |
| 1923 | 33.3 C (91.9 F) |
| 1924 | 35.6 C (96.1 F) |
| 1925 | 37.8 C (100.0 F) |
| 1926 | 35.6 C (96.1 F) |
| 1927 | 34.4 C (93.9 F) |
| 1928 | 35.0 C (95.0 F) |
| 1929 | 35.6 C (96.1 F) |
| 1930 | 36.1 C (97.0 F) |
| 1931 | 38.9 C (102.0 F) |
| 1932 | 35.0 C (95.0 F) |
| 1933 | 36.1 C (97.0 F) |
| 1934 | 37.8 C (100.0 F) |
| 1935 | 37.2 C (99.0 F) |
| 1936 | 38.9 C (102.0 F) |
| 1937 | 35.0 C (95.0 F) |
| 1938 | 37.8 C (100.0 F) |
| 1939 | 36.1 C (97.0 F) |
| 1940 | 35.6 C (96.1 F) |
| 1941 | 33.9 C (93.0 F) |
| 1942 | 35.0 C (95.0 F) |
| 1943 | 37.2 C (99.0 F) |
| 1944 | 35.0 C (95.0 F) |
| 1945 | 33.9 C (93.0 F) |
| 1946 | 36.7 C (98.1 F) |
| 1947 | 38.3 C (100.9 F) |
| 1948 | 36.1 C (97.0 F) |
| 1949 | 36.7 C (98.1 F) |
| 1950 | 35.6 C (96.1 F) |
| 1951 | 37.8 C (100.0 F) |
| 1952 | 37.8 C (100.0 F) |
| 1953 | 38.3 C (100.9 F) |
| 1954 | 40.0 C (104.0 F) |
| 1955 | 37.2 C (99.0 F) |
| 1956 | 36.7 C (98.1 F) |
| 1957 | 36.7 C (98.1 F) |
| 1958 | 37.2 C (99.0 F) |
| 1959 | 36.1 C (97.0 F) |
| 1960 | 36.1 C (97.0 F) |
| 1961 | 35.6 C (96.1 F) |
| 1962 | 36.7 C (98.1 F) |
| 1963 | 36.7 C (98.1 F) |
| 1964 | 36.7 C (98.1 F) |
| 1965 | 36.1 C (97.0 F) |
| 1966 | 36.1 C (97.0 F) |
| 1967 | 35.6 C (96.1 F) |
| 1968 | 35.6 C (96.1 F) |
| 1969 | 38.3 C (100.9 F) |
| 1970 | 34.4 C (93.9 F) |
| 1971 | 37.8 C (100.0 F) |
| 1972 | 35.6 C (96.1 F) |
| 1973 | 37.8 C (100.0 F) |
| 1974 | 35.0 C (95.0 F) |
| 1975 | 37.2 C (99.0 F) |
| 1976 | 37.2 C (99.0 F) |
| 1977 | 36.1 C (97.0 F) |
| 1978 | 36.7 C (98.1 F) |
| 1979 | 38.3 C (100.9 F) |
| 1980 | 37.8 C (100.0 F) |
| 1981 | 36.1 C (97.0 F) |
| 1982 | 36.7 C (98.1 F) |
| 1983 | 37.8 C (100.0 F) |
| 1984 | 36.7 C (98.1 F) |
| 1985 | 36.7 C (98.1 F) |
| 1986 | 36.1 C (97.0 F) |
| 1987 | 35.0 C (95.0 F) |
| 1988 | 36.7 C (98.1 F) |
| 1989 | 37.8 C (100.0 F) |
| 1990 | 37.8 C (100.0 F) |
| 1991 | 35.6 C (96.1 F) |
| 1992 | 36.7 C (98.1 F) |
| 1993 | 35.6 C (96.1 F) |
| 1994 | 38.3 C (100.9 F) |
| 1995 | 37.2 C (99.0 F) |
| 1996 | 37.2 C (99.0 F) |
| 1997 | 35.6 C (96.1 F) |
| 1998 | 37.8 C (100.0 F) |
| 1999 | 35.6 C (96.1 F) |
| 2000 | 36.7 C (98.1 F) |
| 2001 | 37.2 C (99.0 F) |
| 2002 | 38.3 C (100.9 F) |
| 2003 | 38.3 C (100.9 F) |
| 2004 | 35.6 C (96.1 F) |
| 2005 | 38.3 C (100.9 F) |
| 2006 | 37.8 C (100.0 F) |
| 2007 | 36.7 C (98.1 F) |
| 2008 | 37.2 C (99.0 F) |
| 2009 | 35.6 C (96.1 F) |
| 2010 | 36.7 C (98.1 F) |
| 2011 | 36.7 C (98.1 F) |
