Chester Weather Records (USC00241692)
Record envelope, standing records and threshold days for Chester (USC00241692), Montana, United States, with 127 years of record.
Key Facts for Chester
- Chester (USC00241692) is a weather station in Montana, United States at 48.51 latitude and -110.97 longitude, 955 m (3,132 ft) above sea level.
- The station reports from 1900 to 2026, 127 years of record.
- 1,464 records set at Chester still stand.
- Records are tracked for tmax, tmin, prcp, snow, snwd: an element needs 30 years of data to be eligible.
- Chester set a daily record precipitation of 23.1 mm (0.9 in) on 8 September 2026 (provisional).
Provisional Records
Records set in the last 60 days are provisional until they clear the revision window.
About the Station
- Location: Montana, United States, 48.51 latitude, -110.97 longitude.
- Elevation: 955 m (3,132 ft).
- Period of record: 1900 to 2026, 127 years.
- Eligible elements: tmax, tmin, prcp, snow, snwd.
Daily Record Envelope and 2026
14 days at or beyond a record| Month | Highest record high | Lowest record low | 2026 highest maximum | 2026 lowest minimum |
|---|---|---|---|---|
| Jan | 18.9 C (66.0 F) | -49.4 C (-56.9 F) | 16.1 C (61.0 F) | -30.0 C (-22.0 F) |
| Feb | 23.3 C (73.9 F) | -42.2 C (-44.0 F) | 21.7 C (71.1 F) | -27.2 C (-17.0 F) |
| Mar | 26.1 C (79.0 F) | -38.9 C (-38.0 F) | 23.3 C (73.9 F) | -20.6 C (-5.1 F) |
| Apr | 31.1 C (88.0 F) | -28.3 C (-18.9 F) | 28.3 C (82.9 F) | -10.6 C (12.9 F) |
| May | 34.4 C (93.9 F) | -13.3 C (8.1 F) | 32.8 C (91.0 F) | -7.8 C (18.0 F) |
| Jun | 38.3 C (100.9 F) | -7.2 C (19.0 F) | 27.8 C (82.0 F) | 3.9 C (39.0 F) |
| Jul | 40.0 C (104.0 F) | -1.1 C (30.0 F) | 35.6 C (96.1 F) | 8.3 C (46.9 F) |
| Aug | 40.6 C (105.1 F) | -2.2 C (28.0 F) | 38.3 C (100.9 F) | 3.3 C (37.9 F) |
| Sep | 37.2 C (99.0 F) | -13.3 C (8.1 F) | 31.1 C (88.0 F) | -3.3 C (26.1 F) |
| Oct | 32.2 C (90.0 F) | -27.2 C (-17.0 F) | 27.8 C (82.0 F) | 3.9 C (39.0 F) |
| Nov | 25.0 C (77.0 F) | -36.1 C (-33.0 F) | n/a | n/a |
| Dec | 26.7 C (80.1 F) | -46.7 C (-52.1 F) | n/a | n/a |
Which Years Hold Standing Records
1,464 standing records| Year set | Standing records |
|---|---|
| 1900 | 11 |
| 1901 | 7 |
| 1902 | 6 |
| 1903 | 5 |
| 1904 | 16 |
| 1905 | 13 |
| 1906 | 19 |
| 1907 | 12 |
| 1908 | 6 |
| 1909 | 22 |
| 1911 | 25 |
| 1912 | 6 |
| 1913 | 21 |
| 1914 | 22 |
| 1915 | 12 |
| 1916 | 19 |
| 1917 | 12 |
| 1918 | 23 |
| 1919 | 25 |
| 1920 | 4 |
| 1942 | 5 |
| 1943 | 41 |
| 1944 | 18 |
| 1945 | 10 |
| 1946 | 12 |
| 1947 | 10 |
| 1948 | 12 |
| 1949 | 18 |
| 1950 | 24 |
| 1951 | 23 |
| 1952 | 11 |
| 1953 | 11 |
| 1954 | 24 |
| 1955 | 16 |
| 1956 | 20 |
| 1957 | 19 |
| 1958 | 12 |
| 1959 | 12 |
| 1960 | 8 |
| 1961 | 18 |
| 1962 | 32 |
| 1963 | 16 |
| 1964 | 12 |
| 1965 | 13 |
| 1966 | 11 |
| 1967 | 23 |
| 1968 | 19 |
| 1969 | 18 |
| 1970 | 6 |
| 1971 | 6 |
| 1972 | 24 |
| 1973 | 12 |
| 1974 | 9 |
| 1975 | 7 |
| 1976 | 8 |
| 1977 | 17 |
| 1978 | 6 |
| 1979 | 6 |
| 1980 | 17 |
| 1981 | 12 |
| 1982 | 3 |
| 1983 | 15 |
| 1984 | 18 |
| 1985 | 26 |
| 1986 | 18 |
| 1987 | 20 |
| 1988 | 16 |
| 1989 | 7 |
| 1990 | 20 |
| 1991 | 23 |
| 1992 | 30 |
| 1993 | 10 |
| 1994 | 7 |
| 1995 | 12 |
| 1996 | 8 |
| 1997 | 8 |
| 1998 | 6 |
| 1999 | 11 |
| 2000 | 7 |
| 2001 | 6 |
| 2002 | 13 |
| 2003 | 19 |
| 2004 | 10 |
| 2005 | 10 |
| 2006 | 3 |
| 2007 | 13 |
| 2008 | 8 |
| 2009 | 17 |
| 2010 | 10 |
| 2011 | 3 |
| 2012 | 12 |
| 2013 | 13 |
| 2014 | 11 |
| 2015 | 13 |
| 2016 | 5 |
| 2017 | 4 |
| 2018 | 7 |
| 2019 | 23 |
| 2020 | 11 |
| 2021 | 20 |
| 2022 | 23 |
| 2023 | 18 |
| 2024 | 13 |
| 2025 | 16 |
| 2026 | 14 |
All-Time Record Progression
5 new records| Date | Kind | Detail |
|---|---|---|
| 1961-08-05 | Record high maximum temperature | Record high maximum temperature 40.6 C (105.1 F) |
| 1968-12-29 | Record low maximum temperature | Record low maximum temperature -35.6 C (-32.1 F) |
| 1970-07-13 | Record daily precipitation | Record daily precipitation 78.7 mm (3.1 in) |
| 2007-04-11 | Record daily snowfall | Record daily snowfall 24.1 cm (9.5 in) |
| 2017-10-03 | Record daily snowfall | Record daily snowfall 45.7 cm (18.0 in) |
Wettest Day of Each Month
