Suisun Weather in December
Average highs run from 60°F on December 1 to 55°F on December 31, and lows from 42°F to 40°F. Normal precipitation for the month is 5.40 in over about 10 wet days.
December day by day
The normal high and low for each date, and the record, in °F.
- Normal low
- Normal high
- Record high
- Record low
December at a glance
- Average high
- 57°F
- Average low
- 40°F
- Precipitation
- 5.40 in
- Record high
- 76°FDec 20, 1999
- Record low
- 17°FDec 23, 1998
- Chance of a freeze
- 63%
- Daylight
- 9 h 42 min to 9 h 33 min
- Cloud cover
- 60%
- Humidity
- 79%
- Dew point
- 40°F
- Wind
- 6.9 mph
Every day of the month
A wet day has at least 0.01 inch of precipitation.
| Date | Normal high | Normal low | Record high | Record low | Chance wet |
|---|---|---|---|---|---|
| Dec 1 | 60°F | 42°F | 70°F 2021 | 29°F 2007 | 29% |
| Dec 2 | 59°F | 42°F | 73°F 2011 | 28°F 2022 | 30% |
| Dec 3 | 59°F | 41°F | 68°F 2023 | 31°F 2004 | 30% |
| Dec 4 | 59°F | 41°F | 70°F 2020 | 24°F 2013 | 30% |
| Dec 5 | 58°F | 41°F | 69°F 2017 | 23°F 2013 | 31% |
| Dec 6 | 58°F | 41°F | 69°F 2014 | 20°F 2013 | 31% |
| Dec 7 | 58°F | 41°F | 73°F 2020 | 27°F 2013 | 31% |
| Dec 8 | 58°F | 41°F | 73°F 2024 | 25°F 2013 | 31% |
| Dec 9 | 58°F | 41°F | 70°F 2012 | 23°F 2013 | 32% |
| Dec 10 | 57°F | 40°F | 70°F 2020 | 21°F 2013 | 32% |
| Dec 11 | 57°F | 40°F | 68°F 2017 | 23°F 2013 | 32% |
| Dec 12 | 57°F | 40°F | 69°F 2023 | 23°F 2013 | 32% |
| Dec 13 | 57°F | 40°F | 66°F 2023 | 26°F 2013 | 32% |
| Dec 14 | 57°F | 40°F | 67°F 2006 | 27°F 2011 | 32% |
| Dec 15 | 56°F | 40°F | 69°F 1998 | 27°F 2013 | 33% |
| Dec 16 | 56°F | 40°F | 68°F 1998 | 29°F 2013 | 33% |
| Dec 17 | 56°F | 40°F | 67°F 2017 | 28°F 2006 | 33% |
| Dec 18 | 56°F | 40°F | 64°F 2013 | 26°F 2022 | 33% |
| Dec 19 | 56°F | 40°F | 75°F 1999 | 26°F 2012 | 33% |
| Dec 20 | 56°F | 40°F | 76°F 1999 | 26°F 2006 | 33% |
| Dec 21 | 56°F | 40°F | 75°F 1999 | 20°F 1998 | 33% |
| Dec 22 | 56°F | 40°F | 70°F 1999 | 20°F 1998 | 33% |
| Dec 23 | 56°F | 40°F | 65°F 2005 | 17°F 1998 | 33% |
| Dec 24 | 56°F | 40°F | 72°F 2013 | 18°F 1998 | 33% |
| Dec 25 | 56°F | 40°F | 66°F 1999 | 23°F 1998 | 33% |
| Dec 26 | 55°F | 40°F | 67°F 2013 | 24°F 2011 | 33% |
| Dec 27 | 55°F | 40°F | 68°F 1999 | 24°F 2015 | 33% |
| Dec 28 | 55°F | 40°F | 73°F 2013 | 26°F 2013 | 33% |
| Dec 29 | 55°F | 40°F | 67°F 2023 | 29°F 1998 | 33% |
| Dec 30 | 55°F | 40°F | 66°F 2002 | 27°F 2015 | 33% |
| Dec 31 | 55°F | 40°F | 72°F 2002 | 25°F 2015 | 33% |
Chance of rain
- Chance of a wet day
Sunrise and sunset
Times for 2026, local time (PST).
- December 1
- sunrise 7:06 AM, sunset 4:48 PM
- December 31
- sunrise 7:25 AM, sunset 4:58 PM
Other months
Sources
Normals: NOAA NCEI U.S. Climate Normals, 1991-2020, station USC00042934 (Fairfield), public domain. Records: NOAA GHCN-Daily, station USW00093241, every year on file, quality-flagged values removed. Cloud, humidity, wind and sunshine: NASA POWER (MERRA-2, CERES and GEWEX SRB), 1991-2020. The data was obtained from the National Aeronautics and Space Administration (NASA) Langley Research Center's Prediction Of Worldwide Energy Resources (POWER) project funded through the NASA Earth Science Division: POWER Daily API v2, accessed 2026-09-24. Sun and moon: computed with the NOAA solar equations and Meeus.