| 2012 | 38.9 C (102.0 F) |
| 2013 | 36.7 C (98.1 F) |
| 2014 | 36.1 C (97.0 F) |
| 2015 | 35.6 C (96.1 F) |
| 2016 | 37.2 C (99.0 F) |
| 2017 | 37.8 C (100.0 F) |
| 2018 | 36.7 C (98.1 F) |
| 2019 | 37.8 C (100.0 F) |
| 2020 | 37.8 C (100.0 F) |
| 2021 | 37.2 C (99.0 F) |
| 2022 | 37.8 C (100.0 F) |
| 2023 | 36.7 C (98.1 F) |
| 2024 | 37.2 C (99.0 F) |
| 2025 | 38.3 C (100.9 F) |
| 2026 | 40.0 C (104.0 F) |
Coldest night (TNn)
| Year | Coldest night (TNn) |
|---|---|
| 1893 | -18.3 C (-0.9 F) |
| 1894 | -22.2 C (-8.0 F) |
| 1895 | -22.8 C (-9.0 F) |
| 1897 | -18.3 C (-0.9 F) |
| 1898 | -22.8 C (-9.0 F) |
| 1899 | -25.6 C (-14.1 F) |
| 1900 | -23.9 C (-11.0 F) |
| 1901 | -23.9 C (-11.0 F) |
| 1902 | -28.9 C (-20.0 F) |
| 1903 | -24.4 C (-11.9 F) |
| 1904 | -17.8 C (0.0 F) |
| 1905 | -28.9 C (-20.0 F) |
| 1906 | -20.0 C (-4.0 F) |
| 1907 | -19.4 C (-2.9 F) |
| 1908 | -22.2 C (-8.0 F) |
| 1909 | -25.6 C (-14.1 F) |
| 1910 | -22.8 C (-9.0 F) |
| 1911 | -25.6 C (-14.1 F) |
| 1912 | -16.7 C (1.9 F) |
| 1913 | -30.0 C (-22.0 F) |
| 1914 | -26.7 C (-16.1 F) |
| 1915 | -21.1 C (-6.0 F) |
| 1916 | -25.0 C (-13.0 F) |
| 1917 | -23.9 C (-11.0 F) |
| 1918 | -24.4 C (-11.9 F) |
| 1919 | -28.9 C (-20.0 F) |
| 1920 | -20.6 C (-5.1 F) |
| 1921 | -20.0 C (-4.0 F) |
| 1922 | -25.6 C (-14.1 F) |
| 1923 | -27.8 C (-18.0 F) |
| 1924 | -27.8 C (-18.0 F) |
| 1925 | -17.8 C (0.0 F) |
| 1926 | -25.6 C (-14.1 F) |
| 1927 | -26.7 C (-16.1 F) |
| 1928 | -24.4 C (-11.9 F) |
| 1929 | -24.4 C (-11.9 F) |
| 1930 | -36.1 C (-33.0 F) |
| 1931 | -20.6 C (-5.1 F) |
| 1932 | -28.3 C (-18.9 F) |
| 1933 | -28.3 C (-18.9 F) |
| 1934 | -16.7 C (1.9 F) |
| 1935 | -26.7 C (-16.1 F) |
| 1936 | -33.3 C (-27.9 F) |
| 1937 | -26.7 C (-16.1 F) |
| 1938 | -21.1 C (-6.0 F) |
| 1939 | -20.6 C (-5.1 F) |
| 1940 | -23.3 C (-9.9 F) |
| 1941 | -17.8 C (0.0 F) |
| 1942 | -25.6 C (-14.1 F) |
| 1943 | -26.1 C (-15.0 F) |
| 1944 | -17.2 C (1.0 F) |
| 1945 | -17.2 C (1.0 F) |
| 1946 | -18.9 C (-2.0 F) |
| 1947 | -17.8 C (0.0 F) |
| 1948 | -21.7 C (-7.1 F) |
| 1949 | -22.2 C (-8.0 F) |
| 1950 | -24.4 C (-11.9 F) |
| 1951 | -26.1 C (-15.0 F) |
| 1952 | -17.2 C (1.0 F) |
| 1953 | -15.6 C (3.9 F) |
| 1954 | -19.4 C (-2.9 F) |
| 1955 | -18.3 C (-0.9 F) |
| 1956 | -18.3 C (-0.9 F) |
| 1957 | -19.4 C (-2.9 F) |
| 1958 | -17.8 C (0.0 F) |
| 1959 | -25.6 C (-14.1 F) |
| 1960 | -20.6 C (-5.1 F) |
| 1961 | -20.6 C (-5.1 F) |
| 1962 | -25.0 C (-13.0 F) |
| 1963 | -30.0 C (-22.0 F) |
