Mountain Home AFB climate by month
Averages and records for each calendar month at Mountain Home AFB, United States, from 2002 to 2026. The warmest month is July, averaging 36.2°C; the coolest is January at 3.9°C.
| Month | Avg high | Avg low | Record high | Record low | Years |
|---|---|---|---|---|---|
| January | 3.9°C | −4.7°C | 17.2°C30 January 2018 | −27.2°C6 January 2017 | 24 / 24 |
| February | 7.7°C | −3.2°C | 18.9°C15 February 2011 | −15.0°C12 February 2025 | 24 / 24 |
| March | 13.5°C | −0.3°C | 29.4°C20 March 2026 | −10.0°C10 March 2022 | 24 / 24 |
| April | 17.4°C | 1.9°C | 32.8°C22 April 2012 | −8.3°C21 April 2008 | 24 / 24 |
| May | 23.3°C | 6.5°C | 41.1°C28 May 2003 | −5.0°C1 May 2019 | 24 / 25 |
| June | 29.3°C | 11.0°C | 44.4°C28 June 2015 | 0.0°C6 June 2012 | 25 / 25 |
| July | 36.2°C | 16.0°C | 45.6°C12 July 2002 | 6.1°C2 July 2020 | 24 / 25 |
| August | 34.1°C | 14.3°C | 43.3°C2 August 2024 | 3.3°C31 August 2006 | 23 / 24 |
| September | 28.6°C | 8.9°C | 41.7°C7 September 2022 | −1.7°C30 September 2019 | 22 / 23 |
| October | 19.3°C | 3.0°C | 36.1°C2 October 2010 | −12.8°C30 October 2019 | 22 / 22 |
| November | 10.0°C | −2.3°C | 28.9°C7 November 2006 | −17.2°C16 November 2014 | 22 / 22 |
| December | 4.5°C | −4.4°C | 18.9°C11 December 2025 | −22.8°C9 December 2009 | 22 / 22 |
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 22 to 25 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.