Fairfield weather by month
Measured at Vacaville/Nut Tree Arpt
Averages and records for each calendar month at Vacaville/Nut Tree Arpt, United States, from 1998 to 2026. The warmest month is July, averaging 34.9°C; the coolest is December at 14.2°C.
| Month | Avg high | Avg low | Record high | Record low | Years |
|---|---|---|---|---|---|
| January | 14.5°C | 3.4°C | 25.6°C12 January 2009 | −7.7°C17 January 2012 | 28 / 28 |
| February | 17.0°C | 4.7°C | 29.4°C15 February 2016 | −4.3°C24 February 2018 | 28 / 28 |
| March | 19.7°C | 6.5°C | 32.2°C20 March 2026 | −1.7°C8 March 2002 | 28 / 28 |
| April | 22.7°C | 8.0°C | 36.1°C21 April 2009 | −0.5°C6 April 2024 | 28 / 29 |
| May | 27.1°C | 11.0°C | 41.1°C31 May 2001 | 1.1°C10 May 2022 | 29 / 29 |
| June | 32.0°C | 14.1°C | 44.4°C28 June 2009 | 6.1°C8 June 1999 | 29 / 29 |
| July | 34.9°C | 15.5°C | 46.1°C10 July 2021 | 9.4°C12 July 2001 | 28 / 29 |
| August | 34.4°C | 15.0°C | 43.9°C15 August 2020 | 8.9°C23 August 2002 | 28 / 28 |
| September | 32.1°C | 13.5°C | 46.1°C5 September 2022 | 5.0°C29 September 2019 | 28 / 29 |
| October | 26.4°C | 9.9°C | 40.0°C1 October 2001 | 0.6°C31 October 2019 | 28 / 28 |
| November | 18.9°C | 5.6°C | 31.7°C3 November 2018 | −3.9°C29 November 2015 | 28 / 28 |
| December | 14.2°C | 3.4°C | 24.4°C20 December 1999 | −8.3°C23 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 28 to 29 years each.
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Climate at nearby stations
The closest stations with twelve months of archive of their own, nearest first.
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.