Helena Weather Records (USC00033242)
Record envelope, standing records and threshold days for Helena (USC00033242), Arkansas, United States, with 135 years of record.
Key Facts for Helena
- Helena (USC00033242) is a weather station in Arkansas, United States at 34.52 latitude and -90.59 longitude, 66 m (218 ft) above sea level.
- The station reports from 1892 to 2026, 135 years of record.
- 1,464 records set at Helena still stand.
- Records are tracked for tmax, tmin, prcp, snow, snwd: an element needs 30 years of data to be eligible.
- Helena set a daily record high maximum temperature of 39.4 C (102.9 F) on 23 August 2026 (provisional).
Provisional Records
Records set in the last 60 days are provisional until they clear the revision window.
About the Station
- Location: Arkansas, United States, 34.52 latitude, -90.59 longitude.
- Elevation: 66 m (218 ft).
- Period of record: 1892 to 2026, 135 years.
- Eligible elements: tmax, tmin, prcp, snow, snwd.
Daily Record Envelope and 2026
3 days at or beyond a record| Month | Highest record high | Lowest record low | 2026 highest maximum | 2026 lowest minimum |
|---|---|---|---|---|
| Jan | 26.1 C (79.0 F) | -22.8 C (-9.0 F) | 22.2 C (72.0 F) | -10.6 C (12.9 F) |
| Feb | 27.8 C (82.0 F) | -19.4 C (-2.9 F) | 25.0 C (77.0 F) | -10.0 C (14.0 F) |
| Mar | 33.3 C (91.9 F) | -11.7 C (10.9 F) | 30.0 C (86.0 F) | -5.0 C (23.0 F) |
| Apr | 35.0 C (95.0 F) | -2.8 C (27.0 F) | 30.6 C (87.1 F) | 5.6 C (42.1 F) |
| May | 39.4 C (102.9 F) | 1.7 C (35.1 F) | 25.0 C (77.0 F) | 7.8 C (46.0 F) |
| Jun | 42.2 C (108.0 F) | 6.7 C (44.1 F) | 34.4 C (93.9 F) | 25.0 C (77.0 F) |
| Jul | 43.9 C (111.0 F) | 9.4 C (48.9 F) | 37.2 C (99.0 F) | 21.7 C (71.1 F) |
| Aug | 42.2 C (108.0 F) | 8.9 C (48.0 F) | 39.4 C (102.9 F) | 17.8 C (64.0 F) |
| Sep | 45.0 C (113.0 F) | -1.1 C (30.0 F) | n/a | n/a |
| Oct | 36.7 C (98.1 F) | -3.9 C (25.0 F) | n/a | n/a |
| Nov | 31.1 C (88.0 F) | -11.1 C (12.0 F) | n/a | n/a |
| Dec | 27.2 C (81.0 F) | -20.0 C (-4.0 F) | n/a | n/a |
Which Years Hold Standing Records
1,464 standing records| Year set | Standing records |
|---|---|
| 1897 | 8 |
| 1903 | 7 |
| 1904 | 6 |
| 1905 | 7 |
| 1906 | 7 |
| 1907 | 19 |
| 1908 | 5 |
| 1909 | 12 |
| 1910 | 22 |
| 1911 | 22 |
| 1912 | 8 |
| 1913 | 7 |
| 1914 | 3 |
| 1924 | 21 |
| 1925 | 82 |
| 1926 | 25 |
| 1927 | 36 |
| 1928 | 18 |
| 1929 | 10 |
| 1930 | 33 |
| 1931 | 23 |
| 1932 | 19 |
| 1933 | 19 |
| 1934 | 16 |
| 1935 | 5 |
| 1936 | 12 |
| 1937 | 21 |
| 1938 | 12 |
| 1939 | 9 |
| 1940 | 31 |
| 1941 | 3 |
| 1942 | 15 |
| 1943 | 23 |
| 1944 | 10 |
| 1945 | 14 |
| 1946 | 9 |
| 1947 | 6 |
| 1948 | 14 |
| 1949 | 7 |
| 1950 | 16 |
| 1951 | 16 |
| 1952 | 20 |
| 1953 | 21 |
| 1954 | 25 |
| 1955 | 13 |
| 1956 | 6 |
| 1957 | 9 |
| 1958 | 6 |
| 1959 | 4 |
| 1960 | 6 |
| 1961 | 12 |
| 1962 | 18 |
| 1963 | 20 |
| 1964 | 13 |
| 1965 | 21 |
| 1966 | 25 |
| 1967 | 23 |
| 1968 | 14 |
| 1969 | 8 |
| 1970 | 13 |
| 1971 | 5 |
| 1972 | 14 |
| 1973 | 2 |
| 1974 | 17 |
| 1975 | 16 |
| 1976 | 18 |
| 1977 | 7 |
| 1978 | 5 |
| 1979 | 6 |
| 1980 | 17 |
| 1981 | 11 |
| 1982 | 12 |
| 1983 | 19 |
| 1984 | 8 |
| 1985 | 10 |
| 1986 | 13 |
| 1987 | 10 |
| 1988 | 5 |
| 1989 | 28 |
| 1990 | 9 |
| 1991 | 12 |
| 1992 | 7 |
| 1993 | 11 |
| 1994 | 6 |
| 1995 | 11 |
| 1996 | 15 |
| 1997 | 7 |
| 1998 | 16 |
| 1999 | 3 |
| 2000 | 11 |
| 2001 | 7 |
| 2002 | 5 |
| 2003 | 3 |
| 2004 | 9 |
| 2005 | 9 |
| 2006 | 10 |
| 2007 | 9 |
| 2008 | 2 |
| 2009 | 2 |
| 2010 | 15 |
| 2011 | 13 |
| 2012 | 11 |
| 2013 | 8 |
| 2014 | 9 |
| 2015 | 9 |
| 2016 | 5 |
| 2017 | 13 |
| 2018 | 14 |
| 2019 | 7 |
| 2020 | 2 |
| 2021 | 9 |
| 2023 | 6 |
| 2024 | 5 |
| 2025 | 6 |
| 2026 | 10 |
All-Time Record Progression
8 new records| Date | Kind | Detail |
|---|---|---|
| 1951-08-08 | Record high minimum temperature | Record high minimum temperature 27.2 C (81.0 F) |
| 1954-07-14 | Record high minimum temperature | Record high minimum temperature 27.8 C (82.0 F) |
| 1962-01-11 | Record low maximum temperature | Record low maximum temperature -8.3 C (17.1 F) |
| 1966-01-30 | Record low maximum temperature | Record low maximum temperature -10.0 C (14.0 F) |
| 1983-12-25 | Record low maximum temperature | Record low maximum temperature -11.7 C (10.9 F) |
| 1985-01-21 | Record low maximum temperature | Record low maximum temperature -12.8 C (9.0 F) |
| 1989-12-23 | Record low maximum temperature | Record low maximum temperature -13.3 C (8.1 F) |
| 1998-07-20 | Record high minimum temperature | Record high minimum temperature 30.0 C (86.0 F) |
Wettest Day of Each Month
