Hermiston Muni climate by month
Averages and records for each calendar month at Hermiston Muni, United States, from 1998 to 2026. The warmest month is July, averaging 33.9°C; the coolest is December at 5.3°C.
| Month | Avg high | Avg low | Record high | Record low | Years |
|---|---|---|---|---|---|
| January | 5.8°C | −2.1°C | 20.0°C31 January 2020 | −24.3°C13 January 2017 | 28 / 28 |
| February | 9.1°C | −2.2°C | 21.7°C10 February 2022 | −18.2°C6 February 2019 | 28 / 28 |
| March | 14.8°C | 0.5°C | 26.7°C19 March 2024 | −17.7°C5 March 2019 | 28 / 29 |
| April | 18.8°C | 3.0°C | 32.2°C30 April 1998 | −8.8°C1 April 2008 | 29 / 29 |
| May | 24.1°C | 7.5°C | 37.8°C18 May 2006 | −4.3°C1 May 2013 | 29 / 29 |
| June | 28.4°C | 11.4°C | 47.8°C29 June 2021 | 3.3°C1 June 2004 | 29 / 29 |
| July | 33.9°C | 14.8°C | 44.4°C29 July 2022 | 3.3°C4 July 2012 | 29 / 29 |
| August | 32.6°C | 13.8°C | 43.3°C4 August 1998 | 3.3°C25 August 2012 | 29 / 29 |
| September | 27.1°C | 9.0°C | 37.8°C1 September 2022 | −3.3°C23 September 2000 | 28 / 29 |
| October | 18.8°C | 3.6°C | 31.1°C6 October 2014 | −13.9°C31 October 2002 | 28 / 28 |
| November | 10.2°C | −0.3°C | 25.6°C6 November 2006 | −22.1°C24 November 2010 | 27 / 28 |
| December | 5.3°C | −2.6°C | 23.9°C15 December 2025 | −26.6°C16 December 2008 | 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 27 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.