Olympia Rgnl climate by month
Averages and records for each calendar month at Olympia Rgnl, United States, from 1941 to 2026. The warmest month is July, averaging 25.4°C; the coolest is January at 7.2°C.
| Month | Avg high | Avg low | Record high | Record low | Years |
|---|---|---|---|---|---|
| January | 7.2°C | 0.0°C | 17.8°C19 January 2005 | −22.2°C1 January 1979 | 85 / 85 |
| February | 9.4°C | 0.2°C | 22.8°C27 February 1986 | −18.3°C1 February 1950 | 85 / 85 |
| March | 11.9°C | 1.0°C | 26.1°C29 March 2004 | −12.8°C3 March 1989 | 85 / 85 |
| April | 15.0°C | 2.6°C | 31.1°C18 April 2016 | −5.0°C1 April 1975 | 85 / 85 |
| May | 18.9°C | 5.5°C | 35.6°C28 May 1983 | −3.9°C1 May 1954 | 85 / 86 |
| June | 21.7°C | 8.3°C | 43.3°C28 June 2021 | −1.1°C3 June 1976 | 86 / 86 |
| July | 25.4°C | 9.9°C | 40.0°C29 July 2009 | 1.7°C3 July 1962 | 86 / 86 |
| August | 25.3°C | 10.0°C | 40.0°C9 August 1981 | 0.6°C18 August 1973 | 86 / 86 |
| September | 22.1°C | 7.7°C | 36.7°C2 September 1988 | −3.9°C27 September 1972 | 85 / 86 |
| October | 15.9°C | 4.5°C | 32.2°C1 October 1987 | −10.0°C31 October 2002 | 85 / 85 |
| November | 10.3°C | 2.0°C | 23.3°C4 November 1949 | −18.3°C15 November 1955 | 85 / 85 |
| December | 7.2°C | 0.5°C | 17.8°C1 December 1958 | −21.7°C23 December 1983 | 85 / 85 |
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 85 to 86 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.