| 1964 | -22.8 C (-9.0 F) |
| 1965 | -18.9 C (-2.0 F) |
| 1966 | -20.6 C (-5.1 F) |
| 1967 | -21.7 C (-7.1 F) |
| 1968 | -21.1 C (-6.0 F) |
| 1969 | -17.2 C (1.0 F) |
| 1970 | -19.4 C (-2.9 F) |
| 1971 | -22.8 C (-9.0 F) |
| 1972 | -26.7 C (-16.1 F) |
| 1973 | -23.9 C (-11.0 F) |
| 1974 | -22.8 C (-9.0 F) |
| 1975 | -22.8 C (-9.0 F) |
| 1976 | -21.7 C (-7.1 F) |
| 1977 | -23.3 C (-9.9 F) |
| 1978 | -18.3 C (-0.9 F) |
| 1979 | -21.7 C (-7.1 F) |
| 1980 | -18.9 C (-2.0 F) |
| 1981 | -23.3 C (-9.9 F) |
| 1982 | -25.6 C (-14.1 F) |
| 1983 | -26.1 C (-15.0 F) |
| 1984 | -28.3 C (-18.9 F) |
| 1985 | -24.4 C (-11.9 F) |
| 1986 | -19.4 C (-2.9 F) |
| 1987 | -20.0 C (-4.0 F) |
| 1988 | -18.9 C (-2.0 F) |
| 1989 | -31.1 C (-24.0 F) |
| 1990 | -31.1 C (-24.0 F) |
| 1991 | -18.9 C (-2.0 F) |
| 1992 | -20.6 C (-5.1 F) |
| 1993 | -22.2 C (-8.0 F) |
| 1994 | -19.4 C (-2.9 F) |
| 1995 | -20.0 C (-4.0 F) |
| 1996 | -26.7 C (-16.1 F) |
| 1997 | -24.4 C (-11.9 F) |
| 1998 | -25.0 C (-13.0 F) |
| 1999 | -13.9 C (7.0 F) |
| 2000 | -17.2 C (1.0 F) |
| 2001 | -20.6 C (-5.1 F) |
| 2002 | -21.1 C (-6.0 F) |
| 2003 | -20.0 C (-4.0 F) |
| 2004 | -21.7 C (-7.1 F) |
| 2005 | -23.3 C (-9.9 F) |
| 2006 | -25.6 C (-14.1 F) |
| 2007 | -25.0 C (-13.0 F) |
| 2008 | -26.1 C (-15.0 F) |
| 2009 | -24.4 C (-11.9 F) |
| 2010 | -21.7 C (-7.1 F) |
| 2011 | -27.2 C (-17.0 F) |
| 2012 | -17.8 C (0.0 F) |
| 2013 | -22.8 C (-9.0 F) |
| 2014 | -25.6 C (-14.1 F) |
| 2015 | -18.3 C (-0.9 F) |
| 2016 | -23.3 C (-9.9 F) |
| 2017 | -18.9 C (-2.0 F) |
| 2018 | -21.1 C (-6.0 F) |
| 2019 | -22.8 C (-9.0 F) |
| 2020 | -19.4 C (-2.9 F) |
| 2021 | -24.4 C (-11.9 F) |
| 2022 | -27.8 C (-18.0 F) |
| 2023 | -25.0 C (-13.0 F) |
| 2024 | -25.6 C (-14.1 F) |
| 2025 | -22.8 C (-9.0 F) |
| 2026 | -21.1 C (-6.0 F) |
Wettest day (Rx1day)
| Year | Wettest day (Rx1day) |
|---|---|
| 1893 | 23.9 mm (0.9 in) |
| 1894 | 58.4 mm (2.3 in) |
| 1895 | 38.9 mm (1.5 in) |
| 1897 | 51.6 mm (2.0 in) |
| 1898 | 25.7 mm (1.0 in) |
| 1899 | 49.5 mm (1.9 in) |
| 1900 | 56.4 mm (2.2 in) |
| 1901 | 37.1 mm (1.5 in) |
| 1902 | 68.6 mm (2.7 in) |
| 1903 | 58.4 mm (2.3 in) |
| 1904 | 40.6 mm (1.6 in) |
| 1905 | 40.6 mm (1.6 in) |
| 1906 | 52.8 mm (2.1 in) |
| 1907 | 46.7 mm (1.8 in) |
| 1908 | 31.5 mm (1.2 in) |
| 1909 | 77.5 mm (3.1 in) |
| 1910 | 38.9 mm (1.5 in) |
| 1911 | 30.5 mm (1.2 in) |
| 1912 | 38.9 mm (1.5 in) |
| 1913 | 37.3 mm (1.5 in) |
| 1914 | 49.8 mm (2.0 in) |
