Fairfield Muni climate by month
Averages and records for each calendar month at Fairfield Muni, United States, from 1893 to 2026. The warmest month is July, averaging 30.7°C; the coolest is January at 0.0°C.
| Month | Avg high | Avg low | Record high | Record low | Years |
|---|---|---|---|---|---|
| January | 0.0°C | −10.1°C | 21.1°C23 January 1909 | −33.9°C22 January 1930 | 127 / 128 |
| February | 2.5°C | −7.9°C | 25.6°C28 February 2024 | −35.0°C3 February 1996 | 127 / 128 |
| March | 9.4°C | −2.0°C | 31.7°C22 March 2026 | −26.1°C1 March 1962 | 126 / 126 |
| April | 17.1°C | 4.5°C | 33.9°C11 April 1896 | −12.8°C6 April 1982 | 126 / 127 |
| May | 23.1°C | 10.5°C | 38.9°C31 May 1934 | −3.3°C7 May 1931 | 126 / 126 |
| June | 28.2°C | 15.8°C | 40.0°C29 June 1934 | 2.2°C6 June 1894 | 125 / 127 |
| July | 30.7°C | 18.0°C | 45.6°C15 July 1936 | 6.1°C18 July 1911 | 125 / 126 |
| August | 29.5°C | 16.8°C | 45.0°C9 August 1934 | 1.7°C31 August 1915 | 125 / 127 |
| September | 25.4°C | 12.5°C | 39.4°C4 September 1925 | −5.0°C28 September 1942 | 123 / 127 |
| October | 18.6°C | 6.0°C | 35.6°C2 October 1953 | −17.2°C30 October 1925 | 123 / 124 |
| November | 9.8°C | −0.9°C | 27.2°C1 November 1938 | −21.1°C30 November 1929 | 125 / 125 |
| December | 2.3°C | −7.0°C | 23.3°C16 December 2021 | −32.8°C26 December 1914 | 125 / 125 |
Years shows the number behind the average high, then the number holding a record for that month. They differ because a year contributes an average only when the month has at least 25 days of readings, while a single reading is enough to set a record. The average low is withheld on the same 25-day rule and is counted separately again; it is shown as a dash where the archive cannot support it. Across the twelve months here the averages rest on 123 to 127 years each.
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Every figure on this page is computed from NOAA GHCN-Daily observations stored per station, per year, per month. Nothing is modelled, interpolated or estimated, and a month the archive never covered is left out rather than filled in. A station appears here only once all twelve months carry an average from at least 10 years. See how this is built.