Jul: 78.7 mm (3.1 in)| Month | Record daily precipitation (mm) | Date |
|---|---|---|
| Jan | 20.8 mm (0.8 in) | 31 January 1911 |
| Feb | 17.0 mm (0.7 in) | 8 February 2018 |
| Mar | 47.5 mm (1.9 in) | 24 March 1908 |
| Apr | 46.5 mm (1.8 in) | 15 April 2016 |
| May | 41.1 mm (1.6 in) | 25 May 1990 |
| Jun | 76.7 mm (3.0 in) | 6 June 1995 |
| Jul | 78.7 mm (3.1 in) | 13 July 1970 |
| Aug | 56.4 mm (2.2 in) | 15 August 1968 |
| Sep | 59.7 mm (2.4 in) | 4 September 1911 |
| Oct | 45.2 mm (1.8 in) | 3 October 2017 |
| Nov | 27.7 mm (1.1 in) | 2 November 2020 |
| Dec | 17.8 mm (0.7 in) | 13 December 2025 |
Period of Record Coverage
1900 to 2026| Year | Days with data | Share of year | Complete |
|---|---|---|---|
| 1900 | 184 | 50% | No |
| 1901 | 364 | 100% | Yes |
| 1902 | 180 | 49% | No |
| 1903 | 61 | 17% | No |
| 1904 | 314 | 86% | No |
| 1905 | 143 | 39% | No |
| 1906 | 355 | 97% | Yes |
| 1907 | 361 | 99% | Yes |
| 1908 | 294 | 80% | No |
| 1909 | 178 | 49% | No |
| 1910 | 30 | 8% | No |
| 1911 | 358 | 98% | Yes |
| 1912 | 363 | 99% | Yes |
| 1913 | 358 | 98% | Yes |
| 1914 | 306 | 84% | No |
| 1915 | 303 | 83% | No |
| 1916 | 311 | 85% | No |
| 1917 | 149 | 41% | No |
| 1918 | 125 | 34% | No |
| 1919 | 153 | 42% | No |
| 1920 | 17 | 5% | No |
| 1942 | 125 | 34% | No |
| 1943 | 359 | 98% | Yes |
| 1944 | 364 | 99% | Yes |
| 1945 | 359 | 98% | Yes |
| 1946 | 362 | 99% | Yes |
| 1947 | 352 | 96% | Yes |
| 1948 | 318 | 87% | No |
| 1949 | 327 | 90% | No |
| 1950 | 272 | 75% | No |
| 1951 | 297 | 81% | No |
| 1952 | 345 | 94% | Yes |
| 1953 | 340 | 93% | Yes |
| 1954 | 344 | 94% | Yes |
| 1955 | 315 | 86% | No |
| 1956 | 364 | 99% | Yes |
| 1957 | 361 | 99% | Yes |
| 1958 | 359 | 98% | Yes |
| 1959 | 364 | 100% | Yes |
| 1960 | 364 | 99% | Yes |
| 1961 | 364 | 100% | Yes |
| 1962 | 364 | 100% | Yes |
| 1963 | 364 | 100% | Yes |
| 1964 | 359 | 98% | Yes |
| 1965 | 363 | 99% | Yes |
| 1966 | 365 | 100% | Yes |
| 1967 | 362 | 99% | Yes |
| 1968 | 359 | 98% | Yes |
| 1969 | 362 | 99% | Yes |
| 1970 | 361 | 99% | Yes |
| 1971 | 363 | 99% | Yes |
| 1972 | 364 | 99% | Yes |
| 1973 | 364 | 100% | Yes |
| 1974 | 365 | 100% | Yes |
| 1975 | 362 | 99% | Yes |
| 1976 | 362 | 99% | Yes |
| 1977 | 364 | 100% | Yes |
| 1978 | 363 | 99% | Yes |
| 1979 | 363 | 99% | Yes |
| 1980 | 365 | 100% | Yes |
| 1981 | 364 | 100% | Yes |
| 1982 | 358 | 98% | Yes |
| 1983 | 351 | 96% | Yes |
| 1984 | 360 | 98% | Yes |
| 1985 | 353 | 97% | Yes |
| 1986 | 360 | 99% | Yes |
| 1987 | 348 | 95% | Yes |
| 1988 | 357 | 98% | Yes |
| 1989 | 261 | 72% | No |
| 1990 | 358 | 98% | Yes |
| 1991 | 350 | 96% | Yes |
| 1992 | 327 | 89% | No |
| 1993 | 350 | 96% | Yes |
| 1994 | 345 | 95% | Yes |
| 1995 | 354 | 97% | Yes |
| 1996 | 359 | 98% | Yes |
| 1997 | 358 | 98% | Yes |
| 1998 | 361 | 99% | Yes |
| 1999 | 362 | 99% | Yes |
| 2000 | 334 | 91% | Yes |
| 2001 | 364 | 100% | Yes |
| 2002 | 364 | 100% | Yes |
| 2003 | 361 | 99% | Yes |
| 2004 | 363 | 99% | Yes |
| 2005 | 330 | 90% | Yes |
| 2006 | 133 | 36% | No |
| 2007 | 363 | 99% | Yes |
| 2008 | 365 | 100% | Yes |
| 2009 | 364 | 100% | Yes |
| 2010 | 365 | 100% | Yes |
| 2011 | 364 | 100% | Yes |
| 2012 | 366 | 100% | Yes |
| 2013 | 358 | 98% | Yes |
| 2014 | 364 | 100% | Yes |
| 2015 | 347 | 95% | Yes |
| 2016 | 249 | 68% | No |
| 2017 | 244 | 67% | No |
| 2018 | 255 | 70% | No |
| 2019 | 297 | 81% | No |
| 2020 | 336 | 92% | Yes |
| 2021 | 347 | 95% | Yes |
| 2022 | 363 | 99% | Yes |
| 2023 | 361 | 99% | Yes |
| 2024 | 366 | 100% | Yes |
| 2025 | 364 | 100% | Yes |
| 2026 | 276 | 76% | No |
Latest Records
20| Date | Station | Record | Value | Beat old record by | Old record stood | Significance |
|---|---|---|---|---|---|---|
| 8 September 2026 | Chester, US | daily rain (Provisional) | 23.1 mm (0.9 in) | 16.0 mm (0.6 in) | 80 years | 20 of 100 (Routine) |
| 22 August 2026 | Chester, US | daily high min (Tie, Provisional) | 18.3 C (64.9 F) | tie | 4 years | 2 of 100 (Routine) |
| 21 August 2026 | Chester, US | daily high min (Provisional) | 17.2 C (63.0 F) | 1.1 C (2.0 F) | 28 years | 20 of 100 (Routine) |
| 15 August 2026 | Chester, US | daily low max (Provisional) | 15.0 C (59.0 F) | 2.8 C (5.0 F) | 81 years | 40 of 100 (Notable) |