| 1915 | 43.7 mm (1.7 in) |
| 1916 | 63.5 mm (2.5 in) |
| 1917 | 41.9 mm (1.6 in) |
| 1918 | 31.2 mm (1.2 in) |
| 1919 | 121.9 mm (4.8 in) |
| 1920 | 33.5 mm (1.3 in) |
| 1921 | 83.3 mm (3.3 in) |
| 1922 | 22.9 mm (0.9 in) |
| 1923 | 60.7 mm (2.4 in) |
| 1924 | 33.0 mm (1.3 in) |
| 1925 | 26.2 mm (1.0 in) |
| 1926 | 30.0 mm (1.2 in) |
| 1927 | 53.8 mm (2.1 in) |
| 1928 | 45.7 mm (1.8 in) |
| 1929 | 74.9 mm (2.9 in) |
| 1930 | 51.8 mm (2.0 in) |
| 1931 | 39.6 mm (1.6 in) |
| 1932 | 20.3 mm (0.8 in) |
| 1933 | 27.9 mm (1.1 in) |
| 1934 | 32.0 mm (1.3 in) |
| 1935 | 49.8 mm (2.0 in) |
| 1936 | 42.2 mm (1.7 in) |
| 1937 | 38.4 mm (1.5 in) |
| 1938 | 60.5 mm (2.4 in) |
| 1939 | 25.1 mm (1.0 in) |
| 1940 | 28.2 mm (1.1 in) |
| 1941 | 34.5 mm (1.4 in) |
| 1942 | 59.9 mm (2.4 in) |
| 1943 | 33.5 mm (1.3 in) |
| 1944 | 72.9 mm (2.9 in) |
| 1945 | 43.9 mm (1.7 in) |
| 1946 | 23.9 mm (0.9 in) |
| 1947 | 41.9 mm (1.6 in) |
| 1948 | 23.9 mm (0.9 in) |
| 1949 | 86.4 mm (3.4 in) |
| 1950 | 50.5 mm (2.0 in) |
| 1951 | 77.7 mm (3.1 in) |
| 1952 | 51.3 mm (2.0 in) |
| 1953 | 37.8 mm (1.5 in) |
| 1954 | 16.3 mm (0.6 in) |
| 1955 | 24.1 mm (0.9 in) |
| 1956 | 37.6 mm (1.5 in) |
| 1957 | 84.1 mm (3.3 in) |
| 1958 | 33.3 mm (1.3 in) |
| 1959 | 36.6 mm (1.4 in) |
| 1960 | 48.3 mm (1.9 in) |
| 1961 | 38.1 mm (1.5 in) |
| 1962 | 27.7 mm (1.1 in) |
| 1963 | 67.3 mm (2.6 in) |
| 1964 | 26.9 mm (1.1 in) |
| 1965 | 32.0 mm (1.3 in) |
| 1966 | 23.4 mm (0.9 in) |
| 1967 | 46.5 mm (1.8 in) |
| 1968 | 35.6 mm (1.4 in) |
| 1969 | 85.6 mm (3.4 in) |
| 1970 | 53.6 mm (2.1 in) |
| 1971 | 47.2 mm (1.9 in) |
| 1972 | 44.2 mm (1.7 in) |
| 1973 | 56.9 mm (2.2 in) |
| 1974 | 44.2 mm (1.7 in) |
| 1975 | 48.5 mm (1.9 in) |
| 1976 | 22.4 mm (0.9 in) |
| 1977 | 55.4 mm (2.2 in) |
| 1978 | 52.1 mm (2.1 in) |
| 1979 | 33.0 mm (1.3 in) |
| 1980 | 29.0 mm (1.1 in) |
| 1981 | 25.4 mm (1.0 in) |
| 1982 | 48.3 mm (1.9 in) |
| 1983 | 70.4 mm (2.8 in) |
| 1984 | 46.5 mm (1.8 in) |
| 1985 | 31.2 mm (1.2 in) |
| 1986 | 90.4 mm (3.6 in) |
| 1987 | 79.5 mm (3.1 in) |
| 1988 | 47.2 mm (1.9 in) |
| 1989 | 21.1 mm (0.8 in) |
| 1990 | 53.8 mm (2.1 in) |
| 1991 | 59.2 mm (2.3 in) |
| 1992 | 50.8 mm (2.0 in) |
| 1993 | 48.0 mm (1.9 in) |
| 1994 | 48.5 mm (1.9 in) |
| 1995 | 89.2 mm (3.5 in) |
| 1996 | 48.5 mm (1.9 in) |
| 1997 | 81.3 mm (3.2 in) |
| 1998 | 51.3 mm (2.0 in) |
| 1999 | 45.5 mm (1.8 in) |
| 2000 | 46.0 mm (1.8 in) |
| 2001 | 39.1 mm (1.5 in) |
