San Diego/Gillespie Fld climate by month
Averages and records for each calendar month at San Diego/Gillespie Fld, United States, from 1959 to 1979. The warmest month is August, averaging 31.1°C; the coolest is January at 20.0°C.
| Month | Avg high | Avg low | Record high | Record low | Years |
|---|---|---|---|---|---|
| January | 20.0°C | 3.7°C | 31.1°C1 January 1964 | −5.6°C13 January 1963 | 20 / 20 |
| February | 20.8°C | 5.0°C | 35.6°C3 February 1963 | −4.4°C12 February 1965 | 20 / 20 |
| March | 20.9°C | 6.9°C | 33.3°C31 March 1966 | −1.7°C3 March 1965 | 20 / 20 |
| April | 22.8°C | 8.5°C | 36.1°C28 April 1965 | 1.7°C2 April 1970 | 20 / 20 |
| May | 24.1°C | 11.9°C | 38.9°C29 May 1978 | 3.9°C1 May 1967 | 19 / 19 |
| June | 26.9°C | 14.1°C | 42.2°C27 June 1976 | 5.6°C2 June 1967 | 20 / 20 |
| July | 30.6°C | 16.2°C | 39.4°C20 July 1960 | 8.9°C3 July 1963 | 20 / 20 |
| August | 31.1°C | 17.1°C | 42.2°C22 August 1969 | 10.0°C22 August 1968 | 19 / 19 |
| September | 29.8°C | 15.6°C | 43.9°C25 September 1963 | 6.7°C21 September 1978 | 18 / 19 |
| October | 27.3°C | 11.5°C | 39.4°C14 October 1961 | −1.1°C30 October 1971 | 18 / 19 |
| November | 23.2°C | 7.1°C | 35.6°C1 November 1966 | −2.2°C15 November 1964 | 20 / 20 |
| December | 20.0°C | 3.8°C | 31.7°C1 December 1959 | −5.6°C14 December 1964 | 20 / 20 |
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 18 to 20 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.