Napa weather in December: Napa, California: normal highs, lows, rain and records for December
Napa in December has a normal high of 57°F and a normal low of 38°F, a daily mean of 48°F, falling from 60°F on the 1st to 56°F by the 31st. Measurable precipitation falls on 10 days in a normal December, 3.82 inches in all. (NOAA 1991-2020 normals)
In metric: a normal high of 14°C and low of 3°C, 97 mm of precipitation in December.
- NOAA stationNapa County Airport
- Station IDUSW00093227
- Location38.21°N 122.28°W
- Elevation14 ft (4 m)
- Population76,921
- Jan 57° 38°
- Feb 61° 40°
- Mar 64° 42°
- Apr 68° 44°
- May 73° 48°
- Jun 78° 52°
- Jul 79° 55°
- Aug 80° 54°
- Sep 80° 51°
- Oct 75° 46°
- Nov 65° 40°
- Dec 57° 38°
Each month: normal high (large) and low, °F. Fill: the month's normal mean, colder blue to hotter red.
How warm is Napa in December?
The normal high is 57°F and the normal low 38°F, for a daily mean of 47.5°F. December is 5.2°F cooler than November and 0.1°F cooler than January. December is the 12th warmest month of the year in Napa and the 3rd wettest. Across the month the normal high falls 4°F, from 60°F on December 1 to 56°F on December 31. From one year to the next December's mean temperature typically moves about 2.5°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 33%).
| Day | High | Low | Chance of 0.01 in | Chance of 0.10 in |
|---|---|---|---|---|
| December 1 | 60°F | 38°F | 30% | 19% |
| December 8 | 58°F | 38°F | 32% | 21% |
| December 15 | 57°F | 38°F | 33% | 22% |
| December 22 | 56°F | 37°F | 33% | 22% |
| December 31 | 56°F | 38°F | 33% | 21% |
Every day of December: normal high, low and chance of precipitation (warmest afternoon December 1, coldest night December 16)
| Day | High | Low | Chance of 0.01 in | Chance of 0.10 in | Daylight |
|---|---|---|---|---|---|
| December 1 | 60°F | 38°F | 30% | 19% | 9 h 40 min |
| December 2 | 60°F | 38°F | 30% | 19% | 9 h 40 min |
| December 3 | 59°F | 38°F | 30% | 20% | 9 h 40 min |
| December 4 | 59°F | 38°F | 31% | 20% | 9 h 40 min |
| December 5 | 59°F | 38°F | 31% | 20% | 9 h 40 min |
| December 6 | 59°F | 38°F | 31% | 20% | 9 h 40 min |
| December 7 | 58°F | 38°F | 31% | 20% | 9 h 40 min |
| December 8 | 58°F | 38°F | 32% | 21% | 9 h 40 min |
| December 9 | 58°F | 38°F | 32% | 21% | 9 h 40 min |
| December 10 | 58°F | 38°F | 32% | 21% | 9 h 30 min |
| December 11 | 58°F | 38°F | 32% | 21% | 9 h 30 min |
| December 12 | 58°F | 38°F | 32% | 21% | 9 h 30 min |
| December 13 | 57°F | 38°F | 33% | 22% | 9 h 30 min |
| December 14 | 57°F | 38°F | 33% | 22% | 9 h 30 min |
| December 15 | 57°F | 38°F | 33% | 22% | 9 h 30 min |
| December 16 | 57°F | 37°F | 33% | 22% | 9 h 30 min |
| December 17 | 57°F | 37°F | 33% | 22% | 9 h 30 min |
| December 18 | 57°F | 37°F | 33% | 22% | 9 h 30 min |
| December 19 | 57°F | 37°F | 33% | 22% | 9 h 30 min |
| December 20 | 57°F | 37°F | 33% | 22% | 9 h 30 min |
| December 21 | 57°F | 37°F | 33% | 22% | 9 h 30 min |
| December 22 | 56°F | 37°F | 33% | 22% | 9 h 30 min |
| December 23 | 56°F | 37°F | 33% | 21% | 9 h 30 min |
| December 24 | 56°F | 37°F | 33% | 21% | 9 h 30 min |
| December 25 | 56°F | 37°F | 33% | 21% | 9 h 30 min |
| December 26 | 56°F | 37°F | 33% | 21% | 9 h 30 min |
| December 27 | 56°F | 38°F | 33% | 21% | 9 h 30 min |
| December 28 | 56°F | 38°F | 33% | 21% | 9 h 30 min |
| December 29 | 56°F | 38°F | 33% | 21% | 9 h 30 min |
| December 30 | 56°F | 38°F | 33% | 21% | 9 h 30 min |
| December 31 | 56°F | 38°F | 33% | 21% | 9 h 30 min |
- Normal high
- 57°FDecember average
- Normal low
- 38°FDecember average
- Precipitation
- 3.82 inmonth total
- Days with precipitation
- 100.01 inch or more
- Nights at 32°F or colder
- 11
- 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 USW00093227; monthly normals. Daylight is computed from the place's latitude with NOAA's solar equations.
Does it rain in Napa in December?
On a given December day the chance of 0.01 inch or more is 32% on average, highest around December 17 (33%). In all, 3.82 in falls on 10 days of a normal December, 1 of them with an inch or more.
In a normal December in Napa, 11 nights fall to freezing.
Source: NOAA NCEI 1991-2020 daily and monthly normals, station USW00093227.
What are the records for December in Napa?
The warmest December temperature on this station's record (since 1998) is 78°F, on December 19, 1999; the coldest is 16°F, on December 5, 2013. The wettest December brought 11.27 in (2005).
The December mean against the 1991-2020 normal of 47.5°F: 2021 46.5°F (−1.0), 2022 46.9°F (−0.6), 2023 51.5°F (+4.0), 2024 50.0°F (+2.5), 2025 48.4°F (+0.9). 3 of 5 ran warmer than normal.
| December | Mean | Against normal | Precip. |
|---|---|---|---|
| 2021 | 46.5°F | −1.0°F | 7.21 in |
| 2022 | 46.9°F | −0.6°F | 7.48 in |
| 2023 | 51.5°F | +4.0°F | 4.33 in |
| 2024 | 50.0°F | +2.5°F | 5.93 in |
| 2025 | 48.4°F | +0.9°F | 3.97 in |
Source: records: ACIS, station USW00093227; recent months: ACIS, station USW00093227. Records and recent months use complete months only.
How does December in Napa 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; Napa's is 57°F.
Source: NOAA NCEI 1991-2020 monthly normals for every station in the state.