McClellan AFB climate by month
Averages and records for each calendar month at McClellan AFB, United States, from 1949 to 2026. The warmest month is July, averaging 34.5°C; the coolest is January at 11.7°C.
| Month | Avg high | Avg low | Record high | Record low | Years |
|---|---|---|---|---|---|
| January | 11.7°C | 3.5°C | 23.9°C8 January 1962 | −6.1°C11 January 1949 | 24 / 24 |
| February | 15.3°C | 5.6°C | 23.9°C27 February 1954 | −2.8°C13 February 1949 | 24 / 24 |
| March | 18.1°C | 6.5°C | 31.0°C18 March 2026 | −2.8°C7 March 1964 | 24 / 24 |
| April | 21.9°C | 8.5°C | 34.4°C10 April 1951 | 1.1°C24 April 1964 | 24 / 24 |
| May | 26.3°C | 11.3°C | 39.4°C29 May 1950 | 2.2°C1 May 1967 | 24 / 24 |
| June | 30.8°C | 14.1°C | 43.3°C15 June 1961 | 6.7°C12 June 1952 | 24 / 24 |
| July | 34.5°C | 16.1°C | 42.8°C10 July 1961 | 8.9°C8 July 1963 | 24 / 24 |
| August | 33.7°C | 16.0°C | 43.3°C19 August 1950 | 9.4°C31 August 1966 | 24 / 24 |
| September | 30.8°C | 14.6°C | 43.3°C2 September 1950 | 5.0°C19 September 1965 | 23 / 24 |
| October | 25.2°C | 10.9°C | 38.9°C1 October 1970 | 1.7°C24 October 1956 | 23 / 23 |
| November | 17.7°C | 7.3°C | 30.6°C2 November 1967 | −2.8°C17 November 1961 | 23 / 23 |
| December | 11.8°C | 4.5°C | 24.4°C28 December 1967 | −5.0°C17 December 1965 | 23 / 23 |
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 23 to 24 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.