Miles City/Wiley Fld weather by month
Averages and records for each calendar month at Miles City/Wiley Fld, United States, from 1937 to 2026. The warmest month is July, averaging 31.8°C; the coolest is January at −2.1°C.
| Month | Avg high | Avg low | Record high | Record low | Years |
|---|---|---|---|---|---|
| January | −2.1°C | −13.5°C | 22.2°C31 January 1992 | −38.3°C25 January 1957 | 89 / 90 |
| February | 0.7°C | −11.3°C | 22.8°C27 February 1992 | −38.3°C10 February 1939 | 90 / 90 |
| March | 7.2°C | −5.6°C | 28.3°C29 March 1943 | −34.9°C3 March 2019 | 90 / 90 |
| April | 14.6°C | 0.8°C | 33.3°C21 April 1980 | −16.6°C3 April 2020 | 90 / 90 |
| May | 20.6°C | 6.7°C | 37.8°C29 May 1988 | −9.4°C3 May 1954 | 90 / 90 |
| June | 26.0°C | 11.8°C | 43.9°C26 June 2012 | 0.0°C3 June 1943 | 90 / 90 |
| July | 31.8°C | 15.8°C | 46.1°C12 July 2026 | 5.0°C1 July 1945 | 90 / 90 |
| August | 30.7°C | 14.6°C | 43.3°C7 August 1949 | 1.7°C22 August 1966 | 90 / 90 |
| September | 23.9°C | 8.4°C | 41.1°C1 September 1983 | −7.2°C21 September 1995 | 89 / 90 |
| October | 16.0°C | 1.8°C | 35.0°C2 October 1997 | −22.2°C30 October 1991 | 89 / 89 |
| November | 6.3°C | −5.7°C | 27.2°C12 November 1999 | −31.7°C28 November 1985 | 89 / 89 |
| December | 0.1°C | −11.3°C | 21.1°C1 December 2021 | −38.9°C24 December 1983 | 88 / 88 |
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 88 to 90 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.