| 2 August 2026 | Chester, US | daily high max | 38.3 C (100.9 F) | 0.5 C (0.9 F) | 112 years | 41 of 100 (Notable) |
| 2 August 2026 | Chester, US | daily high min (Tie) | 20.0 C (68.0 F) | tie | 4 years | 2 of 100 (Routine) |
| 29 June 2026 | Chester, US | daily rain | 30.7 mm (1.2 in) | 7.3 mm (0.29 in) | 44 years | 32 of 100 (Routine) |
| 1 June 2026 | Chester, US | daily low max | 11.1 C (52.0 F) | 0.6 C (1.1 F) | 124 years | 41 of 100 (Notable) |
| 29 May 2026 | Chester, US | daily high max (Tie) | 32.2 C (90.0 F) | tie | 68 years | 7 of 100 (Routine) |
| 27 May 2026 | Chester, US | daily high max (Tie) | 32.8 C (91.0 F) | tie | 60 years | 7 of 100 (Routine) |
| 18 May 2026 | Chester, US | daily rain | 7.1 mm (0.28 in) | 0.5 mm (0.02 in) | 64 years | 20 of 100 (Routine) |
| 6 May 2026 | Chester, US | daily low min | -7.8 C (18.0 F) | 1.1 C (2.0 F) | 124 years | 42 of 100 (Notable) |
| 27 April 2026 | Chester, US | daily low min | -10.6 C (12.9 F) | 0.6 C (1.1 F) | 64 years | 30 of 100 (Routine) |
| 25 April 2026 | Chester, US | daily snowfall | 5.3 cm (2.1 in) | 5.3 cm (2.1 in) | 124 years | 49 of 100 (Notable) |
| 25 April 2026 | Chester, US | daily snow depth | 2.5 cm (1.0 in) | 2.5 cm (1.0 in) | 115 years | 20 of 100 (Routine) |
| 25 April 2026 | Chester, US | daily low max | 1.1 C (34.0 F) | 1.7 C (3.1 F) | 59 years | 29 of 100 (Routine) |
| 21 March 2026 | Chester, US | daily high max | 23.3 C (73.9 F) | 3.3 C (5.9 F) | 52 years | 29 of 100 (Routine) |
| 20 March 2026 | Chester, US | daily high max | 21.7 C (71.1 F) | 0.6 C (1.1 F) | 115 years | 40 of 100 (Notable) |
| 19 March 2026 | Chester, US | daily high max (Tie) | 20.6 C (69.1 F) | tie | 1 year | 2 of 100 (Routine) |
| 9 March 2026 | Chester, US | daily snowfall | 2.8 cm (1.1 in) | 1.0 cm (0.4 in) | 23 years | 19 of 100 (Routine) |
Climate Trend
71 complete years, 1901 to 2025| Year | Annual mean temperature | Difference from the station mean |
|---|---|---|
| 1901 | 5.2 C | -0.25 C |
| 1906 | 5.0 C | -0.46 C |
| 1907 | 3.4 C | -2.08 C |
| 1911 | 3.0 C | -2.42 C |
| 1912 | 4.2 C | -1.30 C |
| 1944 | 6.7 C | +1.28 C |
| 1945 | 4.9 C | -0.60 C |
| 1946 | 4.3 C | -1.12 C |
| 1947 | 5.9 C | +0.45 C |
| 1949 | 5.1 C | -0.36 C |
| 1952 | 5.4 C | -0.07 C |
| 1953 | 6.6 C | +1.11 C |
| 1954 | 5.0 C | -0.43 C |
| 1956 | 4.3 C | -1.18 C |
| 1957 | 4.9 C | -0.54 C |
| 1958 | 5.4 C | -0.05 C |
| 1959 | 4.5 C | -0.99 C |
| 1960 | 4.8 C | -0.71 C |
| 1961 | 6.0 C | +0.54 C |
| 1962 | 5.9 C | +0.39 C |
| 1963 | 6.4 C | +0.98 C |
| 1964 | 5.0 C | -0.44 C |
| 1965 | 3.6 C | -1.89 C |
| 1966 | 4.4 C | -1.04 C |
| 1967 | 5.0 C | -0.44 C |
| 1968 | 5.0 C | -0.43 C |
| 1969 | 4.1 C | -1.37 C |
| 1970 | 4.3 C | -1.20 C |
| 1971 | 5.0 C | -0.50 C |
| 1972 | 3.9 C | -1.58 C |
| 1973 | 5.7 C | +0.25 C |
| 1974 | 6.3 C | +0.83 C |
| 1975 | 4.3 C | -1.21 C |
| 1976 | 7.1 C | +1.66 C |
| 1978 | 4.0 C | -1.48 C |
| 1979 | 5.2 C | -0.28 C |
| 1980 | 5.9 C | +0.48 C |
| 1981 | 7.4 C | +1.89 C |
| 1982 | 4.1 C | -1.33 C |
| 1983 | 6.0 C | +0.58 C |
| 1984 | 6.2 C | +0.74 C |
| 1985 | 4.6 C | -0.83 C |
| 1986 | 6.9 C | +1.41 C |
| 1987 | 7.9 C | +2.40 C |
| 1988 | 7.3 C | +1.80 C |
| 1990 | 6.3 C | +0.86 C |
| 1991 | 6.9 C | +1.42 C |
| 1993 | 4.6 C | -0.86 C |
| 1994 | 5.7 C | +0.28 C |
| 1995 | 5.0 C | -0.49 C |
| 1996 | 3.7 C | -1.80 C |
| 1997 | 5.9 C | +0.45 C |
| 1998 | 7.1 C | +1.60 C |
| 1999 | 7.3 C | +1.82 C |
| 2001 | 6.6 C | +1.13 C |
| 2002 | 5.3 C | -0.21 C |
| 2003 | 6.1 C | +0.61 C |
| 2004 | 6.2 C | +0.78 C |
| 2007 | 6.6 C | +1.16 C |
| 2008 | 5.2 C | -0.31 C |
| 2009 | 4.5 C | -0.96 C |
| 2010 | 4.5 C | -0.94 C |
| 2011 | 4.9 C | -0.57 C |
| 2012 | 6.4 C | +0.92 C |
| 2013 | 6.2 C | +0.70 C |
| 2014 | 5.1 C | -0.33 C |
| 2020 | 5.7 C | +0.26 C |
| 2022 | 5.5 C | +0.02 C |
| 2023 | 7.4 C | +1.96 C |
| 2024 | 7.1 C | +1.65 C |
| 2025 | 6.3 C | +0.84 C |
The annual mean temperature here has risen by 0.2 C (0.1 to 0.2) per decade over 1901 to 2025. In Fahrenheit: 0.3 F (0.1 to 0.4) per decade. The slope is a straight line fitted to 71 complete years; the brackets give its 95 percent interval.
