Petaluma Muni climate by month
Averages and records for each calendar month at Petaluma Muni, United States, from 1893 to 2026. The warmest month is July, averaging 27.7°C; the coolest is January at 14.0°C.
| Month | Avg high | Avg low | Record high | Record low | Years |
|---|---|---|---|---|---|
| January | 14.0°C | 3.2°C | 29.4°C8 January 1962 | −7.8°C1 January 1919 | 110 / 111 |
| February | 16.4°C | 4.5°C | 31.7°C16 February 1913 | −7.8°C7 February 1989 | 108 / 112 |
| March | 18.1°C | 5.3°C | 33.9°C17 March 1914 | −4.4°C6 March 1918 | 113 / 113 |
| April | 20.0°C | 6.4°C | 36.1°C29 April 1981 | −4.4°C24 April 1971 | 108 / 113 |
| May | 22.3°C | 8.1°C | 38.3°C29 May 1950 | −2.8°C10 May 1985 | 111 / 113 |
| June | 25.7°C | 10.0°C | 43.3°C2 June 1960 | 0.0°C1 June 1930 | 112 / 112 |
| July | 27.7°C | 10.9°C | 43.3°C14 July 1972 | 3.9°C1 July 1919 | 110 / 113 |
| August | 27.6°C | 11.0°C | 40.6°C31 August 1950 | 3.9°C5 August 1916 | 110 / 111 |
| September | 27.5°C | 10.5°C | 42.8°C16 September 1913 | −0.6°C19 September 1929 | 106 / 114 |
| October | 24.4°C | 8.4°C | 41.1°C2 October 1980 | −3.9°C30 October 1948 | 110 / 111 |
| November | 18.9°C | 5.2°C | 32.8°C17 November 1932 | −6.7°C14 November 1916 | 108 / 111 |
| December | 14.3°C | 3.5°C | 27.2°C26 December 1967 | −8.9°C14 December 1932 | 107 / 111 |
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 106 to 113 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.