Missoula Intl climate by month
Averages and records for each calendar month at Missoula Intl, United States, from 1948 to 2026. The warmest month is July, averaging 29.7°C; the coolest is January at −0.7°C.
| Month | Avg high | Avg low | Record high | Record low | Years |
|---|---|---|---|---|---|
| January | −0.7°C | −9.0°C | 15.0°C9 January 1953 | −36.1°C26 January 1957 | 79 / 79 |
| February | 2.7°C | −6.6°C | 18.9°C24 February 1995 | −32.8°C5 February 1982 | 79 / 79 |
| March | 8.3°C | −3.4°C | 25.6°C30 March 2004 | −25.0°C5 March 1955 | 79 / 79 |
| April | 13.9°C | 0.0°C | 30.6°C28 April 1987 | −10.0°C19 April 1951 | 79 / 79 |
| May | 19.1°C | 4.1°C | 35.0°C30 May 1986 | −6.1°C1 May 1954 | 79 / 79 |
| June | 23.5°C | 7.9°C | 38.9°C28 June 2015 | −1.1°C10 June 1999 | 79 / 79 |
| July | 29.7°C | 10.4°C | 41.7°C6 July 2007 | −0.6°C7 July 1971 | 79 / 79 |
| August | 28.8°C | 9.8°C | 40.6°C4 August 1961 | −1.1°C25 August 1992 | 79 / 79 |
| September | 22.4°C | 5.3°C | 37.2°C1 September 1967 | −6.7°C14 September 1970 | 78 / 79 |
| October | 13.9°C | 0.0°C | 29.4°C3 October 1963 | −21.6°C25 October 2020 | 78 / 78 |
| November | 4.9°C | −4.3°C | 22.8°C12 November 1999 | −30.6°C16 November 1955 | 78 / 78 |
| December | −0.3°C | −8.0°C | 19.4°C1 December 2021 | −34.4°C17 December 1964 | 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.