| 2002 | 43.4 mm (1.7 in) |
| 2003 | 62.7 mm (2.5 in) |
| 2004 | 42.2 mm (1.7 in) |
| 2005 | 39.4 mm (1.6 in) |
| 2006 | 32.5 mm (1.3 in) |
| 2007 | 31.0 mm (1.2 in) |
| 2008 | 39.6 mm (1.6 in) |
| 2009 | 65.8 mm (2.6 in) |
| 2010 | 37.6 mm (1.5 in) |
| 2011 | 35.6 mm (1.4 in) |
| 2012 | 50.3 mm (2.0 in) |
| 2013 | 230.6 mm (9.1 in) |
| 2014 | 65.0 mm (2.6 in) |
| 2015 | 49.8 mm (2.0 in) |
| 2016 | 61.0 mm (2.4 in) |
| 2017 | 79.0 mm (3.1 in) |
| 2018 | 36.6 mm (1.4 in) |
| 2019 | 33.8 mm (1.3 in) |
| 2020 | 41.9 mm (1.6 in) |
| 2021 | 41.4 mm (1.6 in) |
| 2022 | 32.0 mm (1.3 in) |
| 2023 | 39.1 mm (1.5 in) |
| 2024 | 59.2 mm (2.3 in) |
| 2025 | 35.8 mm (1.4 in) |
| 2026 | 27.7 mm (1.1 in) |
Wettest five days (Rx5day)
| Year | Wettest five days (Rx5day) |
|---|---|
| 1893 | 24.9 mm (1.0 in) |
| 1894 | 58.4 mm (2.3 in) |
| 1895 | 104.2 mm (4.1 in) |
| 1897 | 65.3 mm (2.6 in) |
| 1898 | 69.1 mm (2.7 in) |
| 1899 | 52.0 mm (2.0 in) |
| 1900 | 82.4 mm (3.2 in) |
| 1901 | 66.5 mm (2.6 in) |
| 1902 | 112.8 mm (4.4 in) |
| 1903 | 58.4 mm (2.3 in) |
| 1904 | 73.9 mm (2.9 in) |
| 1905 | 70.9 mm (2.8 in) |
| 1906 | 58.7 mm (2.3 in) |
| 1907 | 38.3 mm (1.5 in) |
| 1908 | 53.6 mm (2.1 in) |
| 1909 | 104.2 mm (4.1 in) |
| 1910 | 24.4 mm (1.0 in) |
| 1911 | 44.8 mm (1.8 in) |
| 1912 | 83.5 mm (3.3 in) |
| 1913 | 89.9 mm (3.5 in) |
| 1914 | 60.7 mm (2.4 in) |
| 1915 | 53.6 mm (2.1 in) |
| 1916 | 77.7 mm (3.1 in) |
| 1917 | 48.0 mm (1.9 in) |
| 1918 | 46.5 mm (1.8 in) |
| 1919 | 140.9 mm (5.5 in) |
| 1920 | 35.5 mm (1.4 in) |
| 1921 | 77.5 mm (3.1 in) |
| 1922 | 43.6 mm (1.7 in) |
| 1923 | 86.9 mm (3.4 in) |
| 1924 | 68.6 mm (2.7 in) |
| 1925 | 51.6 mm (2.0 in) |
| 1926 | 43.8 mm (1.7 in) |
| 1927 | 72.6 mm (2.9 in) |
| 1928 | 77.2 mm (3.0 in) |
| 1929 | 77.9 mm (3.1 in) |
| 1930 | 52.3 mm (2.1 in) |
| 1931 | 48.3 mm (1.9 in) |
| 1932 | 39.4 mm (1.6 in) |
| 1933 | 57.9 mm (2.3 in) |
| 1934 | 41.0 mm (1.6 in) |
| 1935 | 75.7 mm (3.0 in) |
| 1936 | 73.9 mm (2.9 in) |
| 1937 | 79.5 mm (3.1 in) |
| 1938 | 92.3 mm (3.6 in) |
| 1939 | 24.4 mm (1.0 in) |
| 1940 | 45.7 mm (1.8 in) |
| 1941 | 62.5 mm (2.5 in) |
| 1942 | 106.6 mm (4.2 in) |
| 1943 | 53.8 mm (2.1 in) |
| 1944 | 102.9 mm (4.1 in) |
| 1945 | 53.9 mm (2.1 in) |
| 1946 | 62.3 mm (2.5 in) |
| 1947 | 69.1 mm (2.7 in) |
| 1948 | 44.5 mm (1.8 in) |
| 1949 | 141.6 mm (5.6 in) |
| 1950 | 57.2 mm (2.3 in) |
| 1951 | 128.1 mm (5.0 in) |
| 1952 | 57.7 mm (2.3 in) |