| Measure | Per decade (C) | Per decade (F) | Period | Complete years | Reading |
|---|---|---|---|---|---|
| Annual mean temperature | 0.2 C (0.1 to 0.2) per decade | 0.3 F (0.1 to 0.4) per decade | 1901 to 2025 | 71 | Rise |
| Mean daily maximum | 0.08 C (-0.02 to 0.19) per decade | 0.15 F (-0.04 to 0.33) per decade | 1901 to 2025 | 71 | Not clearly different from zero |
| Mean daily minimum | 0.2 C (0.2 to 0.3) per decade | 0.4 F (0.3 to 0.6) per decade | 1901 to 2025 | 71 | 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
1900 to 2026| Measure | Record | Year of the record | Median year | Years with a value |
|---|---|---|---|---|
| Hottest day (TXx) | 40.6 C (105.1 F) | 1961 | 36.1 C (97.0 F) | 106 |
| Coldest night (TNn) | -49.4 C (-56.9 F) | 1950 | -36.4 C (-33.5 F) | 106 |
| Wettest day (Rx1day) | 78.7 mm (3.1 in) | 1970 | 27.9 mm (1.1 in) | 106 |
| Wettest five days (Rx5day) | 107.7 mm (4.2 in) | 1995 | 44.5 mm (1.8 in) | 106 |
| Longest dry spell (CDD) | 109 days | 1949 | 41 days | 106 |
Hottest day (TXx)
| Year | Hottest day (TXx) |
|---|---|
| 1900 | 39.4 C (102.9 F) |
| 1901 | 36.7 C (98.1 F) |
| 1902 | 32.2 C (90.0 F) |
| 1903 | 32.2 C (90.0 F) |
| 1904 | 36.1 C (97.0 F) |
| 1905 | 24.4 C (75.9 F) |
| 1906 | 36.7 C (98.1 F) |
| 1907 | 30.6 C (87.1 F) |
| 1908 | 36.1 C (97.0 F) |
| 1909 | 33.3 C (91.9 F) |
| 1910 | 5.6 C (42.1 F) |
| 1911 | 35.6 C (96.1 F) |
| 1912 | 36.7 C (98.1 F) |
| 1913 | 35.6 C (96.1 F) |
| 1914 | 37.8 C (100.0 F) |
| 1915 | 34.4 C (93.9 F) |
| 1916 | 32.8 C (91.0 F) |
| 1917 | 32.2 C (90.0 F) |
| 1918 | 35.6 C (96.1 F) |
| 1919 | 39.4 C (102.9 F) |
| 1920 | 34.4 C (93.9 F) |
| 1942 | 31.1 C (88.0 F) |
| 1943 | 36.1 C (97.0 F) |
| 1944 | 36.7 C (98.1 F) |
| 1945 | 37.2 C (99.0 F) |
| 1946 | 35.6 C (96.1 F) |
| 1947 | 37.2 C (99.0 F) |
| 1948 | 35.6 C (96.1 F) |
| 1949 | 40.0 C (104.0 F) |
| 1950 | 36.1 C (97.0 F) |
| 1951 | 38.3 C (100.9 F) |
| 1952 | 36.7 C (98.1 F) |
| 1953 | 39.4 C (102.9 F) |
| 1954 | 36.1 C (97.0 F) |
| 1955 | 36.7 C (98.1 F) |
| 1956 | 35.0 C (95.0 F) |
| 1957 | 36.7 C (98.1 F) |
| 1958 | 35.6 C (96.1 F) |
| 1959 | 36.1 C (97.0 F) |
| 1960 | 39.4 C (102.9 F) |
| 1961 | 40.6 C (105.1 F) |
| 1962 | 34.4 C (93.9 F) |
| 1963 | 36.7 C (98.1 F) |
| 1964 | 36.7 C (98.1 F) |
| 1965 | 35.0 C (95.0 F) |
| 1966 | 34.4 C (93.9 F) |
| 1967 | 35.6 C (96.1 F) |
| 1968 | 35.6 C (96.1 F) |
| 1969 | 38.9 C (102.0 F) |
| 1970 | 35.6 C (96.1 F) |
| 1971 | 36.7 C (98.1 F) |
| 1972 | 34.4 C (93.9 F) |
| 1973 | 36.7 C (98.1 F) |
| 1974 | 35.0 C (95.0 F) |
| 1975 | 37.2 C (99.0 F) |
| 1976 | 34.4 C (93.9 F) |
| 1977 | 35.0 C (95.0 F) |
| 1978 | 35.0 C (95.0 F) |
| 1979 | 35.6 C (96.1 F) |
| 1980 | 34.4 C (93.9 F) |
| 1981 | 37.2 C (99.0 F) |
| 1982 | 33.3 C (91.9 F) |
| 1983 | 38.9 C (102.0 F) |
| 1984 | 36.7 C (98.1 F) |
| 1985 | 36.1 C (97.0 F) |
| 1986 | 35.0 C (95.0 F) |
| 1987 | 35.6 C (96.1 F) |
| 1988 | 36.1 C (97.0 F) |
| 1989 | 36.1 C (97.0 F) |
| 1990 | 37.8 C (100.0 F) |
| 1991 | 37.8 C (100.0 F) |
| 1992 | 35.0 C (95.0 F) |
| 1993 | 34.4 C (93.9 F) |
| 1994 | 35.6 C (96.1 F) |
| 1995 | 32.2 C (90.0 F) |
| 1996 | 35.6 C (96.1 F) |
| 1997 | 35.6 C (96.1 F) |
| 1998 | 36.1 C (97.0 F) |
| 1999 | 36.1 C (97.0 F) |
| 2000 | 38.3 C (100.9 F) |
| 2001 | 37.8 C (100.0 F) |
| 2002 | 39.4 C (102.9 F) |
| 2003 | 36.7 C (98.1 F) |
| 2004 | 36.1 C (97.0 F) |
| 2005 | 35.0 C (95.0 F) |
| 2006 | 36.7 C (98.1 F) |
| 2007 | 40.0 C (104.0 F) |
| 2008 | 35.6 C (96.1 F) |
| 2009 | 35.0 C (95.0 F) |
| 2010 | 36.7 C (98.1 F) |
| 2011 | 37.2 C (99.0 F) |
| 2012 | 35.0 C (95.0 F) |
| 2013 | 33.9 C (93.0 F) |
| 2014 | 34.4 C (93.9 F) |
