Santa Rosa weather in December: Santa Rosa, California: normal highs, lows, rain and records for December
Santa Rosa in December has a normal high of 58°F and a normal low of 37°F, a daily mean of 47°F, falling from 60°F on the 1st to 57°F by the 31st. Measurable precipitation falls on 13 days in a normal December, 6.76 inches in all. (NOAA 1991-2020 normals)
In metric: a normal high of 14°C and low of 3°C, 172 mm of precipitation in December.
- NOAA stationSanta Rosa Sonoma County Airport
- Station IDUSW00023213
- Location38.50°N 122.81°W
- Elevation114 ft (35 m)
- Population177,524
- Jan 58° 38°
- Feb 62° 39°
- Mar 65° 41°
- Apr 69° 43°
- May 75° 47°
- Jun 82° 50°
- Jul 84° 52°
- Aug 84° 52°
- Sep 83° 50°
- Oct 77° 46°
- Nov 65° 40°
- 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 Santa Rosa in December?
The normal high is 58°F and the normal low 37°F, for a daily mean of 47.2°F. December is 5.6°F cooler than November and 0.5°F cooler than January. December is the 12th warmest month of the year in Santa Rosa and the wettest. Across the month the normal high falls 3°F, from 60°F on December 1 to 57°F on December 31. From one year to the next December's mean temperature typically moves about 2.3°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 41%).
| Day | High | Low | Chance of 0.01 in | Chance of 0.10 in |
|---|---|---|---|---|
| December 1 | 60°F | 38°F | 37% | 25% |
| December 8 | 58°F | 37°F | 39% | 27% |
| December 15 | 57°F | 37°F | 41% | 28% |
| December 22 | 57°F | 37°F | 41% | 29% |
| December 31 | 57°F | 37°F | 41% | 28% |
Every day of December: normal high, low and chance of precipitation (warmest afternoon December 1, coldest night December 19)
| Day | High | Low | Chance of 0.01 in | Chance of 0.10 in | Daylight |
|---|---|---|---|---|---|
| December 1 | 60°F | 38°F | 37% | 25% | 9 h 40 min |
| December 2 | 59°F | 38°F | 38% | 25% | 9 h 40 min |
| December 3 | 59°F | 38°F | 38% | 25% | 9 h 40 min |
| December 4 | 59°F | 38°F | 38% | 26% | 9 h 40 min |
| December 5 | 59°F | 37°F | 39% | 26% | 9 h 40 min |
| December 6 | 58°F | 37°F | 39% | 26% | 9 h 40 min |
| December 7 | 58°F | 37°F | 39% | 26% | 9 h 40 min |
| December 8 | 58°F | 37°F | 39% | 27% | 9 h 30 min |
| December 9 | 58°F | 37°F | 40% | 27% | 9 h 30 min |
| December 10 | 58°F | 37°F | 40% | 27% | 9 h 30 min |
| December 11 | 58°F | 37°F | 40% | 27% | 9 h 30 min |
| December 12 | 58°F | 37°F | 40% | 28% | 9 h 30 min |
| December 13 | 57°F | 37°F | 41% | 28% | 9 h 30 min |
| December 14 | 57°F | 37°F | 41% | 28% | 9 h 30 min |
| December 15 | 57°F | 37°F | 41% | 28% | 9 h 30 min |
| December 16 | 57°F | 37°F | 41% | 28% | 9 h 30 min |
| December 17 | 57°F | 37°F | 41% | 29% | 9 h 30 min |
| December 18 | 57°F | 37°F | 41% | 29% | 9 h 30 min |
| December 19 | 57°F | 37°F | 41% | 29% | 9 h 30 min |
| December 20 | 57°F | 37°F | 41% | 29% | 9 h 30 min |
| December 21 | 57°F | 37°F | 41% | 29% | 9 h 30 min |
| December 22 | 57°F | 37°F | 41% | 29% | 9 h 30 min |
| December 23 | 57°F | 37°F | 41% | 29% | 9 h 30 min |
| December 24 | 57°F | 37°F | 41% | 28% | 9 h 30 min |
| December 25 | 57°F | 37°F | 41% | 28% | 9 h 30 min |
| December 26 | 57°F | 37°F | 41% | 28% | 9 h 30 min |
| December 27 | 57°F | 37°F | 41% | 28% | 9 h 30 min |
| December 28 | 57°F | 37°F | 41% | 28% | 9 h 30 min |
| December 29 | 57°F | 37°F | 41% | 28% | 9 h 30 min |
| December 30 | 57°F | 37°F | 41% | 28% | 9 h 30 min |
| December 31 | 57°F | 37°F | 41% | 28% | 9 h 30 min |
- Normal high
- 58°FDecember average
- Normal low
- 37°FDecember average
- Precipitation
- 6.76 inmonth total
- Days with precipitation
- 130.01 inch or more
- Nights at 32°F or colder
- 11
- Daylight
- 9 h 40 min to 9 h 30 minDecember 1 to December 31
- Days at 70°F or more
- 1
- Sunshine
- 72%of clear-sky sunlight (NASA)
Source: NOAA NCEI 1991-2020 daily normals, station USW00023213; monthly normals. Daylight is computed from the place's latitude with NOAA's solar equations.
Does it rain in Santa Rosa in December?
On a given December day the chance of 0.01 inch or more is 40% on average, highest around December 17 (41%). In all, 6.76 in falls on 13 days of a normal December, 2 of them with an inch or more.
In a normal December in Santa Rosa, 11 nights fall to freezing.
Source: NOAA NCEI 1991-2020 daily and monthly normals, station USW00023213.
What are the records for December in Santa Rosa?
The warmest December temperature on this station's record (since 1998) is 78°F, on December 19, 1999; the coldest is 19°F, on December 9, 2013. The wettest December brought 17.95 in (2005).
The December mean against the 1991-2020 normal of 47.2°F: 2021 46.5°F (−0.7), 2022 46.3°F (−0.9), 2023 51.2°F (+4.0), 2024 50.6°F (+3.4), 2025 48.4°F (+1.2). 3 of 5 ran warmer than normal.
| December | Mean | Against normal | Precip. |
|---|---|---|---|
| 2021 | 46.5°F | −0.7°F | 7.75 in |
| 2022 | 46.3°F | −0.9°F | 9.71 in |
| 2023 | 51.2°F | +4.0°F | 8.74 in |
| 2024 | 50.6°F | +3.4°F | 9.68 in |
| 2025 | 48.4°F | +1.2°F | 6.05 in |
Source: records: ACIS, station USW00023213; recent months: ACIS, station USW00023213. Records and recent months use complete months only.
How does December in Santa Rosa 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; Santa Rosa's is 58°F.
Source: NOAA NCEI 1991-2020 monthly normals for every station in the state.
Other months and places
- Santa Rosa in November65°F by day, 40°F at night
- Santa Rosa in January58°F by day, 38°F at night
- Santa Rosa 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