Vacaville weather in December: Vacaville, California: normal highs, lows, rain and records for December
Vacaville in December has a normal high of 58°F and a normal low of 37°F, a daily mean of 48°F, falling from 61°F on the 1st to 57°F by the 31st. Measurable precipitation falls on 10 days in a normal December, 5.08 inches in all. (NOAA 1991-2020 normals)
In metric: a normal high of 14°C and low of 3°C, 129 mm of precipitation in December.
- NOAA stationVacaville Nut Tree Airport
- Station IDUSW00093241
- Location38.38°N 121.96°W
- Elevation109 ft (33 m)
- Population103,994
- Jan 58° 38°
- Feb 63° 40°
- Mar 68° 43°
- Apr 73° 46°
- May 81° 51°
- Jun 90° 56°
- Jul 95° 59°
- Aug 94° 58°
- Sep 91° 56°
- Oct 80° 49°
- Nov 67° 42°
- Dec 58° 37°
Each month: normal high (large) and low, °F. Fill: the month's normal mean, colder blue to hotter red.
How warm is Vacaville in December?
The normal high is 58°F and the normal low 37°F, for a daily mean of 47.5°F. December is 6.5°F cooler than November and 0.2°F cooler than January. December is the 12th warmest month of the year in Vacaville and the 2nd wettest. Across the month the normal high falls 4°F, from 61°F on December 1 to 57°F on December 31. From one year to the next December's mean temperature typically moves about 2.4°F either way (NOAA's standard deviation), so roughly two Decembers in three average between 45°F and 50°F.
Bars above: each day's normal high to low. Columns below: the chance of 0.01 inch or more of precipitation that day, on a scale of 0 to 100% (highest 34%).
| Day | High | Low | Chance of 0.01 in | Chance of 0.10 in |
|---|---|---|---|---|
| December 1 | 61°F | 38°F | 31% | 21% |
| December 8 | 59°F | 38°F | 32% | 22% |
| December 15 | 58°F | 37°F | 33% | 23% |
| December 22 | 57°F | 37°F | 33% | 23% |
| December 31 | 57°F | 37°F | 34% | 22% |
Every day of December: normal high, low and chance of precipitation (warmest afternoon December 1, coldest night December 23)
| Day | High | Low | Chance of 0.01 in | Chance of 0.10 in | Daylight |
|---|---|---|---|---|---|
| December 1 | 61°F | 38°F | 31% | 21% | 9 h 40 min |
| December 2 | 60°F | 38°F | 31% | 21% | 9 h 40 min |
| December 3 | 60°F | 38°F | 31% | 21% | 9 h 40 min |
| December 4 | 60°F | 38°F | 31% | 21% | 9 h 40 min |
| December 5 | 59°F | 38°F | 32% | 22% | 9 h 40 min |
| December 6 | 59°F | 38°F | 32% | 22% | 9 h 40 min |
| December 7 | 59°F | 38°F | 32% | 22% | 9 h 40 min |
| December 8 | 59°F | 38°F | 32% | 22% | 9 h 40 min |
| December 9 | 59°F | 37°F | 32% | 22% | 9 h 30 min |
| December 10 | 58°F | 37°F | 32% | 22% | 9 h 30 min |
| December 11 | 58°F | 37°F | 32% | 23% | 9 h 30 min |
| December 12 | 58°F | 37°F | 33% | 23% | 9 h 30 min |
| December 13 | 58°F | 37°F | 33% | 23% | 9 h 30 min |
| December 14 | 58°F | 37°F | 33% | 23% | 9 h 30 min |
| December 15 | 58°F | 37°F | 33% | 23% | 9 h 30 min |
| December 16 | 57°F | 37°F | 33% | 23% | 9 h 30 min |
| December 17 | 57°F | 37°F | 33% | 23% | 9 h 30 min |
| December 18 | 57°F | 37°F | 33% | 23% | 9 h 30 min |
| December 19 | 57°F | 37°F | 33% | 23% | 9 h 30 min |
| December 20 | 57°F | 37°F | 33% | 23% | 9 h 30 min |
| December 21 | 57°F | 37°F | 33% | 23% | 9 h 30 min |
| December 22 | 57°F | 37°F | 33% | 23% | 9 h 30 min |
| December 23 | 57°F | 37°F | 33% | 22% | 9 h 30 min |
| December 24 | 57°F | 37°F | 33% | 22% | 9 h 30 min |
| December 25 | 57°F | 37°F | 33% | 22% | 9 h 30 min |
| December 26 | 57°F | 37°F | 33% | 22% | 9 h 30 min |
| December 27 | 57°F | 37°F | 33% | 22% | 9 h 30 min |
| December 28 | 57°F | 37°F | 33% | 22% | 9 h 30 min |
| December 29 | 57°F | 37°F | 34% | 22% | 9 h 30 min |
| December 30 | 57°F | 37°F | 34% | 22% | 9 h 30 min |
| December 31 | 57°F | 37°F | 34% | 22% | 9 h 30 min |
- Normal high
- 58°FDecember average
- Normal low
- 37°FDecember average
- Precipitation
- 5.08 inmonth total
- Days with precipitation
- 100.01 inch or more
- Nights at 32°F or colder
- 8
- Daylight
- 9 h 40 min to 9 h 30 minDecember 1 to December 31
- Days at 70°F or more
- 1
- Sunshine
- 71%of clear-sky sunlight (NASA)
Source: NOAA NCEI 1991-2020 daily normals, station USW00093241; monthly normals. Daylight is computed from the place's latitude with NOAA's solar equations.
Does it rain in Vacaville in December?
On a given December day the chance of 0.01 inch or more is 33% on average, highest around December 30 (34%). In all, 5.08 in falls on 10 days of a normal December, 1 of them with an inch or more.
In a normal December in Vacaville, 8 nights fall to freezing.
Source: NOAA NCEI 1991-2020 daily and monthly normals, station USW00093241.
What are the records for December in Vacaville?
The warmest December temperature on this station's record (since 1998) is 76°F, on December 20, 1999; the coldest is 17°F, on December 23, 1998. The wettest December brought 15.29 in (2005).
The December mean against the 1991-2020 normal of 47.5°F: 2021 46.1°F (−1.4), 2022 45.8°F (−1.7), 2023 50.8°F (+3.3), 2024 50.2°F (+2.7), 2025 47.6°F (+0.1). 3 of 5 ran warmer than normal.
| December | Mean | Against normal | Precip. |
|---|---|---|---|
| 2021 | 46.1°F | −1.4°F | – |
| 2022 | 45.8°F | −1.7°F | 7.99 in |
| 2023 | 50.8°F | +3.3°F | 4.46 in |
| 2024 | 50.2°F | +2.7°F | 5.08 in |
| 2025 | 47.6°F | +0.1°F | 4.66 in |
Source: records: ACIS, station USW00093241; recent months: ACIS, station USW00093241. Records and recent months use complete months only.
How does December in Vacaville 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; Vacaville's is 58°F.
Source: NOAA NCEI 1991-2020 monthly normals for every station in the state.
Other months and places
- Vacaville in November67°F by day, 42°F at night
- Vacaville in January58°F by day, 38°F at night
- Vacaville through the yearEvery month, frost dates, records and recent years
- California in DecemberThe statewide normal and the warmest and coolest places
- Anaheim: California's warmest Decembernormal high 71°F