Mount Shasta climate by month
Averages and records for each calendar month at Mount Shasta, United States, from 1996 to 2026. The warmest month is July, averaging 31.1°C; the coolest is December at 6.7°C.
| Month | Avg high | Avg low | Record high | Record low | Years |
|---|---|---|---|---|---|
| January | 7.5°C | −2.0°C | 20.0°C6 January 2015 | −16.0°C6 January 2017 | 29 / 30 |
| February | 8.9°C | −1.7°C | 21.7°C27 February 2025 | −14.3°C12 February 2025 | 30 / 30 |
| March | 11.8°C | −0.2°C | 28.3°C17 March 2026 | −9.4°C8 March 2002 | 30 / 30 |
| April | 15.6°C | 1.6°C | 30.6°C21 April 2009 | −7.7°C20 April 2008 | 29 / 30 |
| May | 21.1°C | 5.3°C | 35.0°C17 May 2008 | −5.5°C9 May 2022 | 30 / 30 |
| June | 26.0°C | 8.8°C | 39.4°C27 June 2021 | −0.5°C10 June 2017 | 30 / 30 |
| July | 31.1°C | 11.2°C | 41.1°C29 July 2022 | 2.8°C1 July 1997 | 30 / 30 |
| August | 30.2°C | 10.2°C | 38.9°C14 August 2023 | 2.8°C5 August 2002 | 31 / 31 |
| September | 26.2°C | 7.2°C | 39.4°C6 September 2022 | −1.1°C25 September 2005 | 30 / 31 |
| October | 18.7°C | 3.2°C | 31.7°C1 October 2010 | −8.2°C30 October 2019 | 30 / 30 |
| November | 10.9°C | −0.2°C | 25.6°C1 November 2020 | −11.6°C28 November 2015 | 30 / 30 |
| December | 6.7°C | −2.2°C | 18.9°C13 December 2025 | −17.8°C21 December 1998 | 30 / 30 |
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 29 to 31 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.