May: 255.3 mm (10.1 in)| Month | Record daily precipitation (mm) | Date |
|---|---|---|
| Jan | 132.1 mm (5.2 in) | 8 January 1930 |
| Feb | 141.0 mm (5.6 in) | 10 February 1966 |
| Mar | 147.3 mm (5.8 in) | 12 March 1927 |
| Apr | 127.0 mm (5.0 in) | 27 April 2011 |
| May | 255.3 mm (10.1 in) | 28 May 1893 |
| Jun | 175.5 mm (6.9 in) | 24 June 1980 |
| Jul | 152.4 mm (6.0 in) | 22 July 1980 |
| Aug | 144.8 mm (5.7 in) | 14 August 1982 |
| Sep | 129.3 mm (5.1 in) | 27 September 1959 |
| Oct | 145.0 mm (5.7 in) | 7 October 1984 |
| Nov | 160.8 mm (6.3 in) | 28 November 2001 |
| Dec | 146.1 mm (5.8 in) | 4 December 1978 |
Period of Record Coverage
1897 to 2026| Year | Days with data | Share of year | Complete |
|---|---|---|---|
| 1897 | 237 | 65% | No |
| 1898 | 55 | 15% | No |
| 1903 | 328 | 90% | No |
| 1904 | 356 | 97% | Yes |
| 1905 | 363 | 99% | Yes |
| 1906 | 357 | 98% | Yes |
| 1907 | 361 | 99% | Yes |
| 1908 | 347 | 95% | Yes |
| 1909 | 359 | 98% | Yes |
| 1910 | 331 | 91% | Yes |
| 1911 | 351 | 96% | Yes |
| 1912 | 341 | 93% | Yes |
| 1913 | 317 | 87% | No |
| 1914 | 83 | 23% | No |
| 1924 | 100 | 27% | No |
| 1925 | 349 | 96% | Yes |
| 1926 | 359 | 98% | Yes |
| 1927 | 364 | 100% | Yes |
| 1928 | 365 | 100% | Yes |
| 1929 | 363 | 99% | Yes |
| 1930 | 364 | 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 | 366 | 100% | Yes |
| 1941 | 365 | 100% | Yes |
| 1942 | 364 | 100% | Yes |
| 1943 | 365 | 100% | Yes |
| 1944 | 366 | 100% | Yes |
| 1945 | 365 | 100% | Yes |
| 1946 | 365 | 100% | Yes |
| 1947 | 365 | 100% | Yes |
| 1948 | 364 | 99% | Yes |
| 1949 | 365 | 100% | Yes |
| 1950 | 362 | 99% | Yes |
| 1951 | 364 | 100% | Yes |
| 1952 | 364 | 99% | Yes |
| 1953 | 365 | 100% | Yes |
| 1954 | 273 | 75% | No |
| 1955 | 364 | 100% | Yes |
| 1956 | 366 | 100% | Yes |
| 1957 | 364 | 100% | Yes |
| 1958 | 365 | 100% | Yes |
| 1959 | 365 | 100% | Yes |
| 1960 | 366 | 100% | Yes |
| 1961 | 365 | 100% | Yes |
| 1962 | 365 | 100% | Yes |
| 1963 | 365 | 100% | Yes |
| 1964 | 364 | 99% | Yes |
| 1965 | 334 | 92% | Yes |
| 1966 | 362 | 99% | Yes |
| 1967 | 362 | 99% | Yes |
| 1968 | 365 | 100% | Yes |
| 1969 | 365 | 100% | Yes |
| 1970 | 357 | 98% | Yes |
| 1971 | 363 | 99% | Yes |
| 1972 | 345 | 94% | Yes |
| 1973 | 88 | 24% | No |
| 1974 | 357 | 98% | Yes |
| 1975 | 363 | 99% | Yes |
| 1976 | 352 | 96% | Yes |
| 1977 | 363 | 99% | Yes |
| 1978 | 365 | 100% | Yes |
| 1979 | 355 | 97% | Yes |
| 1980 | 265 | 72% | No |
| 1981 | 363 | 99% | Yes |
| 1982 | 362 | 99% | Yes |
| 1983 | 363 | 99% | Yes |
| 1984 | 366 | 100% | Yes |
| 1985 | 363 | 99% | Yes |
| 1986 | 365 | 100% | Yes |
| 1987 | 365 | 100% | Yes |
| 1988 | 365 | 100% | Yes |
| 1989 | 362 | 99% | Yes |
| 1990 | 365 | 100% | Yes |
| 1991 | 364 | 100% | Yes |
| 1992 | 364 | 99% | Yes |
| 1993 | 363 | 99% | Yes |
| 1994 | 362 | 99% | Yes |
| 1995 | 351 | 96% | Yes |
| 1996 | 320 | 87% | No |
| 1997 | 363 | 99% | Yes |
| 1998 | 357 | 98% | Yes |
| 1999 | 345 | 95% | Yes |
| 2000 | 310 | 85% | No |
| 2001 | 316 | 87% | No |
| 2002 | 296 | 81% | No |
| 2003 | 340 | 93% | Yes |
| 2004 | 362 | 99% | Yes |
| 2005 | 364 | 100% | Yes |
| 2006 | 361 | 99% | Yes |
| 2007 | 362 | 99% | Yes |
| 2008 | 362 | 99% | Yes |
| 2009 | 295 | 81% | No |
| 2010 | 360 | 99% | Yes |
| 2011 | 364 | 100% | Yes |
| 2012 | 365 | 100% | Yes |
| 2013 | 357 | 98% | Yes |
| 2014 | 357 | 98% | Yes |
| 2015 | 364 | 100% | Yes |
| 2016 | 366 | 100% | Yes |
| 2017 | 365 | 100% | Yes |
| 2018 | 365 | 100% | Yes |
| 2019 | 334 | 92% | Yes |
| 2020 | 335 | 92% | Yes |
| 2021 | 212 | 58% | No |
| 2023 | 209 | 57% | No |
| 2024 | 344 | 94% | Yes |
| 2025 | 291 | 80% | No |
| 2026 | 183 | 50% | No |
Latest Records
20| Date | Station | Record | Value | Beat old record by | Old record stood | Significance |
|---|---|---|---|---|---|---|
| 23 August 2026 | Helena, US | daily high max (Provisional) | 39.4 C (102.9 F) | 1.1 C (2.0 F) | 25 years | 20 of 100 (Routine) |
| 17 August 2026 | Helena, US | daily high min (Provisional) | 27.2 C (81.0 F) | 0.5 C (0.9 F) | 72 years | 32 of 100 (Routine) |
| 15 July 2026 | Helena, US | daily rain | 31.8 mm (1.3 in) | 0.3 mm (0.01 in) | 105 years | 40 of 100 (Notable) |
| 13 June 2026 | Helena, US | daily rain | 47.0 mm (1.9 in) | 9.7 mm (0.38 in) | 35 years | 26 of 100 (Routine) |
| 28 April 2026 | Helena, US | daily high min | 21.7 C (71.1 F) | 0.6 C (1.1 F) | 56 years | 27 of 100 (Routine) |
| 4 April 2026 | Helena, US | daily high min | 19.4 C (66.9 F) | 1.6 C (2.9 F) | 99 years | 42 of 100 (Notable) |
