Vallejo weather in December: Vallejo, California: normal highs, lows, rain and records for December
Vallejo in December has a normal high of 58°F and a normal low of 42°F, a daily mean of 50°F, falling from 60°F on the 1st to 57°F by the 31st. The month brings 4.49 inches in all. (NOAA 1991-2020 normals)
In metric: a normal high of 14°C and low of 6°C, 114 mm of precipitation in December.
- NOAA stationVallejo
- Station IDUSC00049219
- Location38.10°N 122.19°W
- Elevation341 ft (104 m)
- From the center4 miles
- Population123,475
- Jan 57° 42°
- Feb 63° 45°
- Mar 68° 46°
- Apr 73° 47°
- May 78° 51°
- Jun 83° 54°
- Jul 85° 56°
- Aug 86° 56°
- Sep 86° 57°
- Oct 79° 54°
- Nov 66° 47°
- Dec 58° 42°
Each month: normal high (large) and low, °F. Fill: the month's normal mean, colder blue to hotter red.
How warm is Vallejo in December?
The normal high is 58°F and the normal low 42°F, for a daily mean of 49.8°F. December is 6.5°F cooler than November and 0.1°F warmer than January. December is the 11th warmest month of the year in Vallejo and the wettest. Across the month the normal high falls 3°F, from 60°F on December 1 to 57°F on December 31.
| Day | High | Low | Chance of 0.01 in | Chance of 0.10 in |
|---|---|---|---|---|
| December 1 | 60°F | 44°F | – | – |
| December 8 | 58°F | 43°F | – | – |
| December 15 | 57°F | 42°F | – | – |
| December 22 | 57°F | 41°F | – | – |
| December 31 | 57°F | 41°F | – | – |
Every day of December: normal high, low and chance of precipitation (warmest afternoon December 1, coldest night December 30)
| Day | High | Low | Chance of 0.01 in | Chance of 0.10 in | Daylight |
|---|---|---|---|---|---|
| December 1 | 60°F | 44°F | – | – | 9 h 40 min |
| December 2 | 60°F | 44°F | – | – | 9 h 40 min |
| December 3 | 59°F | 44°F | – | – | 9 h 40 min |
| December 4 | 59°F | 44°F | – | – | 9 h 40 min |
| December 5 | 59°F | 43°F | – | – | 9 h 40 min |
| December 6 | 59°F | 43°F | – | – | 9 h 40 min |
| December 7 | 59°F | 43°F | – | – | 9 h 40 min |
| December 8 | 58°F | 43°F | – | – | 9 h 40 min |
| December 9 | 58°F | 43°F | – | – | 9 h 40 min |
| December 10 | 58°F | 43°F | – | – | 9 h 40 min |
| December 11 | 58°F | 42°F | – | – | 9 h 30 min |
| December 12 | 58°F | 42°F | – | – | 9 h 30 min |
| December 13 | 58°F | 42°F | – | – | 9 h 30 min |
| December 14 | 58°F | 42°F | – | – | 9 h 30 min |
| December 15 | 57°F | 42°F | – | – | 9 h 30 min |
| December 16 | 57°F | 42°F | – | – | 9 h 30 min |
| December 17 | 57°F | 42°F | – | – | 9 h 30 min |
| December 18 | 57°F | 42°F | – | – | 9 h 30 min |
| December 19 | 57°F | 41°F | – | – | 9 h 30 min |
| December 20 | 57°F | 41°F | – | – | 9 h 30 min |
| December 21 | 57°F | 41°F | – | – | 9 h 30 min |
| December 22 | 57°F | 41°F | – | – | 9 h 30 min |
| December 23 | 57°F | 41°F | – | – | 9 h 30 min |
| December 24 | 57°F | 41°F | – | – | 9 h 30 min |
| December 25 | 57°F | 41°F | – | – | 9 h 30 min |
| December 26 | 57°F | 41°F | – | – | 9 h 30 min |
| December 27 | 57°F | 41°F | – | – | 9 h 30 min |
| December 28 | 57°F | 41°F | – | – | 9 h 30 min |
| December 29 | 57°F | 41°F | – | – | 9 h 30 min |
| December 30 | 57°F | 41°F | – | – | 9 h 30 min |
| December 31 | 57°F | 41°F | – | – | 9 h 30 min |
- Normal high
- 58°FDecember average
- Normal low
- 42°FDecember average
- Precipitation
- 4.49 inmonth total
- Nights at 32°F or colder
- 1
- Daylight
- 9 h 40 min to 9 h 30 minDecember 1 to December 31
- Sunshine
- 72%of clear-sky sunlight (NASA)
Source: NOAA NCEI 1991-2020 daily normals, station USC00049219; monthly normals. Daylight is computed from the place's latitude with NOAA's solar equations.
Does it rain in Vallejo in December?
In a normal December in Vallejo, 1 nights fall to freezing.
Source: NOAA NCEI 1991-2020 daily and monthly normals, station USC00049219.
What are the records for December in Vallejo?
The December mean against the 1991-2020 normal of 49.8°F: 2021 48.1°F (−1.7), 2022 47.0°F (−2.8), 2024 52.5°F (+2.8), 2025 48.6°F (−1.2). 1 of 4 ran warmer than normal.
| December | Mean | Against normal | Precip. |
|---|---|---|---|
| 2021 | 48.1°F | −1.7°F | 7.79 in |
| 2022 | 47.0°F | −2.8°F | 9.32 in |
| 2024 | 52.5°F | +2.8°F | 4.03 in |
| 2025 | 48.6°F | −1.2°F | 3.18 in |
Source: recent months: ACIS, station USC00049219. Records and recent months use complete months only.
How does December in Vallejo compare across California?
Across the 219 places PlainClimate covers in California, December normal highs run from 38°F in Tahoma to 71°F in Anaheim; Vallejo's is 58°F.
Source: NOAA NCEI 1991-2020 monthly normals for every station in the state.