Washington Muni climate by month
Averages and records for each calendar month at Washington Muni, United States, from 1893 to 2026. The warmest month is July, averaging 30.5°C; the coolest is January at −0.3°C.
| Month | Avg high | Avg low | Record high | Record low | Years |
|---|---|---|---|---|---|
| January | −0.3°C | −10.5°C | 21.1°C31 January 1989 | −35.6°C16 January 2009 | 133 / 134 |
| February | 2.2°C | −8.5°C | 26.7°C28 February 2024 | −33.9°C13 February 1905 | 131 / 134 |
| March | 9.3°C | −2.3°C | 31.7°C29 March 1986 | −26.7°C1 March 1962 | 132 / 133 |
| April | 17.1°C | 4.1°C | 34.4°C10 April 1930 | −13.9°C1 April 1899 | 132 / 134 |
| May | 23.1°C | 10.3°C | 39.4°C31 May 1934 | −5.0°C3 May 2005 | 133 / 134 |
| June | 28.1°C | 15.7°C | 41.7°C29 June 1936 | 1.7°C12 June 1903 | 134 / 134 |
| July | 30.5°C | 17.9°C | 45.0°C15 July 1936 | 7.2°C22 July 1947 | 133 / 133 |
| August | 29.3°C | 16.6°C | 42.8°C3 August 1930 | 3.9°C31 August 1915 | 132 / 133 |
| September | 25.5°C | 12.1°C | 38.9°C9 September 1933 | −5.0°C28 September 1942 | 131 / 134 |
| October | 19.0°C | 5.7°C | 35.6°C4 October 1938 | −14.4°C30 October 1925 | 131 / 133 |
| November | 9.7°C | −1.3°C | 27.8°C2 November 2016 | −21.7°C26 November 1898 | 130 / 132 |
| December | 2.1°C | −7.5°C | 23.3°C16 December 2021 | −31.7°C28 December 1924 | 131 / 131 |
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 130 to 134 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.