Renton Muni climate by month
Averages and records for each calendar month at Renton Muni, United States, from 1998 to 2026. The warmest month is July, averaging 25.6°C; the coolest is December at 8.4°C.
| Month | Avg high | Avg low | Record high | Record low | Years |
|---|---|---|---|---|---|
| January | 8.9°C | 2.8°C | 17.8°C19 January 2005 | −8.2°C12 January 2024 | 28 / 28 |
| February | 9.9°C | 2.7°C | 18.9°C17 February 2016 | −7.7°C10 February 2019 | 28 / 28 |
| March | 12.3°C | 4.2°C | 26.1°C19 March 2019 | −3.8°C11 March 2009 | 28 / 28 |
| April | 15.3°C | 6.2°C | 30.6°C18 April 2016 | −0.5°C3 April 2007 | 28 / 28 |
| May | 19.0°C | 9.5°C | 33.3°C14 May 2023 | 2.8°C10 May 1999 | 28 / 28 |
| June | 22.0°C | 12.3°C | 42.8°C28 June 2021 | 6.7°C8 June 2002 | 27 / 28 |
| July | 25.6°C | 14.5°C | 40.6°C29 July 2009 | 9.4°C5 July 2000 | 27 / 28 |
| August | 25.6°C | 14.7°C | 36.7°C16 August 2020 | 8.3°C24 August 2003 | 28 / 28 |
| September | 22.1°C | 12.1°C | 32.8°C10 September 2020 | 4.4°C23 September 2000 | 26 / 28 |
| October | 16.2°C | 8.2°C | 30.0°C16 October 2022 | −2.2°C31 October 2003 | 26 / 28 |
| November | 11.3°C | 4.6°C | 23.9°C3 November 2010 | −9.9°C24 November 2010 | 27 / 28 |
| December | 8.4°C | 2.7°C | 20.0°C10 December 2014 | −9.4°C20 December 1998 | 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 26 to 28 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.