| 3 April 2026 | Helena, US | daily high min (Tie) | 19.4 C (66.9 F) | tie | 85 years | 8 of 100 (Routine) |
| 2 April 2026 | Helena, US | daily high min | 19.4 C (66.9 F) | 0.5 C (0.9 F) | 69 years | 31 of 100 (Routine) |
| 1 April 2026 | Helena, US | daily high min (Tie) | 18.3 C (64.9 F) | tie | 13 years | 3 of 100 (Routine) |
| 31 March 2026 | Helena, US | daily high min | 17.8 C (64.0 F) | 0.6 C (1.1 F) | 96 years | 40 of 100 (Notable) |
| 17 March 2026 | Helena, US | daily low min | -5.0 C (23.0 F) | 1.1 C (2.0 F) | 84 years | 37 of 100 (Notable) |
| 11 March 2026 | Helena, US | daily high min | 20.0 C (68.0 F) | 3.3 C (5.9 F) | 72 years | 37 of 100 (Notable) |
| 7 March 2026 | Helena, US | daily high min | 19.4 C (66.9 F) | 2.2 C (4.0 F) | 75 years | 36 of 100 (Notable) |
| 5 March 2026 | Helena, US | daily high min | 18.3 C (64.9 F) | 1.1 C (2.0 F) | 71 years | 33 of 100 (Routine) |
| 20 February 2026 | Helena, US | daily high max | 25.0 C (77.0 F) | 0.6 C (1.1 F) | 15 years | 14 of 100 (Routine) |
| 25 January 2026 | Helena, US | daily snow depth | 12.7 cm (5.0 in) | 5.1 cm (2.0 in) | 86 years | 45 of 100 (Notable) |
| 25 January 2026 | Helena, US | daily snowfall | 8.4 cm (3.3 in) | 0.8 cm (0.3 in) | 78 years | 34 of 100 (Routine) |
| 9 January 2026 | Helena, US | daily high min | 15.6 C (60.1 F) | 1.2 C (2.2 F) | 127 years | 41 of 100 (Notable) |
| 29 December 2025 | Helena, US | daily high max (Tie) | 23.9 C (75.0 F) | tie | 118 years | 10 of 100 (Routine) |
| 27 December 2025 | Helena, US | daily high max | 24.4 C (75.9 F) | 0.5 C (0.9 F) | 10 years | 13 of 100 (Routine) |
Climate Trend
89 complete years, 1904 to 2024| Year | Annual mean temperature | Difference from the station mean |
|---|---|---|
| 1904 | 16.4 C | -0.39 C |
| 1905 | 16.1 C | -0.74 C |
| 1906 | 16.9 C | +0.05 C |
| 1907 | 17.5 C | +0.68 C |
| 1908 | 17.6 C | +0.76 C |
| 1909 | 17.1 C | +0.30 C |
| 1911 | 17.4 C | +0.53 C |
| 1925 | 18.6 C | +1.78 C |
| 1926 | 17.5 C | +0.65 C |
| 1927 | 18.2 C | +1.41 C |
| 1928 | 16.7 C | -0.18 C |
| 1929 | 16.6 C | -0.21 C |
| 1930 | 17.1 C | +0.29 C |
| 1931 | 17.8 C | +0.93 C |
| 1932 | 17.0 C | +0.15 C |
| 1933 | 17.6 C | +0.79 C |
| 1934 | 17.5 C | +0.70 C |
| 1935 | 17.0 C | +0.20 C |
| 1936 | 17.1 C | +0.23 C |
| 1937 | 16.9 C | +0.09 C |
| 1938 | 18.0 C | +1.17 C |
| 1939 | 17.3 C | +0.45 C |
| 1940 | 15.4 C | -1.48 C |
| 1941 | 17.0 C | +0.12 C |
| 1942 | 16.7 C | -0.10 C |
| 1943 | 17.0 C | +0.12 C |
| 1944 | 17.0 C | +0.17 C |
| 1945 | 16.6 C | -0.19 C |
| 1946 | 17.4 C | +0.55 C |
| 1947 | 16.5 C | -0.29 C |
| 1948 | 16.5 C | -0.36 C |
| 1949 | 17.5 C | +0.70 C |
| 1950 | 17.2 C | +0.41 C |
| 1951 | 17.5 C | +0.69 C |
| 1953 | 18.0 C | +1.13 C |
| 1955 | 17.8 C | +0.95 C |
| 1956 | 17.9 C | +1.10 C |
| 1957 | 17.3 C | +0.48 C |
| 1958 | 16.3 C | -0.54 C |
| 1959 | 17.3 C | +0.49 C |
| 1960 | 16.6 C | -0.23 C |
| 1961 | 16.4 C | -0.45 C |
| 1962 | 16.6 C | -0.26 C |
| 1963 | 15.9 C | -0.96 C |
| 1964 | 16.4 C | -0.40 C |
| 1966 | 15.1 C | -1.78 C |
| 1967 | 15.5 C | -1.36 C |
| 1968 | 15.0 C | -1.85 C |
| 1969 | 15.1 C | -1.75 C |
| 1970 | 15.9 C | -0.96 C |
| 1971 | 16.3 C | -0.55 C |
| 1974 | 15.7 C | -1.16 C |
| 1975 | 15.6 C | -1.24 C |
| 1977 | 15.9 C | -0.98 C |
| 1978 | 15.1 C | -1.72 C |
| 1979 | 14.6 C | -2.28 C |
| 1981 | 16.2 C | -0.59 C |
| 1982 | 16.4 C | -0.46 C |
| 1983 | 15.3 C | -1.55 C |
| 1984 | 15.9 C | -0.96 C |
| 1985 | 16.6 C | -0.26 C |
| 1986 | 17.5 C | +0.68 C |
| 1987 | 17.2 C | +0.37 C |
| 1988 | 16.4 C | -0.44 C |
| 1989 | 15.9 C | -0.96 C |
| 1990 | 17.6 C | +0.74 C |
| 1991 | 17.0 C | +0.21 C |
| 1992 | 16.5 C | -0.36 C |
| 1993 | 16.2 C | -0.66 C |
| 1994 | 16.8 C | -0.07 C |
| 1995 | 16.8 C | -0.02 C |
| 1997 | 16.7 C | -0.18 C |
| 1998 | 18.5 C | +1.66 C |
| 1999 | 17.9 C | +1.06 C |
| 2003 | 17.0 C | +0.21 C |
| 2004 | 17.3 C | +0.42 C |
| 2005 | 17.5 C | +0.69 C |
| 2006 | 17.5 C | +0.66 C |
| 2007 | 17.7 C | +0.90 C |
| 2008 | 16.5 C | -0.34 C |
| 2010 | 17.1 C | +0.26 C |
| 2011 | 17.4 C | +0.54 C |
| 2012 | 18.3 C | +1.45 C |
| 2014 | 15.7 C | -1.10 C |
| 2015 | 16.7 C | -0.12 C |
| 2016 | 17.7 C | +0.82 C |
| 2017 | 17.7 C | +0.90 C |
| 2018 | 16.8 C | -0.06 C |
| 2024 | 18.1 C | +1.31 C |
The fitted trend in annual mean temperature here over 1904 to 2024 is -0.02 C (-0.08 to 0.04) per decade. The interval includes zero, so the trend is not clearly different from zero. In Fahrenheit: -0.04 F (-0.14 to 0.07) per decade. The slope is a straight line fitted to 89 complete years; the brackets give its 95 percent interval.