| 1953 | 49.3 mm (1.9 in) |
| 1954 | 38.3 mm (1.5 in) |
| 1955 | 42.2 mm (1.7 in) |
| 1956 | 56.8 mm (2.2 in) |
| 1957 | 113.1 mm (4.5 in) |
| 1958 | 39.7 mm (1.6 in) |
| 1959 | 74.2 mm (2.9 in) |
| 1960 | 56.1 mm (2.2 in) |
| 1961 | 75.5 mm (3.0 in) |
| 1962 | 37.4 mm (1.5 in) |
| 1963 | 84.0 mm (3.3 in) |
| 1964 | 54.5 mm (2.1 in) |
| 1965 | 77.1 mm (3.0 in) |
| 1966 | 42.2 mm (1.7 in) |
| 1967 | 71.7 mm (2.8 in) |
| 1968 | 62.7 mm (2.5 in) |
| 1969 | 189.1 mm (7.4 in) |
| 1970 | 80.2 mm (3.2 in) |
| 1971 | 96.5 mm (3.8 in) |
| 1972 | 48.5 mm (1.9 in) |
| 1973 | 58.2 mm (2.3 in) |
| 1974 | 48.8 mm (1.9 in) |
| 1975 | 74.9 mm (2.9 in) |
| 1976 | 35.0 mm (1.4 in) |
| 1977 | 103.4 mm (4.1 in) |
| 1978 | 105.3 mm (4.1 in) |
| 1979 | 39.3 mm (1.5 in) |
| 1980 | 37.4 mm (1.5 in) |
| 1981 | 47.7 mm (1.9 in) |
| 1982 | 91.6 mm (3.6 in) |
| 1983 | 93.0 mm (3.7 in) |
| 1984 | 54.2 mm (2.1 in) |
| 1985 | 41.3 mm (1.6 in) |
| 1986 | 91.9 mm (3.6 in) |
| 1987 | 83.7 mm (3.3 in) |
| 1988 | 76.4 mm (3.0 in) |
| 1989 | 53.1 mm (2.1 in) |
| 1990 | 66.5 mm (2.6 in) |
| 1991 | 75.1 mm (3.0 in) |
| 1992 | 62.2 mm (2.4 in) |
| 1993 | 67.8 mm (2.7 in) |
| 1994 | 53.6 mm (2.1 in) |
| 1995 | 93.1 mm (3.7 in) |
| 1996 | 101.8 mm (4.0 in) |
| 1997 | 98.4 mm (3.9 in) |
| 1998 | 56.2 mm (2.2 in) |
| 1999 | 103.2 mm (4.1 in) |
| 2000 | 63.1 mm (2.5 in) |
| 2001 | 66.3 mm (2.6 in) |
| 2002 | 49.0 mm (1.9 in) |
| 2003 | 120.6 mm (4.7 in) |
| 2004 | 60.5 mm (2.4 in) |
| 2005 | 57.7 mm (2.3 in) |
| 2006 | 45.5 mm (1.8 in) |
| 2007 | 37.4 mm (1.5 in) |
| 2008 | 65.1 mm (2.6 in) |
| 2009 | 105.0 mm (4.1 in) |
| 2010 | 80.0 mm (3.1 in) |
| 2011 | 63.9 mm (2.5 in) |
| 2012 | 93.3 mm (3.7 in) |
| 2013 | 391.0 mm (15.4 in) |
| 2014 | 83.0 mm (3.3 in) |
| 2015 | 81.9 mm (3.2 in) |
| 2016 | 62.5 mm (2.5 in) |
| 2017 | 99.8 mm (3.9 in) |
| 2018 | 43.2 mm (1.7 in) |
| 2019 | 42.1 mm (1.7 in) |
| 2020 | 71.8 mm (2.8 in) |
| 2021 | 60.2 mm (2.4 in) |
| 2022 | 41.1 mm (1.6 in) |
| 2023 | 109.2 mm (4.3 in) |
| 2024 | 76.0 mm (3.0 in) |
| 2025 | 59.7 mm (2.4 in) |
| 2026 | 43.5 mm (1.7 in) |
Longest dry spell (CDD)
| Year | Longest dry spell (CDD) |
|---|---|
| 1893 | 32 days |
| 1894 | 31 days |
| 1895 | 19 days |
| 1897 | 20 days |
| 1898 | 28 days |
| 1899 | 38 days |
| 1900 | 36 days |
| 1901 | 51 days |
| 1902 | 29 days |
| 1903 | 35 days |
| 1904 | 47 days |
| 1905 | 56 days |
| 1906 | 38 days |
| 1907 | 23 days |
| 1908 | 33 days |