| 2015 | 36.7 C (98.1 F) |
| 2016 | 34.4 C (93.9 F) |
| 2017 | 36.1 C (97.0 F) |
| 2018 | 38.9 C (102.0 F) |
| 2019 | 33.9 C (93.0 F) |
| 2020 | 35.6 C (96.1 F) |
| 2021 | 36.1 C (97.0 F) |
| 2022 | 37.2 C (99.0 F) |
| 2023 | 36.1 C (97.0 F) |
| 2024 | 40.0 C (104.0 F) |
| 2025 | 35.0 C (95.0 F) |
| 2026 | 38.3 C (100.9 F) |
Coldest night (TNn)
| Year | Coldest night (TNn) |
|---|---|
| 1900 | -36.1 C (-33.0 F) |
| 1901 | -36.1 C (-33.0 F) |
| 1902 | -36.7 C (-34.1 F) |
| 1903 | -6.7 C (19.9 F) |
| 1904 | -33.3 C (-27.9 F) |
| 1905 | -42.2 C (-44.0 F) |
| 1906 | -36.1 C (-33.0 F) |
| 1907 | -41.1 C (-42.0 F) |
| 1908 | -35.0 C (-31.0 F) |
| 1909 | -48.3 C (-54.9 F) |
| 1910 | -21.7 C (-7.1 F) |
| 1911 | -38.3 C (-36.9 F) |
| 1912 | -33.3 C (-27.9 F) |
| 1913 | -40.6 C (-41.1 F) |
| 1914 | -40.0 C (-40.0 F) |
| 1915 | -27.8 C (-18.0 F) |
| 1916 | -41.1 C (-42.0 F) |
| 1917 | -41.7 C (-43.1 F) |
| 1918 | -7.2 C (19.0 F) |
| 1919 | -35.6 C (-32.1 F) |
| 1920 | -20.6 C (-5.1 F) |
| 1942 | -29.4 C (-20.9 F) |
| 1943 | -43.3 C (-45.9 F) |
| 1944 | -30.6 C (-23.1 F) |
| 1945 | -32.2 C (-26.0 F) |
| 1946 | -36.1 C (-33.0 F) |
| 1947 | -37.8 C (-36.0 F) |
| 1948 | -34.4 C (-29.9 F) |
| 1949 | -39.4 C (-38.9 F) |
| 1950 | -49.4 C (-56.9 F) |
| 1951 | -38.9 C (-38.0 F) |
| 1952 | -38.9 C (-38.0 F) |
| 1953 | -25.6 C (-14.1 F) |
| 1954 | -42.2 C (-44.0 F) |
| 1955 | -38.9 C (-38.0 F) |
| 1956 | -41.7 C (-43.1 F) |
| 1957 | -42.2 C (-44.0 F) |
| 1958 | -37.2 C (-35.0 F) |
| 1959 | -35.0 C (-31.0 F) |
| 1960 | -37.2 C (-35.0 F) |
| 1961 | -36.1 C (-33.0 F) |
| 1962 | -38.3 C (-36.9 F) |
| 1963 | -34.4 C (-29.9 F) |
| 1964 | -41.1 C (-42.0 F) |
| 1965 | -31.1 C (-24.0 F) |
| 1966 | -36.1 C (-33.0 F) |
| 1967 | -33.9 C (-29.0 F) |
| 1968 | -42.8 C (-45.0 F) |
| 1969 | -42.8 C (-45.0 F) |
| 1970 | -33.9 C (-29.0 F) |
| 1971 | -36.7 C (-34.1 F) |
| 1972 | -42.2 C (-44.0 F) |
| 1973 | -32.8 C (-27.0 F) |
| 1974 | -35.0 C (-31.0 F) |
| 1975 | -35.6 C (-32.1 F) |
| 1976 | -31.7 C (-25.1 F) |
| 1977 | -38.9 C (-38.0 F) |
| 1978 | -37.2 C (-35.0 F) |
| 1979 | -38.9 C (-38.0 F) |
| 1980 | -35.6 C (-32.1 F) |
| 1981 | -31.7 C (-25.1 F) |
| 1982 | -41.1 C (-42.0 F) |
| 1983 | -46.7 C (-52.1 F) |
| 1984 | -34.4 C (-29.9 F) |
| 1985 | -37.2 C (-35.0 F) |
| 1986 | -33.3 C (-27.9 F) |
| 1987 | -28.9 C (-20.0 F) |
| 1988 | -31.1 C (-24.0 F) |
| 1989 | -41.1 C (-42.0 F) |
| 1990 | -42.2 C (-44.0 F) |
| 1991 | -35.6 C (-32.1 F) |
| 1992 | -37.8 C (-36.0 F) |
| 1993 | -35.0 C (-31.0 F) |
| 1994 | -42.2 C (-44.0 F) |
| 1995 | -31.1 C (-24.0 F) |
| 1996 | -42.2 C (-44.0 F) |
| 1997 | -36.1 C (-33.0 F) |
| 1998 | -33.3 C (-27.9 F) |
| 1999 | -29.4 C (-20.9 F) |
| 2000 | -27.8 C (-18.0 F) |
| 2001 | -27.8 C (-18.0 F) |
| 2002 | -34.4 C (-29.9 F) |
| 2003 | -36.1 C (-33.0 F) |
| 2004 | -38.3 C (-36.9 F) |
| 2005 | -37.8 C (-36.0 F) |
| 2006 | -27.2 C (-17.0 F) |
| 2007 | -34.4 C (-29.9 F) |
| 2008 | -37.2 C (-35.0 F) |
| 2009 | -36.7 C (-34.1 F) |
| 2010 | -35.6 C (-32.1 F) |
| 2011 | -37.8 C (-36.0 F) |
| 2012 | -32.8 C (-27.0 F) |
| 2013 | -40.0 C (-40.0 F) |
| 2014 | -37.2 C (-35.0 F) |
| 2015 | -32.8 C (-27.0 F) |
| 2016 | -41.1 C (-42.0 F) |
| 2017 | -38.9 C (-38.0 F) |
| 2018 | -39.4 C (-38.9 F) |
| 2019 | -40.0 C (-40.0 F) |
| 2020 | -26.7 C (-16.1 F) |
| 2021 | -41.1 C (-42.0 F) |
| 2022 | -42.2 C (-44.0 F) |
| 2023 | -28.9 C (-20.0 F) |
| 2024 | -47.8 C (-54.0 F) |
| 2025 | -40.0 C (-40.0 F) |
| 2026 | -30.0 C (-22.0 F) |
Wettest day (Rx1day)
| Year | Wettest day (Rx1day) |
|---|---|
| 1900 | 25.4 mm (1.0 in) |
| 1901 | 27.9 mm (1.1 in) |
| 1902 | 63.5 mm (2.5 in) |
| 1903 | 25.4 mm (1.0 in) |
| 1904 | 12.7 mm (0.5 in) |