| Measure | Per decade (C) | Per decade (F) | Period | Complete years | Reading |
|---|---|---|---|---|---|
| Annual mean temperature | -0.02 C (-0.08 to 0.04) per decade | -0.04 F (-0.14 to 0.07) per decade | 1904 to 2024 | 89 | Not clearly different from zero |
| Mean daily maximum | -0.06 C (-0.13 to 0.01) per decade | -0.11 F (-0.24 to 0.01) per decade | 1904 to 2024 | 89 | Not clearly different from zero |
| Mean daily minimum | 0.02 C (-0.04 to 0.09) per decade | 0.04 F (-0.07 to 0.16) per decade | 1904 to 2024 | 89 | 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
1892 to 2026| Measure | Record | Year of the record | Median year | Years with a value |
|---|---|---|---|---|
| Hottest day (TXx) | 45.0 C (113.0 F) | 1925 | 37.8 C (100.0 F) | 116 |
| Coldest night (TNn) | -22.8 C (-9.0 F) | 1930 | -11.1 C (12.0 F) | 116 |
| Wettest day (Rx1day) | 255.3 mm (10.1 in) | 1893 | 81.2 mm (3.2 in) | 134 |
| Wettest five days (Rx5day) | 415.0 mm (16.3 in) | 1906 | 136.3 mm (5.4 in) | 134 |
| Longest dry spell (CDD) | 60 days | 2015 | 23 days | 134 |
Hottest day (TXx)
| Year | Hottest day (TXx) |
|---|---|
| 1892 | n/a |
| 1893 | n/a |
| 1894 | n/a |
| 1895 | n/a |
| 1896 | n/a |
| 1897 | 33.9 C (93.0 F) |
| 1898 | 20.0 C (68.0 F) |
| 1899 | n/a |
| 1900 | n/a |
| 1901 | n/a |
| 1902 | n/a |
| 1903 | 36.7 C (98.1 F) |
| 1904 | 35.6 C (96.1 F) |
| 1905 | 36.1 C (97.0 F) |
| 1906 | 36.7 C (98.1 F) |
| 1907 | 38.3 C (100.9 F) |
| 1908 | 36.7 C (98.1 F) |
| 1909 | 37.2 C (99.0 F) |
| 1910 | 37.2 C (99.0 F) |
| 1911 | 38.3 C (100.9 F) |
| 1912 | 38.9 C (102.0 F) |
| 1913 | 40.0 C (104.0 F) |
| 1914 | 24.4 C (75.9 F) |
| 1915 | n/a |
| 1916 | n/a |
| 1917 | n/a |
| 1918 | n/a |
| 1919 | n/a |
| 1920 | n/a |
| 1921 | n/a |
| 1922 | n/a |
| 1923 | n/a |
| 1924 | 35.6 C (96.1 F) |
| 1925 | 45.0 C (113.0 F) |
| 1926 | 41.7 C (107.1 F) |
| 1927 | 38.3 C (100.9 F) |
| 1928 | 36.7 C (98.1 F) |
| 1929 | 37.8 C (100.0 F) |
| 1930 | 43.9 C (111.0 F) |
| 1931 | 40.0 C (104.0 F) |
| 1932 | 37.8 C (100.0 F) |
| 1933 | 38.3 C (100.9 F) |
| 1934 | 40.6 C (105.1 F) |
| 1935 | 39.4 C (102.9 F) |
| 1936 | 39.4 C (102.9 F) |
| 1937 | 37.8 C (100.0 F) |
| 1938 | 38.9 C (102.0 F) |
| 1939 | 37.8 C (100.0 F) |
| 1940 | 35.6 C (96.1 F) |
| 1941 | 36.1 C (97.0 F) |
| 1942 | 37.8 C (100.0 F) |
| 1943 | 40.6 C (105.1 F) |
| 1944 | 38.3 C (100.9 F) |
| 1945 | 36.7 C (98.1 F) |
| 1946 | 35.0 C (95.0 F) |
| 1947 | 38.9 C (102.0 F) |
| 1948 | 36.7 C (98.1 F) |
| 1949 | 35.6 C (96.1 F) |
| 1950 | 36.1 C (97.0 F) |
| 1951 | 38.3 C (100.9 F) |
| 1952 | 40.6 C (105.1 F) |
| 1953 | 38.9 C (102.0 F) |
| 1954 | 41.1 C (106.0 F) |
| 1955 | 37.8 C (100.0 F) |
| 1956 | 39.4 C (102.9 F) |
| 1957 | 36.1 C (97.0 F) |
| 1958 | 36.1 C (97.0 F) |
| 1959 | 36.1 C (97.0 F) |
| 1960 | 37.8 C (100.0 F) |
| 1961 | 36.7 C (98.1 F) |
| 1962 | 36.7 C (98.1 F) |
| 1963 | 37.2 C (99.0 F) |
| 1964 | 39.4 C (102.9 F) |
| 1965 | 37.8 C (100.0 F) |
| 1966 | 38.3 C (100.9 F) |
| 1967 | 35.0 C (95.0 F) |
| 1968 | 35.6 C (96.1 F) |
| 1969 | 37.8 C (100.0 F) |
| 1970 | 37.2 C (99.0 F) |
| 1971 | 37.8 C (100.0 F) |
| 1972 | 36.7 C (98.1 F) |
| 1973 | 25.6 C (78.1 F) |
| 1974 | 36.1 C (97.0 F) |
| 1975 | 35.6 C (96.1 F) |
| 1976 | 36.7 C (98.1 F) |
| 1977 | 38.9 C (102.0 F) |
| 1978 | 36.7 C (98.1 F) |
| 1979 | 34.4 C (93.9 F) |
| 1980 | 41.7 C (107.1 F) |
| 1981 | 38.3 C (100.9 F) |
| 1982 | 36.7 C (98.1 F) |
| 1983 | 38.3 C (100.9 F) |
| 1984 | 36.1 C (97.0 F) |
| 1985 | 37.8 C (100.0 F) |
| 1986 | 40.6 C (105.1 F) |
| 1987 | 37.8 C (100.0 F) |
| 1988 | 38.9 C (102.0 F) |
| 1989 | 35.6 C (96.1 F) |
| 1990 | 37.8 C (100.0 F) |
| 1991 | 37.2 C (99.0 F) |
| 1992 | 34.4 C (93.9 F) |
| 1993 | 36.7 C (98.1 F) |
| 1994 | 35.0 C (95.0 F) |
| 1995 | 37.8 C (100.0 F) |
| 1996 | 36.7 C (98.1 F) |
| 1997 | 37.2 C (99.0 F) |
| 1998 | 38.3 C (100.9 F) |
| 1999 | 38.3 C (100.9 F) |
| 2000 | 41.7 C (107.1 F) |
| 2001 | 36.7 C (98.1 F) |
| 2002 | 36.7 C (98.1 F) |
| 2003 | 37.2 C (99.0 F) |
| 2004 | 36.1 C (97.0 F) |
| 2005 | 38.3 C (100.9 F) |
| 2006 | 39.4 C (102.9 F) |
| 2007 | 40.0 C (104.0 F) |
| 2008 | 37.8 C (100.0 F) |
| 2009 | 39.4 C (102.9 F) |
| 2010 | 40.0 C (104.0 F) |
| 2011 | 41.1 C (106.0 F) |
| 2012 | 38.3 C (100.9 F) |
| 2013 | 36.1 C (97.0 F) |
| 2014 | 35.0 C (95.0 F) |
| 2015 | 35.6 C (96.1 F) |
| 2016 | 35.6 C (96.1 F) |
| 2017 | 36.1 C (97.0 F) |
| 2018 | 36.7 C (98.1 F) |
| 2019 | 36.7 C (98.1 F) |