| 1909 | 31 days |
| 1910 | 36 days |
| 1911 | 27 days |
| 1912 | 20 days |
| 1913 | 33 days |
| 1914 | 52 days |
| 1915 | 27 days |
| 1916 | 29 days |
| 1917 | 42 days |
| 1918 | 31 days |
| 1919 | 42 days |
| 1920 | 24 days |
| 1921 | 18 days |
| 1922 | 30 days |
| 1923 | 32 days |
| 1924 | 47 days |
| 1925 | 33 days |
| 1926 | 48 days |
| 1927 | 25 days |
| 1928 | 34 days |
| 1929 | 31 days |
| 1930 | 32 days |
| 1931 | 42 days |
| 1932 | 29 days |
| 1933 | 36 days |
| 1934 | 56 days |
| 1935 | 51 days |
| 1936 | 30 days |
| 1937 | 29 days |
| 1938 | 31 days |
| 1939 | 57 days |
| 1940 | 31 days |
| 1941 | 32 days |
| 1942 | 34 days |
| 1943 | 61 days |
| 1944 | 35 days |
| 1945 | 18 days |
| 1946 | 23 days |
| 1947 | 26 days |
| 1948 | 40 days |
| 1949 | 41 days |
| 1950 | 47 days |
| 1951 | 26 days |
| 1952 | 44 days |
| 1953 | 36 days |
| 1954 | 30 days |
| 1955 | 26 days |
| 1956 | 53 days |
| 1957 | 24 days |
| 1958 | 25 days |
| 1959 | 26 days |
| 1960 | 24 days |
| 1961 | 21 days |
| 1962 | 39 days |
| 1963 | 39 days |
| 1964 | 33 days |
| 1965 | 38 days |
| 1966 | 26 days |
| 1967 | 17 days |
| 1968 | 30 days |
| 1969 | 36 days |
| 1970 | 59 days |
| 1971 | 29 days |
| 1972 | 46 days |
| 1973 | 24 days |
| 1974 | 38 days |
| 1975 | 22 days |
| 1976 | 22 days |
| 1977 | 32 days |
| 1978 | 31 days |
| 1979 | 27 days |
| 1980 | 37 days |
| 1981 | 25 days |
| 1982 | 31 days |
| 1983 | 20 days |
| 1984 | 51 days |
| 1985 | 31 days |
| 1986 | 28 days |
| 1987 | 26 days |
| 1988 | 54 days |
| 1989 | 15 days |
| 1990 | 20 days |
| 1991 | 31 days |
| 1992 | 48 days |
| 1993 | 24 days |
| 1994 | 25 days |
| 1995 | 24 days |
| 1996 | 23 days |
| 1997 | 23 days |
| 1998 | 40 days |
| 1999 | 33 days |
| 2000 | 28 days |
| 2001 | 24 days |
| 2002 | 36 days |
| 2003 | 41 days |
| 2004 | 28 days |
| 2005 | 30 days |
| 2006 | 20 days |
| 2007 | 20 days |
| 2008 | 41 days |
| 2009 | 23 days |
| 2010 | 30 days |
| 2011 | 28 days |
| 2012 | 39 days |
| 2013 | 27 days |
| 2014 | 29 days |
| 2015 | 40 days |
| 2016 | 35 days |
| 2017 | 37 days |
| 2018 | 28 days |
| 2019 | 35 days |
| 2020 | 42 days |
| 2021 | 57 days |
| 2022 | 22 days |
| 2023 | 42 days |
| 2024 | 37 days |
| 2025 | 57 days |
| 2026 | 23 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
114 years with a frostAcross 114 years with a frost, the median last spring frost at Boulder falls on 4 May and the median first autumn frost on 9 October, which leaves a median of 155 days between them.