| 1905 | 17.8 mm (0.7 in) |
| 1906 | 34.0 mm (1.3 in) |
| 1907 | 57.2 mm (2.3 in) |
| 1908 | 47.5 mm (1.9 in) |
| 1909 | 46.5 mm (1.8 in) |
| 1910 | 5.1 mm (0.20 in) |
| 1911 | 59.7 mm (2.4 in) |
| 1912 | 20.6 mm (0.8 in) |
| 1913 | 25.4 mm (1.0 in) |
| 1914 | 45.7 mm (1.8 in) |
| 1915 | 28.7 mm (1.1 in) |
| 1916 | 39.4 mm (1.6 in) |
| 1917 | 12.7 mm (0.5 in) |
| 1918 | 22.6 mm (0.9 in) |
| 1919 | 18.8 mm (0.7 in) |
| 1920 | 22.6 mm (0.9 in) |
| 1942 | 7.6 mm (0.30 in) |
| 1943 | 34.3 mm (1.4 in) |
| 1944 | 17.0 mm (0.7 in) |
| 1945 | 17.0 mm (0.7 in) |
| 1946 | 29.2 mm (1.1 in) |
| 1947 | 23.6 mm (0.9 in) |
| 1948 | 22.4 mm (0.9 in) |
| 1949 | 13.7 mm (0.5 in) |
| 1950 | 17.8 mm (0.7 in) |
| 1951 | 32.8 mm (1.3 in) |
| 1952 | 25.4 mm (1.0 in) |
| 1953 | 36.8 mm (1.4 in) |
| 1954 | 36.8 mm (1.4 in) |
| 1955 | 20.8 mm (0.8 in) |
| 1956 | 30.2 mm (1.2 in) |
| 1957 | 21.6 mm (0.9 in) |
| 1958 | 29.7 mm (1.2 in) |
| 1959 | 33.5 mm (1.3 in) |
| 1960 | 22.1 mm (0.9 in) |
| 1961 | 18.8 mm (0.7 in) |
| 1962 | 14.7 mm (0.6 in) |
| 1963 | 25.4 mm (1.0 in) |
| 1964 | 29.7 mm (1.2 in) |
| 1965 | 38.6 mm (1.5 in) |
| 1966 | 32.3 mm (1.3 in) |
| 1967 | 15.5 mm (0.6 in) |
| 1968 | 56.4 mm (2.2 in) |
| 1969 | 14.5 mm (0.6 in) |
| 1970 | 78.7 mm (3.1 in) |
| 1971 | 16.5 mm (0.6 in) |
| 1972 | 21.1 mm (0.8 in) |
| 1973 | 20.1 mm (0.8 in) |
| 1974 | 28.7 mm (1.1 in) |
| 1975 | 34.0 mm (1.3 in) |
| 1976 | 43.7 mm (1.7 in) |
| 1977 | 19.6 mm (0.8 in) |
| 1978 | 23.9 mm (0.9 in) |
| 1979 | 28.4 mm (1.1 in) |
| 1980 | 35.1 mm (1.4 in) |
| 1981 | 35.3 mm (1.4 in) |
| 1982 | 26.9 mm (1.1 in) |
| 1983 | 27.7 mm (1.1 in) |
| 1984 | 18.5 mm (0.7 in) |
| 1985 | 30.5 mm (1.2 in) |
| 1986 | 30.0 mm (1.2 in) |
| 1987 | 21.3 mm (0.8 in) |
| 1988 | 18.8 mm (0.7 in) |
| 1989 | 48.8 mm (1.9 in) |
| 1990 | 41.1 mm (1.6 in) |
| 1991 | 31.0 mm (1.2 in) |
| 1992 | 31.8 mm (1.3 in) |
| 1993 | 27.9 mm (1.1 in) |
| 1994 | 10.2 mm (0.4 in) |
| 1995 | 76.7 mm (3.0 in) |
| 1996 | 21.6 mm (0.9 in) |
| 1997 | 43.2 mm (1.7 in) |
| 1998 | 33.3 mm (1.3 in) |
| 1999 | 41.1 mm (1.6 in) |
| 2000 | 15.5 mm (0.6 in) |
| 2001 | 37.6 mm (1.5 in) |
| 2002 | 31.0 mm (1.2 in) |
| 2003 | 28.4 mm (1.1 in) |
| 2004 | 27.9 mm (1.1 in) |
| 2005 | 22.4 mm (0.9 in) |
| 2006 | 12.7 mm (0.5 in) |
| 2007 | 21.6 mm (0.9 in) |
| 2008 | 32.3 mm (1.3 in) |
| 2009 | 27.4 mm (1.1 in) |
| 2010 | 28.4 mm (1.1 in) |
| 2011 | 20.8 mm (0.8 in) |
| 2012 | 27.9 mm (1.1 in) |
| 2013 | 32.3 mm (1.3 in) |
| 2014 | 24.9 mm (1.0 in) |
| 2015 | 29.2 mm (1.1 in) |
| 2016 | 46.5 mm (1.8 in) |
| 2017 | 45.2 mm (1.8 in) |
| 2018 | 33.8 mm (1.3 in) |
| 2019 | 23.1 mm (0.9 in) |
| 2020 | 30.7 mm (1.2 in) |
| 2021 | 28.4 mm (1.1 in) |
| 2022 | 19.1 mm (0.8 in) |
| 2023 | 18.0 mm (0.7 in) |
| 2024 | 30.7 mm (1.2 in) |
| 2025 | 21.8 mm (0.9 in) |
| 2026 | 30.7 mm (1.2 in) |
Wettest five days (Rx5day)
| Year | Wettest five days (Rx5day) |
|---|---|
| 1900 | 38.1 mm (1.5 in) |
| 1901 | 31.8 mm (1.3 in) |
| 1902 | 88.9 mm (3.5 in) |
| 1903 | 25.9 mm (1.0 in) |
| 1904 | 10.2 mm (0.4 in) |
| 1905 | 17.8 mm (0.7 in) |
| 1906 | 55.6 mm (2.2 in) |
| 1907 | 91.0 mm (3.6 in) |
| 1908 | 83.8 mm (3.3 in) |
| 1909 | 57.9 mm (2.3 in) |
| 1910 | 5.1 mm (0.20 in) |
| 1911 | 88.6 mm (3.5 in) |
| 1912 | 45.0 mm (1.8 in) |
| 1913 | 51.3 mm (2.0 in) |
| 1914 | 53.6 mm (2.1 in) |
| 1915 | 66.8 mm (2.6 in) |
| 1916 | 49.4 mm (1.9 in) |
| 1917 | 14.2 mm (0.6 in) |
| 1918 | 22.6 mm (0.9 in) |
| 1919 | 24.4 mm (1.0 in) |
| 1920 | 34.3 mm (1.4 in) |
| 1942 | 10.9 mm (0.4 in) |
| 1943 | 54.1 mm (2.1 in) |
| 1944 | 26.2 mm (1.0 in) |
| 1945 | 26.2 mm (1.0 in) |
| 1946 | 44.9 mm (1.8 in) |