| 2020 | 35.6 C (96.1 F) |
| 2021 | 36.1 C (97.0 F) |
| 2023 | 37.8 C (100.0 F) |
| 2024 | 38.3 C (100.9 F) |
| 2025 | 38.3 C (100.9 F) |
| 2026 | 39.4 C (102.9 F) |
Coldest night (TNn)
| Year | Coldest night (TNn) |
|---|---|
| 1892 | n/a |
| 1893 | n/a |
| 1894 | n/a |
| 1895 | n/a |
| 1896 | n/a |
| 1897 | -3.9 C (25.0 F) |
| 1898 | -8.3 C (17.1 F) |
| 1899 | n/a |
| 1900 | n/a |
| 1901 | n/a |
| 1902 | n/a |
| 1903 | -14.4 C (6.1 F) |
| 1904 | -12.8 C (9.0 F) |
| 1905 | -16.7 C (1.9 F) |
| 1906 | -10.6 C (12.9 F) |
| 1907 | -10.0 C (14.0 F) |
| 1908 | -11.1 C (12.0 F) |
| 1909 | -11.1 C (12.0 F) |
| 1910 | -13.9 C (7.0 F) |
| 1911 | -16.7 C (1.9 F) |
| 1912 | -16.1 C (3.0 F) |
| 1913 | -5.6 C (21.9 F) |
| 1914 | -9.4 C (15.1 F) |
| 1915 | n/a |
| 1916 | n/a |
| 1917 | n/a |
| 1918 | n/a |
| 1919 | n/a |
| 1920 | n/a |
| 1921 | n/a |
| 1922 | n/a |
| 1923 | n/a |
| 1924 | -13.3 C (8.1 F) |
| 1925 | -12.8 C (9.0 F) |
| 1926 | -8.9 C (16.0 F) |
| 1927 | -11.1 C (12.0 F) |
| 1928 | -14.4 C (6.1 F) |
| 1929 | -12.8 C (9.0 F) |
| 1930 | -22.8 C (-9.0 F) |
| 1931 | -8.9 C (16.0 F) |
| 1932 | -12.2 C (10.0 F) |
| 1933 | -16.1 C (3.0 F) |
| 1934 | -13.3 C (8.1 F) |
| 1935 | -10.6 C (12.9 F) |
| 1936 | -15.6 C (3.9 F) |
| 1937 | -10.6 C (12.9 F) |
| 1938 | -10.0 C (14.0 F) |
| 1939 | -7.8 C (18.0 F) |
| 1940 | -20.0 C (-4.0 F) |
| 1941 | -8.9 C (16.0 F) |
| 1942 | -18.3 C (-0.9 F) |
| 1943 | -13.9 C (7.0 F) |
| 1944 | -15.0 C (5.0 F) |
| 1945 | -10.6 C (12.9 F) |
| 1946 | -8.3 C (17.1 F) |
| 1947 | -11.1 C (12.0 F) |
| 1948 | -14.4 C (6.1 F) |
| 1949 | -10.0 C (14.0 F) |
| 1950 | -10.6 C (12.9 F) |
| 1951 | -19.4 C (-2.9 F) |
| 1952 | -5.6 C (21.9 F) |
| 1953 | -9.4 C (15.1 F) |
| 1954 | -6.7 C (19.9 F) |
| 1955 | -10.6 C (12.9 F) |
| 1956 | -5.6 C (21.9 F) |
| 1957 | -10.6 C (12.9 F) |
| 1958 | -11.7 C (10.9 F) |
| 1959 | -11.7 C (10.9 F) |
| 1960 | -8.9 C (16.0 F) |
| 1961 | -11.1 C (12.0 F) |
| 1962 | -18.3 C (-0.9 F) |
| 1963 | -17.8 C (0.0 F) |
| 1964 | -10.6 C (12.9 F) |
| 1965 | -11.7 C (10.9 F) |
| 1966 | -19.4 C (-2.9 F) |
| 1967 | -11.7 C (10.9 F) |
| 1968 | -12.8 C (9.0 F) |
| 1969 | -10.6 C (12.9 F) |
| 1970 | -12.2 C (10.0 F) |
| 1971 | -13.3 C (8.1 F) |
| 1972 | -12.2 C (10.0 F) |
| 1973 | -10.6 C (12.9 F) |
| 1974 | -10.6 C (12.9 F) |
| 1975 | -13.3 C (8.1 F) |
| 1976 | -14.4 C (6.1 F) |
| 1977 | -18.3 C (-0.9 F) |
| 1978 | -11.7 C (10.9 F) |
| 1979 | -14.4 C (6.1 F) |
| 1980 | -9.4 C (15.1 F) |
| 1981 | -12.8 C (9.0 F) |
| 1982 | -19.4 C (-2.9 F) |
| 1983 | -20.0 C (-4.0 F) |
| 1984 | -13.9 C (7.0 F) |
| 1985 | -19.4 C (-2.9 F) |
| 1986 | -11.1 C (12.0 F) |
| 1987 | -8.9 C (16.0 F) |
| 1988 | -14.4 C (6.1 F) |
| 1989 | -19.4 C (-2.9 F) |
| 1990 | -11.1 C (12.0 F) |
| 1991 | -8.9 C (16.0 F) |
| 1992 | -9.4 C (15.1 F) |
| 1993 | -7.2 C (19.0 F) |
| 1994 | -11.7 C (10.9 F) |
| 1995 | -10.6 C (12.9 F) |
| 1996 | -15.0 C (5.0 F) |
| 1997 | -11.1 C (12.0 F) |
| 1998 | -6.7 C (19.9 F) |
| 1999 | -14.4 C (6.1 F) |
| 2000 | -9.4 C (15.1 F) |
| 2001 | -14.4 C (6.1 F) |
| 2002 | -7.2 C (19.0 F) |
| 2003 | -12.2 C (10.0 F) |
| 2004 | -9.4 C (15.1 F) |
| 2005 | -7.8 C (18.0 F) |
| 2006 | -8.9 C (16.0 F) |
| 2007 | -11.1 C (12.0 F) |
| 2008 | -10.0 C (14.0 F) |
| 2009 | -6.7 C (19.9 F) |
| 2010 | -11.7 C (10.9 F) |
| 2011 | -10.0 C (14.0 F) |
| 2012 | -6.1 C (21.0 F) |
| 2013 | -6.7 C (19.9 F) |
| 2014 | -12.8 C (9.0 F) |
| 2015 | -12.2 C (10.0 F) |
| 2016 | -8.3 C (17.1 F) |
| 2017 | -10.6 C (12.9 F) |
| 2018 | -13.3 C (8.1 F) |
| 2019 | -7.8 C (18.0 F) |
| 2020 | -4.4 C (24.1 F) |
| 2021 | -16.1 C (3.0 F) |
| 2023 | -2.8 C (27.0 F) |
| 2024 | -12.2 C (10.0 F) |
| 2025 | -10.6 C (12.9 F) |
| 2026 | -10.6 C (12.9 F) |
Wettest day (Rx1day)
| Year | Wettest day (Rx1day) |
|---|---|
| 1892 | 100.8 mm (4.0 in) |
| 1893 | 255.3 mm (10.1 in) |
| 1894 | 121.9 mm (4.8 in) |
| 1895 | 87.6 mm (3.4 in) |
| 1896 | 125.5 mm (4.9 in) |
| 1897 | 92.7 mm (3.6 in) |
| 1898 | 78.0 mm (3.1 in) |
| 1899 | 60.5 mm (2.4 in) |
| 1900 | 118.9 mm (4.7 in) |
| 1901 | 71.1 mm (2.8 in) |
| 1902 | 118.1 mm (4.6 in) |
| 1903 | 63.0 mm (2.5 in) |
| 1904 | 141.2 mm (5.6 in) |
| 1905 | 87.1 mm (3.4 in) |
| 1906 | 129.3 mm (5.1 in) |
| 1907 | 101.6 mm (4.0 in) |
| 1908 | 68.6 mm (2.7 in) |
| 1909 | 81.8 mm (3.2 in) |
| 1910 | 78.2 mm (3.1 in) |
| 1911 | 105.7 mm (4.2 in) |
| 1912 | 103.4 mm (4.1 in) |
| 1913 | 77.2 mm (3.0 in) |
| 1914 | 100.8 mm (4.0 in) |
