Washington Island climate by month
Averages and records for each calendar month at Washington Island, United States, from 1944 to 2025. The warmest month is July, averaging 24.6°C; the coolest is January at −3.4°C.
| Month | Avg high | Avg low | Record high | Record low | Years |
|---|---|---|---|---|---|
| January | −3.4°C | −11.3°C | 9.4°C10 January 2002 | −32.8°C17 January 1982 | 79 / 81 |
| February | −2.1°C | −11.2°C | 13.9°C22 February 2017 | −32.2°C3 February 1996 | 79 / 81 |
| March | 2.7°C | −6.3°C | 21.7°C27 March 1946 | −32.2°C1 March 1962 | 80 / 80 |
| April | 9.0°C | −0.6°C | 25.0°C28 April 1951 | −15.0°C5 April 1972 | 79 / 79 |
| May | 15.4°C | 4.5°C | 30.6°C28 May 1969 | −6.7°C8 May 1950 | 80 / 80 |
| June | 20.9°C | 10.1°C | 33.3°C14 June 1987 | −4.4°C5 June 1946 | 78 / 79 |
| July | 24.6°C | 14.0°C | 34.4°C14 July 1983 | 1.7°C4 July 1972 | 79 / 79 |
| August | 24.1°C | 14.0°C | 36.1°C21 August 1955 | 0.0°C22 August 1950 | 78 / 80 |
| September | 19.7°C | 10.4°C | 34.4°C1 September 1953 | −3.3°C28 September 1976 | 80 / 80 |
| October | 13.2°C | 5.0°C | 28.9°C6 October 1963 | −7.8°C9 October 1989 | 80 / 81 |
| November | 5.8°C | −0.9°C | 21.7°C2 November 1990 | −17.2°C23 November 1950 | 78 / 80 |
| December | −0.3°C | −6.8°C | 14.4°C6 December 2001 | −29.4°C29 December 1976 | 78 / 81 |
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 78 to 80 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.