| 1947 | 45.7 mm (1.8 in) |
| 1948 | 50.1 mm (2.0 in) |
| 1949 | 22.8 mm (0.9 in) |
| 1950 | 29.8 mm (1.2 in) |
| 1951 | 61.0 mm (2.4 in) |
| 1952 | 28.4 mm (1.1 in) |
| 1953 | 57.1 mm (2.2 in) |
| 1954 | 51.5 mm (2.0 in) |
| 1955 | 55.1 mm (2.2 in) |
| 1956 | 42.1 mm (1.7 in) |
| 1957 | 29.4 mm (1.2 in) |
| 1958 | 51.6 mm (2.0 in) |
| 1959 | 69.8 mm (2.7 in) |
| 1960 | 44.2 mm (1.7 in) |
| 1961 | 30.2 mm (1.2 in) |
| 1962 | 23.1 mm (0.9 in) |
| 1963 | 30.5 mm (1.2 in) |
| 1964 | 52.6 mm (2.1 in) |
| 1965 | 72.1 mm (2.8 in) |
| 1966 | 47.0 mm (1.9 in) |
| 1967 | 31.5 mm (1.2 in) |
| 1968 | 76.4 mm (3.0 in) |
| 1969 | 37.3 mm (1.5 in) |
| 1970 | 82.5 mm (3.2 in) |
| 1971 | 24.6 mm (1.0 in) |
| 1972 | 31.2 mm (1.2 in) |
| 1973 | 26.2 mm (1.0 in) |
| 1974 | 41.2 mm (1.6 in) |
| 1975 | 59.7 mm (2.4 in) |
| 1976 | 69.6 mm (2.7 in) |
| 1977 | 32.3 mm (1.3 in) |
| 1978 | 37.1 mm (1.5 in) |
| 1979 | 50.2 mm (2.0 in) |
| 1980 | 54.3 mm (2.1 in) |
| 1981 | 43.5 mm (1.7 in) |
| 1982 | 54.8 mm (2.2 in) |
| 1983 | 35.9 mm (1.4 in) |
| 1984 | 24.1 mm (0.9 in) |
| 1985 | 37.8 mm (1.5 in) |
| 1986 | 34.6 mm (1.4 in) |
| 1987 | 41.5 mm (1.6 in) |
| 1988 | 27.9 mm (1.1 in) |
| 1989 | 56.7 mm (2.2 in) |
| 1990 | 70.6 mm (2.8 in) |
| 1991 | 45.7 mm (1.8 in) |
| 1992 | 43.4 mm (1.7 in) |
| 1993 | 51.5 mm (2.0 in) |
| 1994 | 20.4 mm (0.8 in) |
| 1995 | 107.7 mm (4.2 in) |
| 1996 | 32.5 mm (1.3 in) |
| 1997 | 49.3 mm (1.9 in) |
| 1998 | 57.5 mm (2.3 in) |
| 1999 | 52.6 mm (2.1 in) |
| 2000 | 19.8 mm (0.8 in) |
| 2001 | 40.1 mm (1.6 in) |
| 2002 | 69.3 mm (2.7 in) |
| 2003 | 30.9 mm (1.2 in) |
| 2004 | 38.6 mm (1.5 in) |
| 2005 | 80.4 mm (3.2 in) |
| 2006 | 14.6 mm (0.6 in) |
| 2007 | 22.1 mm (0.9 in) |
| 2008 | 58.4 mm (2.3 in) |
| 2009 | 35.2 mm (1.4 in) |
| 2010 | 56.6 mm (2.2 in) |
| 2011 | 36.1 mm (1.4 in) |
| 2012 | 61.9 mm (2.4 in) |
| 2013 | 70.6 mm (2.8 in) |
| 2014 | 61.2 mm (2.4 in) |
| 2015 | 47.0 mm (1.9 in) |
| 2016 | 60.5 mm (2.4 in) |
| 2017 | 52.5 mm (2.1 in) |
| 2018 | 44.7 mm (1.8 in) |
| 2019 | 42.6 mm (1.7 in) |
| 2020 | 46.4 mm (1.8 in) |
| 2021 | 41.0 mm (1.6 in) |
| 2022 | 25.4 mm (1.0 in) |
| 2023 | 37.8 mm (1.5 in) |
| 2024 | 35.8 mm (1.4 in) |
| 2025 | 44.9 mm (1.8 in) |
| 2026 | 71.0 mm (2.8 in) |
Longest dry spell (CDD)
| Year | Longest dry spell (CDD) |
|---|---|
| 1900 | 48 days |
| 1901 | 73 days |
| 1902 | 37 days |
| 1903 | 24 days |
| 1904 | 67 days |
| 1905 | 61 days |
| 1906 | 50 days |
| 1907 | 85 days |
| 1908 | 72 days |
| 1909 | 31 days |
| 1910 | 27 days |
| 1911 | 85 days |
| 1912 | 93 days |
| 1913 | 49 days |
| 1914 | 45 days |
| 1915 | 42 days |
| 1916 | 53 days |
| 1917 | 28 days |
| 1918 | 22 days |
| 1919 | 56 days |
| 1920 | 22 days |
| 1942 | 22 days |
| 1943 | 68 days |
| 1944 | 64 days |
| 1945 | 51 days |
| 1946 | 24 days |
| 1947 | 48 days |
| 1948 | 32 days |
| 1949 | 109 days |
| 1950 | 32 days |
| 1951 | 29 days |
| 1952 | 56 days |
| 1953 | 81 days |
| 1954 | 52 days |
| 1955 | 90 days |
| 1956 | 36 days |
| 1957 | 46 days |
| 1958 | 36 days |
| 1959 | 43 days |
| 1960 | 70 days |
| 1961 | 38 days |
| 1962 | 41 days |
| 1963 | 39 days |
| 1964 | 40 days |
| 1965 | 60 days |
| 1966 | 34 days |
| 1967 | 67 days |
| 1968 | 55 days |
| 1969 | 64 days |
| 1970 | 31 days |
| 1971 | 49 days |
| 1972 | 51 days |
| 1973 | 67 days |
| 1974 | 88 days |
| 1975 | 23 days |
| 1976 | 35 days |
| 1977 | 48 days |
| 1978 | 56 days |
| 1979 | 39 days |
| 1980 | 31 days |
| 1981 | 35 days |
| 1982 | 33 days |
| 1983 | 46 days |
| 1984 | 58 days |
| 1985 | 37 days |
| 1986 | 47 days |
| 1987 | 95 days |
| 1988 | 60 days |
| 1989 | 22 days |
| 1990 | 51 days |
