Pullman/Moscow Rgnl climate by month
Averages and records for each calendar month at Pullman/Moscow Rgnl, United States, from 1998 to 2026. The warmest month is July, averaging 29.0°C; the coolest is December at 2.7°C.
| Month | Avg high | Avg low | Record high | Record low | Years |
|---|---|---|---|---|---|
| January | 3.1°C | −2.7°C | 14.4°C26 January 2015 | −26.1°C4 January 2004 | 28 / 28 |
| February | 4.9°C | −2.5°C | 15.6°C27 February 2005 | −24.9°C12 February 2025 | 28 / 28 |
| March | 9.4°C | −0.1°C | 23.9°C26 March 2025 | −22.7°C4 March 2019 | 28 / 28 |
| April | 13.5°C | 2.0°C | 28.9°C27 April 2018 | −7.7°C13 April 2020 | 28 / 28 |
| May | 18.6°C | 5.7°C | 33.3°C16 May 2006 | −3.3°C10 May 1999 | 28 / 28 |
| June | 22.5°C | 8.4°C | 41.1°C29 June 2021 | −1.1°C7 June 2002 | 28 / 29 |
| July | 29.0°C | 10.3°C | 40.0°C31 July 2021 | 0.6°C11 July 2008 | 29 / 29 |
| August | 28.8°C | 10.3°C | 40.6°C9 August 2018 | 1.1°C21 August 2000 | 29 / 29 |
| September | 23.5°C | 7.3°C | 36.7°C1 September 2025 | −6.1°C23 September 2000 | 28 / 29 |
| October | 15.2°C | 3.0°C | 30.6°C1 October 2008 | −13.3°C31 October 2002 | 28 / 28 |
| November | 7.2°C | −0.1°C | 22.2°C12 November 1999 | −23.2°C24 November 2010 | 28 / 28 |
| December | 2.7°C | −3.2°C | 16.7°C1 December 2021 | −24.3°C17 December 2016 | 28 / 28 |
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 28 to 29 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.