| 1915 | 71.1 mm (2.8 in) |
| 1916 | 72.9 mm (2.9 in) |
| 1917 | 59.7 mm (2.4 in) |
| 1918 | 50.8 mm (2.0 in) |
| 1919 | 116.8 mm (4.6 in) |
| 1920 | 96.5 mm (3.8 in) |
| 1921 | 78.7 mm (3.1 in) |
| 1922 | 70.1 mm (2.8 in) |
| 1923 | 122.9 mm (4.8 in) |
| 1924 | 73.7 mm (2.9 in) |
| 1925 | 81.8 mm (3.2 in) |
| 1926 | 78.2 mm (3.1 in) |
| 1927 | 147.3 mm (5.8 in) |
| 1928 | 94.5 mm (3.7 in) |
| 1929 | 73.7 mm (2.9 in) |
| 1930 | 132.1 mm (5.2 in) |
| 1931 | 70.4 mm (2.8 in) |
| 1932 | 72.9 mm (2.9 in) |
| 1933 | 135.1 mm (5.3 in) |
| 1934 | 99.1 mm (3.9 in) |
| 1935 | 106.9 mm (4.2 in) |
| 1936 | 89.4 mm (3.5 in) |
| 1937 | 57.7 mm (2.3 in) |
| 1938 | 92.7 mm (3.6 in) |
| 1939 | 74.7 mm (2.9 in) |
| 1940 | 71.9 mm (2.8 in) |
| 1941 | 68.1 mm (2.7 in) |
| 1942 | 81.5 mm (3.2 in) |
| 1943 | 71.4 mm (2.8 in) |
| 1944 | 72.4 mm (2.9 in) |
| 1945 | 62.0 mm (2.4 in) |
| 1946 | 99.1 mm (3.9 in) |
| 1947 | 37.3 mm (1.5 in) |
| 1948 | 80.0 mm (3.1 in) |
| 1949 | 64.8 mm (2.6 in) |
| 1950 | 70.6 mm (2.8 in) |
| 1951 | 77.2 mm (3.0 in) |
| 1952 | 108.5 mm (4.3 in) |
| 1953 | 73.7 mm (2.9 in) |
| 1954 | 46.5 mm (1.8 in) |
| 1955 | 102.9 mm (4.1 in) |
| 1956 | 53.8 mm (2.1 in) |
| 1957 | 98.8 mm (3.9 in) |
| 1958 | 67.3 mm (2.6 in) |
| 1959 | 129.3 mm (5.1 in) |
| 1960 | 65.8 mm (2.6 in) |
| 1961 | 77.5 mm (3.1 in) |
| 1962 | 62.2 mm (2.4 in) |
| 1963 | 88.9 mm (3.5 in) |
| 1964 | 94.5 mm (3.7 in) |
| 1965 | 114.6 mm (4.5 in) |
| 1966 | 141.0 mm (5.6 in) |
| 1967 | 53.8 mm (2.1 in) |
| 1968 | 69.3 mm (2.7 in) |
| 1969 | 72.1 mm (2.8 in) |
| 1970 | 59.9 mm (2.4 in) |
| 1971 | 58.2 mm (2.3 in) |
| 1972 | 106.2 mm (4.2 in) |
| 1973 | 53.3 mm (2.1 in) |
| 1974 | 193.0 mm (7.6 in) |
| 1975 | 74.9 mm (2.9 in) |
| 1976 | 64.0 mm (2.5 in) |
| 1977 | 72.1 mm (2.8 in) |
| 1978 | 146.1 mm (5.8 in) |
| 1979 | 91.4 mm (3.6 in) |
| 1980 | 175.5 mm (6.9 in) |
| 1981 | 101.6 mm (4.0 in) |
| 1982 | 144.8 mm (5.7 in) |
| 1983 | 109.5 mm (4.3 in) |
| 1984 | 145.0 mm (5.7 in) |
| 1985 | 54.9 mm (2.2 in) |
| 1986 | 90.9 mm (3.6 in) |
| 1987 | 108.7 mm (4.3 in) |
| 1988 | 82.6 mm (3.3 in) |
| 1989 | 108.5 mm (4.3 in) |
| 1990 | 72.4 mm (2.9 in) |
| 1991 | 100.1 mm (3.9 in) |
| 1992 | 62.7 mm (2.5 in) |
| 1993 | 68.6 mm (2.7 in) |
| 1994 | 81.3 mm (3.2 in) |
| 1995 | 67.8 mm (2.7 in) |
| 1996 | 91.4 mm (3.6 in) |
| 1997 | 83.8 mm (3.3 in) |
| 1998 | 40.6 mm (1.6 in) |
| 1999 | 61.0 mm (2.4 in) |
| 2000 | 77.7 mm (3.1 in) |
| 2001 | 160.8 mm (6.3 in) |
| 2002 | 81.0 mm (3.2 in) |
| 2003 | 99.6 mm (3.9 in) |
| 2004 | 110.2 mm (4.3 in) |
| 2005 | 88.9 mm (3.5 in) |
| 2006 | 53.3 mm (2.1 in) |
| 2007 | 61.0 mm (2.4 in) |
| 2008 | 66.0 mm (2.6 in) |
| 2009 | 76.2 mm (3.0 in) |
| 2010 | 58.4 mm (2.3 in) |
| 2011 | 127.0 mm (5.0 in) |
| 2012 | 63.5 mm (2.5 in) |
| 2013 | 101.6 mm (4.0 in) |
| 2014 | 74.9 mm (2.9 in) |
| 2015 | 63.5 mm (2.5 in) |
| 2016 | 106.7 mm (4.2 in) |
| 2017 | 106.7 mm (4.2 in) |
| 2018 | 97.8 mm (3.9 in) |
| 2019 | 116.8 mm (4.6 in) |
| 2020 | 83.8 mm (3.3 in) |
| 2021 | 85.1 mm (3.4 in) |
| 2023 | 50.8 mm (2.0 in) |
| 2024 | 71.9 mm (2.8 in) |
| 2025 | 80.5 mm (3.2 in) |
| 2026 | 53.3 mm (2.1 in) |
Wettest five days (Rx5day)
| Year | Wettest five days (Rx5day) |
|---|---|
| 1892 | 199.1 mm (7.8 in) |
| 1893 | 314.2 mm (12.4 in) |
| 1894 | 145.3 mm (5.7 in) |
| 1895 | 141.7 mm (5.6 in) |
| 1896 | 155.0 mm (6.1 in) |
| 1897 | 214.1 mm (8.4 in) |
| 1898 | 199.0 mm (7.8 in) |
| 1899 | 105.2 mm (4.1 in) |
| 1900 | 144.6 mm (5.7 in) |
| 1901 | 153.7 mm (6.1 in) |
| 1902 | 164.6 mm (6.5 in) |
| 1903 | 91.4 mm (3.6 in) |
| 1904 | 211.8 mm (8.3 in) |
| 1905 | 132.5 mm (5.2 in) |
| 1906 | 415.0 mm (16.3 in) |
| 1907 | 118.9 mm (4.7 in) |
| 1908 | 114.6 mm (4.5 in) |
| 1909 | 94.5 mm (3.7 in) |
| 1910 | 96.0 mm (3.8 in) |
| 1911 | 187.4 mm (7.4 in) |
| 1912 | 115.6 mm (4.6 in) |
| 1913 | 94.7 mm (3.7 in) |
| 1914 | 111.2 mm (4.4 in) |
| 1915 | 111.2 mm (4.4 in) |
| 1916 | 127.8 mm (5.0 in) |
| 1917 | 137.9 mm (5.4 in) |
| 1918 | 95.5 mm (3.8 in) |
| 1919 | 192.5 mm (7.6 in) |
| 1920 | 136.2 mm (5.4 in) |
| 1921 | 113.8 mm (4.5 in) |
| 1922 | 86.3 mm (3.4 in) |
| 1923 | 139.4 mm (5.5 in) |
| 1924 | 92.5 mm (3.6 in) |
| 1925 | 125.0 mm (4.9 in) |
| 1926 | 140.7 mm (5.5 in) |
| 1927 | 219.9 mm (8.7 in) |
| 1928 | 136.1 mm (5.4 in) |
| 1929 | 117.3 mm (4.6 in) |
| 1930 | 244.4 mm (9.6 in) |
| 1931 | 118.8 mm (4.7 in) |
| 1932 | 123.4 mm (4.9 in) |
| 1933 | 160.2 mm (6.3 in) |