| 1991 | 52 days |
| 1992 | 50 days |
| 1993 | 33 days |
| 1994 | 40 days |
| 1995 | 31 days |
| 1996 | 27 days |
| 1997 | 53 days |
| 1998 | 28 days |
| 1999 | 38 days |
| 2000 | 32 days |
| 2001 | 76 days |
| 2002 | 49 days |
| 2003 | 52 days |
| 2004 | 64 days |
| 2005 | 27 days |
| 2006 | 28 days |
| 2007 | 64 days |
| 2008 | 50 days |
| 2009 | 38 days |
| 2010 | 32 days |
| 2011 | 36 days |
| 2012 | 27 days |
| 2013 | 17 days |
| 2014 | 28 days |
| 2015 | 43 days |
| 2016 | 26 days |
| 2017 | 30 days |
| 2018 | 27 days |
| 2019 | 18 days |
| 2020 | 28 days |
| 2021 | 35 days |
| 2022 | 25 days |
| 2023 | 32 days |
| 2024 | 32 days |
| 2025 | 16 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
71 years with a frostAcross 71 years with a frost, the median last spring frost at Chester falls on 24 May and the median first autumn frost on 13 September, which leaves a median of 110 days between them.
In 1985 to 2025 the median growing season was 125 days. That is 34 days more than in 1901 to 1972.
Fitted over all years, the growing season changes by +4.6 days per decade at this station.
| Measure | Median, all years | Earliest period (1901 to 1972) | Recent period (1985 to 2025) | Recent against earliest | Fitted trend |
|---|---|---|---|---|---|
| Last spring frost | 24 May | 30 May | 21 May | 9 days earlier | -1.7 days per decade |
| First autumn frost | 13 September | 5 September | 20 September | 15 days later | +2.9 days per decade |
| Growing days | 110 days | 91 days | 125 days | 34 days more | +4.6 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
80 years, 1901 to 2025A day with at least 26.6 mm (1.0 in) of rain is expected about once in 2 years. A day with at least 69.8 mm (2.7 in) of rain is expected about once in 100 years.
| Expected about once in | A day with at least | Note |
|---|---|---|
| 2 years | 26.6 mm (1.0 in) | |
| 5 years | 36.5 mm (1.4 in) | |
| 10 years | 43.7 mm (1.7 in) | |
| 25 years | 53.5 mm (2.1 in) | |
| 50 years | 61.4 mm (2.4 in) | |
| 100 years | 69.8 mm (2.7 in) | Longer than the 80 years of record |
The levels come from a generalised extreme value (GEV) distribution fitted by L-moments to the wettest-day total of each year, 80 years of values from 1901 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: 78.7 mm (3.1 in) in 1970; 76.7 mm (3.0 in) in 1995; 59.7 mm (2.4 in) in 1911.
Station Changes
1 suspectedOne change was suspected in the annual mean temperature of Chester, at 1978. Each is measured against neighbouring stations.
- Relative to 5 neighbouring stations, the station's annual mean temperature from 1978 ran 0.3 C (0.5 F) higher than in the years before (possible change).
| Year | Shift (C) | Shift (F) | Strength | Neighbours |
|---|---|---|---|---|
| 1978 | +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 2025 against 1961 to 1990Over 2003 to 2025, Chester had a mean temperature of 5.9 C (42.5 F) and 346.8 mm (13.7 in) of rain a year. The 3 stations whose 1961 to 1990 climate was closest to that are Dubois Exp STN (United States, 484 km away), Terry 21 NNW (United States, 439 km away) and Carlyle 13 NW (United States, 536 km away).
| Twin station | Country | Distance away | Mean temperature, 1961-1990 | Rain a year, 1961-1990 | Climate difference |
|---|---|---|---|---|---|
| Dubois Exp STN | United States | 484 km (301 mi) | 6.0 C (42.8 F) | 325.2 mm (12.8 in) | 0.79 |
| Terry 21 NNW | United States | 439 km (273 mi) | 5.7 C (42.2 F) | 334.9 mm (13.2 in) | 0.86 |
| Carlyle 13 NW | United States | 536 km (333 mi) | 6.3 C (43.3 F) | 386.4 mm (15.2 in) | 0.91 |
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).