SIOUX FALLS FOSS FIELD weather by month
Averages and records for each calendar month at SIOUX FALLS FOSS FIELD, United States, from 1932 to 2026. The warmest month is July, averaging 29.9°C; the coolest is January at −3.6°C.
| Month | Avg high | Avg low | Record high | Record low | Years |
|---|---|---|---|---|---|
| January | −3.6°C | −14.5°C | 18.9°C24 January 1981 | −37.8°C19 January 1970 | 95 / 95 |
| February | −0.9°C | −12.0°C | 21.1°C23 February 1958 | −35.0°C28 February 1962 | 95 / 95 |
| March | 6.0°C | −5.2°C | 31.7°C21 March 2026 | −30.6°C11 March 1948 | 95 / 95 |
| April | 14.7°C | 1.6°C | 34.4°C25 April 1962 | −15.6°C3 April 1936 | 95 / 95 |
| May | 21.5°C | 8.2°C | 40.0°C30 May 1934 | −8.3°C4 May 1967 | 95 / 95 |
| June | 26.9°C | 14.0°C | 43.3°C21 June 1988 | 0.6°C1 June 1956 | 95 / 95 |
| July | 29.9°C | 17.0°C | 43.3°C17 July 1936 | 3.3°C4 July 1967 | 95 / 95 |
| August | 28.4°C | 15.7°C | 42.8°C24 August 1936 | 1.1°C20 August 1950 | 95 / 95 |
| September | 23.6°C | 10.1°C | 40.0°C6 September 1976 | −5.6°C30 September 1974 | 93 / 94 |
| October | 16.4°C | 3.2°C | 35.0°C1 October 2023 | −12.8°C19 October 1972 | 94 / 94 |
| November | 6.5°C | −4.8°C | 27.8°C6 November 2020 | −27.2°C14 November 1959 | 94 / 94 |
| December | −1.1°C | −11.4°C | 17.2°C1 December 1998 | −33.3°C23 December 1990 | 94 / 94 |
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 93 to 95 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.