Butte weather by month
Measured at Butte/Mooney Arpt
Averages and records for each calendar month at Butte/Mooney Arpt, United States, from 1894 to 2026. The warmest month is July, averaging 26.8°C; the coolest is January at −0.9°C.
| Month | Avg high | Avg low | Record high | Record low | Years |
|---|---|---|---|---|---|
| January | −0.9°C | −13.7°C | 14.4°C29 January 1931 | −44.4°C7 January 1937 | 129 / 130 |
| February | 1.3°C | −11.9°C | 16.1°C24 February 1921 | −46.7°C9 February 1933 | 130 / 130 |
| March | 5.2°C | −7.8°C | 21.1°C20 March 2026 | −37.8°C10 March 1948 | 129 / 129 |
| April | 10.6°C | −2.8°C | 28.3°C25 April 1910 | −26.7°C8 April 1982 | 129 / 130 |
| May | 15.8°C | 1.5°C | 32.2°C28 May 1919 | −12.8°C8 May 1965 | 128 / 129 |
| June | 20.9°C | 5.5°C | 36.1°C26 June 1919 | −5.6°C6 June 1916 | 130 / 130 |
| July | 26.8°C | 8.3°C | 37.8°C22 July 1931 | −2.2°C7 July 1971 | 129 / 130 |
| August | 25.8°C | 7.3°C | 37.2°C12 August 1940 | −5.0°C25 August 1992 | 131 / 131 |
| September | 19.7°C | 2.7°C | 35.6°C3 September 2022 | −16.1°C24 September 1926 | 129 / 131 |
| October | 13.0°C | −2.0°C | 29.4°C3 October 2010 | −30.6°C30 October 1991 | 129 / 129 |
| November | 4.8°C | −7.8°C | 21.1°C12 November 1999 | −41.1°C13 November 1959 | 128 / 129 |
| December | −0.2°C | −12.4°C | 18.9°C27 December 1917 | −46.7°C23 December 1983 | 129 / 130 |
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 128 to 131 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.