Mullan Pass climate by month
Averages and records for each calendar month at Mullan Pass, United States, from 1938 to 2026. The warmest month is July, averaging 20.9°C; the coolest is January at −3.4°C.
| Month | Avg high | Avg low | Record high | Record low | Years |
|---|---|---|---|---|---|
| January | −3.4°C | −8.2°C | 11.1°C19 January 2009 | −31.6°C12 January 2024 | 49 / 49 |
| February | −2.8°C | −8.1°C | 11.7°C5 February 2026 | −28.9°C8 February 1939 | 47 / 49 |
| March | 0.2°C | −6.1°C | 16.1°C30 March 1942 | −27.2°C4 March 1955 | 47 / 48 |
| April | 4.8°C | −2.8°C | 23.9°C20 April 1942 | −16.7°C19 April 1951 | 48 / 49 |
| May | 10.2°C | 1.9°C | 26.7°C21 May 1942 | −12.8°C1 May 1954 | 49 / 49 |
| June | 14.1°C | 5.3°C | 32.2°C29 June 2021 | −5.5°C10 June 2008 | 47 / 49 |
| July | 20.9°C | 11.0°C | 33.3°C12 July 1940 | −2.2°C1 July 1955 | 48 / 49 |
| August | 20.1°C | 10.3°C | 33.9°C9 August 1942 | −0.6°C31 August 1999 | 47 / 49 |
| September | 14.5°C | 6.1°C | 29.4°C3 September 1950 | −8.3°C22 September 2000 | 47 / 50 |
| October | 6.9°C | 0.3°C | 24.4°C2 October 1943 | −19.3°C29 October 2019 | 49 / 49 |
| November | −0.2°C | −5.0°C | 15.6°C4 November 1949 | −27.8°C15 November 1955 | 48 / 48 |
| December | −3.2°C | −7.7°C | 7.8°C29 December 1956 | −29.3°C22 December 2022 | 49 / 49 |
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 47 to 49 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.