| 1934 | 154.7 mm (6.1 in) |
| 1935 | 249.1 mm (9.8 in) |
| 1936 | 128.3 mm (5.1 in) |
| 1937 | 185.6 mm (7.3 in) |
| 1938 | 157.0 mm (6.2 in) |
| 1939 | 157.2 mm (6.2 in) |
| 1940 | 145.5 mm (5.7 in) |
| 1941 | 116.6 mm (4.6 in) |
| 1942 | 109.7 mm (4.3 in) |
| 1943 | 137.4 mm (5.4 in) |
| 1944 | 141.7 mm (5.6 in) |
| 1945 | 142.4 mm (5.6 in) |
| 1946 | 205.0 mm (8.1 in) |
| 1947 | 90.2 mm (3.6 in) |
| 1948 | 133.1 mm (5.2 in) |
| 1949 | 135.1 mm (5.3 in) |
| 1950 | 115.6 mm (4.6 in) |
| 1951 | 107.9 mm (4.2 in) |
| 1952 | 126.5 mm (5.0 in) |
| 1953 | 128.3 mm (5.1 in) |
| 1954 | 81.8 mm (3.2 in) |
| 1955 | 123.9 mm (4.9 in) |
| 1956 | 133.1 mm (5.2 in) |
| 1957 | 154.7 mm (6.1 in) |
| 1958 | 136.4 mm (5.4 in) |
| 1959 | 157.8 mm (6.2 in) |
| 1960 | 124.3 mm (4.9 in) |
| 1961 | 142.7 mm (5.6 in) |
| 1962 | 105.2 mm (4.1 in) |
| 1963 | 121.4 mm (4.8 in) |
| 1964 | 104.1 mm (4.1 in) |
| 1965 | 123.5 mm (4.9 in) |
| 1966 | 182.8 mm (7.2 in) |
| 1967 | 82.7 mm (3.3 in) |
| 1968 | 136.6 mm (5.4 in) |
| 1969 | 111.3 mm (4.4 in) |
| 1970 | 100.5 mm (4.0 in) |
| 1971 | 85.7 mm (3.4 in) |
| 1972 | 134.4 mm (5.3 in) |
| 1973 | 106.1 mm (4.2 in) |
| 1974 | 284.7 mm (11.2 in) |
| 1975 | 153.9 mm (6.1 in) |
| 1976 | 107.7 mm (4.2 in) |
| 1977 | 148.1 mm (5.8 in) |
| 1978 | 176.1 mm (6.9 in) |
| 1979 | 131.4 mm (5.2 in) |
| 1980 | 184.1 mm (7.2 in) |
| 1981 | 143.0 mm (5.6 in) |
| 1982 | 191.8 mm (7.6 in) |
| 1983 | 168.7 mm (6.6 in) |
| 1984 | 197.9 mm (7.8 in) |
| 1985 | 109.0 mm (4.3 in) |
| 1986 | 137.2 mm (5.4 in) |
| 1987 | 229.3 mm (9.0 in) |
| 1988 | 145.9 mm (5.7 in) |
| 1989 | 165.1 mm (6.5 in) |
| 1990 | 138.4 mm (5.4 in) |
| 1991 | 210.5 mm (8.3 in) |
| 1992 | 119.3 mm (4.7 in) |
| 1993 | 109.5 mm (4.3 in) |
| 1994 | 123.2 mm (4.9 in) |
| 1995 | 67.8 mm (2.7 in) |
| 1996 | 122.2 mm (4.8 in) |
| 1997 | 147.5 mm (5.8 in) |
| 1998 | 86.4 mm (3.4 in) |
| 1999 | 101.6 mm (4.0 in) |
| 2000 | 151.4 mm (6.0 in) |
| 2001 | 336.6 mm (13.3 in) |
| 2002 | 173.2 mm (6.8 in) |
| 2003 | 151.4 mm (6.0 in) |
| 2004 | 142.3 mm (5.6 in) |
| 2005 | 121.9 mm (4.8 in) |
| 2006 | 80.0 mm (3.1 in) |
| 2007 | 157.5 mm (6.2 in) |
| 2008 | 88.5 mm (3.5 in) |
| 2009 | 182.9 mm (7.2 in) |
| 2010 | 134.6 mm (5.3 in) |
| 2011 | 247.7 mm (9.8 in) |
| 2012 | 86.4 mm (3.4 in) |
| 2013 | 135.9 mm (5.4 in) |
| 2014 | 109.2 mm (4.3 in) |
| 2015 | 96.5 mm (3.8 in) |
| 2016 | 233.7 mm (9.2 in) |
| 2017 | 147.3 mm (5.8 in) |
| 2018 | 149.9 mm (5.9 in) |
| 2019 | 191.0 mm (7.5 in) |
| 2020 | 96.6 mm (3.8 in) |
| 2021 | 139.7 mm (5.5 in) |
| 2023 | 78.8 mm (3.1 in) |
| 2024 | 150.4 mm (5.9 in) |
| 2025 | 155.5 mm (6.1 in) |
| 2026 | 110.0 mm (4.3 in) |
Longest dry spell (CDD)
| Year | Longest dry spell (CDD) |
|---|---|
| 1892 | 12 days |
| 1893 | 19 days |
| 1894 | 18 days |
| 1895 | 18 days |
| 1896 | 21 days |
| 1897 | 51 days |
| 1898 | 14 days |
| 1899 | 21 days |
| 1900 | 19 days |
| 1901 | 41 days |
| 1902 | 21 days |
| 1903 | 20 days |
| 1904 | 22 days |
| 1905 | 18 days |
| 1906 | 26 days |
| 1907 | 18 days |
| 1908 | 25 days |
| 1909 | 23 days |
| 1910 | 20 days |
| 1911 | 28 days |
| 1912 | 20 days |
| 1913 | 21 days |
| 1914 | 19 days |
| 1915 | 24 days |
| 1916 | 24 days |
| 1917 | 27 days |
| 1918 | 19 days |
| 1919 | 19 days |
| 1920 | 22 days |
| 1921 | 23 days |
| 1922 | 21 days |
| 1923 | 25 days |
| 1924 | 31 days |
| 1925 | 22 days |
| 1926 | 28 days |
| 1927 | 20 days |
| 1928 | 31 days |
| 1929 | 23 days |
| 1930 | 24 days |
| 1931 | 39 days |
| 1932 | 19 days |
| 1933 | 16 days |
| 1934 | 19 days |
| 1935 | 41 days |
| 1936 | 47 days |
| 1937 | 13 days |
| 1938 | 32 days |
| 1939 | 26 days |
| 1940 | 20 days |
| 1941 | 19 days |
| 1942 | 28 days |
| 1943 | 27 days |
| 1944 | 26 days |
| 1945 | 17 days |
| 1946 | 27 days |
| 1947 | 34 days |
| 1948 | 13 days |
| 1949 | 18 days |
| 1950 | 14 days |
| 1951 | 27 days |
| 1952 | 31 days |
| 1953 | 48 days |
| 1954 | 34 days |
| 1955 | 23 days |
| 1956 | 21 days |
| 1957 | 17 days |
| 1958 | 16 days |
| 1959 | 23 days |
| 1960 | 18 days |
| 1961 | 22 days |
| 1962 | 31 days |
| 1963 | 33 days |
| 1964 | 27 days |
| 1965 | 27 days |
| 1966 | 18 days |
| 1967 | 14 days |
| 1968 | 15 days |
| 1969 | 31 days |
| 1970 | 22 days |
| 1971 | 23 days |
| 1972 | 23 days |
| 1973 | 15 days |
| 1974 | 23 days |
| 1975 | 23 days |
| 1976 | 24 days |
| 1977 | 23 days |
| 1978 | 27 days |
| 1979 | 15 days |
| 1980 | 42 days |
