Bismarck Arpt climate by month
Averages and records for each calendar month at Bismarck Arpt, United States, from 1948 to 2026. The warmest month is July, averaging 29.4°C; the coolest is January at −6.0°C.
| Month | Avg high | Avg low | Record high | Record low | Years |
|---|---|---|---|---|---|
| January | −6.0°C | −17.8°C | 17.2°C8 January 2002 | −42.2°C18 January 1950 | 79 / 79 |
| February | −3.0°C | −14.8°C | 22.8°C27 February 2016 | −41.7°C9 February 1994 | 79 / 79 |
| March | 3.8°C | −8.1°C | 27.2°C25 March 2007 | −35.0°C10 March 1948 | 79 / 79 |
| April | 12.9°C | −0.8°C | 33.9°C21 April 1980 | −24.4°C1 April 1975 | 79 / 79 |
| May | 20.2°C | 5.8°C | 36.1°C12 May 2025 | −9.4°C3 May 1967 | 79 / 79 |
| June | 25.4°C | 11.3°C | 43.9°C29 June 2002 | −1.1°C2 June 1969 | 79 / 79 |
| July | 29.4°C | 14.2°C | 44.4°C30 July 2006 | 1.7°C30 July 1971 | 79 / 79 |
| August | 28.6°C | 12.9°C | 41.7°C9 August 1958 | 0.6°C12 August 1964 | 79 / 79 |
| September | 22.6°C | 7.1°C | 40.6°C8 September 1959 | −11.7°C30 September 1974 | 78 / 79 |
| October | 14.7°C | 0.4°C | 35.0°C1 October 1953 | −23.3°C30 October 1991 | 78 / 78 |
| November | 4.5°C | −7.4°C | 26.1°C7 November 1999 | −34.4°C29 November 1985 | 78 / 78 |
| December | −3.1°C | −14.5°C | 18.9°C1 December 2021 | −41.7°C31 December 1967 | 78 / 78 |
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 78 to 79 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.