In 1994 to 2025 the median growing season was 157 days. That is 4 days more than in 1898 to 1931.
Fitted over all years, the growing season changes by +0.6 days per decade at this station.
| Measure | Median, all years | Earliest period (1898 to 1931) | Recent period (1994 to 2025) | Recent against earliest | Fitted trend |
|---|---|---|---|---|---|
| Last spring frost | 4 May | 6 May | 5 May | 1 day earlier | -0.6 days per decade |
| First autumn frost | 9 October | 9 October | 10 October | 1 day later | 0.0 days per decade |
| Growing days | 155 days | 153 days | 157 days | 4 days more | +0.6 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
112 years, 1898 to 2025A day with at least 42.8 mm (1.7 in) of rain is expected about once in 2 years. A day with at least 126.7 mm (5.0 in) of rain is expected about once in 100 years.
| Expected about once in | A day with at least | Note |
|---|---|---|
| 2 years | 42.8 mm (1.7 in) | |
| 5 years | 60.1 mm (2.4 in) | |
| 10 years | 73.3 mm (2.9 in) | |
| 25 years | 92.5 mm (3.6 in) | |
| 50 years | 108.7 mm (4.3 in) | |
| 100 years | 126.7 mm (5.0 in) |
The levels come from a generalised extreme value (GEV) distribution fitted by L-moments to the wettest-day total of each year, 112 years of values from 1898 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: 230.6 mm (9.1 in) in 2013; 90.4 mm (3.6 in) in 1986; 89.2 mm (3.5 in) in 1995.
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, Boulder had a mean temperature of 11.2 C (52.2 F) and 539.0 mm (21.2 in) of rain a year. The 3 stations whose 1961 to 1990 climate was closest to that are New Harmony (United States, 750 km away), Black Rvr Pumps (United States, 827 km away) and Walsenburg 1 NW (United States, 266 km away).
| Twin station | Country | Distance away | Mean temperature, 1961-1990 | Rain a year, 1961-1990 | Climate difference |
|---|---|---|---|---|---|
| New Harmony | United States | 750 km (466 mi) | 11.1 C (51.9 F) | 469.0 mm (18.5 in) | 0.96 |
| Black Rvr Pumps | United States | 827 km (514 mi) | 11.1 C (52.0 F) | 492.3 mm (19.4 in) | 0.99 |
| Walsenburg 1 NW | United States | 266 km (165 mi) | 10.8 C (51.4 F) | 413.6 mm (16.3 in) | 1.09 |
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 2026-10-12 (12 October 2026). Records are computed by this site and are not official.
Data as of . Last revised (2026-10-13).