| 1981 | 37 days |
| 1982 | 20 days |
| 1983 | 21 days |
| 1984 | 14 days |
| 1985 | 18 days |
| 1986 | 23 days |
| 1987 | 30 days |
| 1988 | 26 days |
| 1989 | 17 days |
| 1990 | 28 days |
| 1991 | 29 days |
| 1992 | 14 days |
| 1993 | 19 days |
| 1994 | 14 days |
| 1995 | 42 days |
| 1996 | 18 days |
| 1997 | 20 days |
| 1998 | 30 days |
| 1999 | 42 days |
| 2000 | 41 days |
| 2001 | 23 days |
| 2002 | 21 days |
| 2003 | 17 days |
| 2004 | 40 days |
| 2005 | 25 days |
| 2006 | 30 days |
| 2007 | 35 days |
| 2008 | 32 days |
| 2009 | 27 days |
| 2010 | 33 days |
| 2011 | 24 days |
| 2012 | 28 days |
| 2013 | 23 days |
| 2014 | 21 days |
| 2015 | 60 days |
| 2016 | 22 days |
| 2017 | 20 days |
| 2018 | 17 days |
| 2019 | 23 days |
| 2020 | 15 days |
| 2021 | 26 days |
| 2023 | 23 days |
| 2024 | 31 days |
| 2025 | 36 days |
| 2026 | 27 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
89 years with a frostAcross 89 years with a frost, the median last spring frost at Helena falls on 22 March and the median first autumn frost on 10 November, which leaves a median of 229 days between them.
In 1984 to 2024 the median growing season was 239 days. That is 12 days more than in 1904 to 1947.
Fitted over all years, the growing season changes by +1.4 days per decade at this station.
| Measure | Median, all years | Earliest period (1904 to 1947) | Recent period (1984 to 2024) | Recent against earliest | Fitted trend |
|---|---|---|---|---|---|
| Last spring frost | 22 March | 28 March | 18 March | 10 days earlier | -0.2 days per decade |
| First autumn frost | 10 November | 10 November | 14 November | 4 days later | +1.2 days per decade |
| Growing days | 229 days | 227 days | 239 days | 12 days more | +1.4 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
119 years, 1893 to 2020A day with at least 83.0 mm (3.3 in) of rain is expected about once in 2 years. A day with at least 191.1 mm (7.5 in) of rain is expected about once in 100 years.
| Expected about once in | A day with at least | Note |
|---|---|---|
| 2 years | 83.0 mm (3.3 in) | |
| 5 years | 108.7 mm (4.3 in) | |
| 10 years | 127.0 mm (5.0 in) | |
| 25 years | 151.5 mm (6.0 in) | |
| 50 years | 170.9 mm (6.7 in) | |
| 100 years | 191.1 mm (7.5 in) |
The levels come from a generalised extreme value (GEV) distribution fitted by L-moments to the wettest-day total of each year, 119 years of values from 1893 to 2020.
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: 255.3 mm (10.1 in) in 1893; 193.0 mm (7.6 in) in 1974; 147.3 mm (5.8 in) in 1927.
Station Changes
2 suspected2 changes were suspected in the annual mean temperature of Helena, at 1985 and 2015. Each is measured against neighbouring stations.
- Relative to 5 neighbouring stations, the station's annual mean temperature from 1985 ran 0.5 C (0.8 F) higher than in the years before (likely change).
- Relative to 5 neighbouring stations, the station's annual mean temperature from 2015 ran 0.3 C (0.5 F) lower than in the years before (possible change).
| Year | Shift (C) | Shift (F) | Strength | Neighbours |
|---|---|---|---|---|
| 1985 | +0.5 | +0.8 | likely | 5 |
| 2015 | -0.3 | -0.5 | possible | 5 |
Possible change at the station (a move, a new instrument or a new site); the record is kept as measured. A "likely" change has a larger test statistic than a "possible" one. Neither says why the station differs from its neighbours. How changes are found, and the largest ones.
Climate Twins
2003 to 2024 against 1961 to 1990Over 2003 to 2024, Helena had a mean temperature of 17.3 C (63.1 F) and 1,142.2 mm (45.0 in) of rain a year. The 3 stations whose 1961 to 1990 climate was closest to that are Mt Pleasant (United States, 435 km away), Paris (United States, 467 km away) and Sulphur Springs (United States, 490 km away).
| Twin station | Country | Distance away | Mean temperature, 1961-1990 | Rain a year, 1961-1990 | Climate difference |
|---|---|---|---|---|---|
| Mt Pleasant | United States | 435 km (270 mi) | 17.1 C (62.8 F) | 1,177.7 mm (46.4 in) | 0.49 |
| Paris | United States | 467 km (290 mi) | 17.3 C (63.2 F) | 1,163.3 mm (45.8 in) | 0.50 |
| Sulphur Springs | United States | 490 km (304 mi) | 17.2 C (62.9 F) | 1,154.6 mm (45.5 in) | 0.56 |
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 2026-10-14 (14 October 2026). Records are computed by this site and are not official.
Data as of . Last revised (2026-10-14).