Fort Sill/Post AAF weather by month
Averages and records for each calendar month at Fort Sill/Post AAF, United States, from 1949 to 2026. The warmest month is August, averaging 34.9°C; the coolest is January at 9.9°C.
| Month | Avg high | Avg low | Record high | Record low | Years |
|---|---|---|---|---|---|
| January | 9.9°C | −2.3°C | 28.3°C24 January 1950 | −18.3°C11 January 1962 | 22 / 24 |
| February | 13.1°C | 0.5°C | 29.4°C24 February 1956 | −16.7°C1 February 1951 | 23 / 24 |
| March | 17.2°C | 4.1°C | 36.0°C21 March 2026 | −12.2°C3 March 1960 | 23 / 24 |
| April | 22.9°C | 10.5°C | 36.1°C6 April 1954 | −4.4°C13 April 1957 | 23 / 24 |
| May | 27.1°C | 15.3°C | 40.6°C21 May 1953 | 1.7°C3 May 1954 | 23 / 24 |
| June | 31.8°C | 20.2°C | 44.4°C14 June 1953 | 10.0°C4 June 1954 | 23 / 24 |
| July | 34.8°C | 22.4°C | 42.8°C25 July 1954 | 13.9°C8 July 1952 | 23 / 24 |
| August | 34.9°C | 21.8°C | 43.2°C18 August 2026 | 12.2°C21 August 1956 | 23 / 24 |
| September | 30.1°C | 17.5°C | 42.2°C1 September 1951 | 6.1°C28 September 1964 | 22 / 24 |
| October | 24.4°C | 11.2°C | 37.8°C3 October 1951 | −3.3°C27 October 1957 | 21 / 22 |
| November | 16.7°C | 4.0°C | 30.0°C14 November 2025 | −10.6°C17 November 1959 | 22 / 23 |
| December | 11.6°C | −0.4°C | 30.6°C24 December 1955 | −15.0°C7 December 1950 | 21 / 22 |
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 21 to 23 years each.
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Climate at nearby stations
The closest stations with twelve months of archive of their own, nearest first.
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.