Santa Rosa Weather in December
Average highs run from 58°F on December 1 to 54°F on December 31, and lows from 27°F to 24°F. Normal precipitation for the month is 0.75 in over about 3 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
- 55°F
- Average low
- 25°F
- Precipitation
- 0.75 in
- Snowfall
- 3.2 in
- Record high
- 81°FDec 4, 2007
- Record low
- -17°FDec 23, 1990
- Chance of a freeze
- 100%
- Daylight
- 9 h 59 min to 9 h 51 min
- Cloud cover
- 47%
- Humidity
- 55%
- Dew point
- 20°F
- Wind
- 11.0 mph
Every day of the month
A wet day has at least 0.01 inch of precipitation; snow means at least 0.1 inch of snowfall.
| Date | Normal high | Normal low | Record high | Record low | Chance wet | Chance of snow |
|---|---|---|---|---|---|---|
| Dec 1 | 58°F | 27°F | 74°F 1995 | 14°F 1979 | 10% | 4% |
| Dec 2 | 57°F | 27°F | 76°F 1926 | 11°F 1991 | 10% | 4% |
| Dec 3 | 57°F | 26°F | 75°F 1977 | 5°F 1971 | 10% | 4% |
| Dec 4 | 57°F | 26°F | 81°F 2007 | 12°F 1990 | 10% | 4% |
| Dec 5 | 56°F | 26°F | 74°F 1958 | 12°F 1997 | 10% | 4% |
| Dec 6 | 56°F | 26°F | 76°F 1981 | 6°F 1972 | 10% | 5% |
| Dec 7 | 56°F | 26°F | 75°F 1981 | 10°F 1927 | 10% | 5% |
| Dec 8 | 56°F | 26°F | 74°F 1970 | -13°F 1978 | 10% | 5% |
| Dec 9 | 55°F | 26°F | 76°F 1950 | -11°F 1978 | 10% | 5% |
| Dec 10 | 55°F | 25°F | 76°F 1939 | -1°F 1978 | 10% | 5% |
| Dec 11 | 55°F | 25°F | 78°F 1939 | 7°F 1924 | 10% | 5% |
| Dec 12 | 55°F | 25°F | 75°F 1939 | 7°F 1989 | 10% | 5% |
| Dec 13 | 55°F | 25°F | 76°F 1969 | 1°F 1961 | 10% | 5% |
| Dec 14 | 54°F | 25°F | 75°F 1977 | 9°F 1931 | 10% | 5% |
| Dec 15 | 54°F | 25°F | 73°F 1979 | 8°F 1949 | 10% | 5% |
| Dec 16 | 54°F | 25°F | 73°F 1962 | 6°F 1987 | 10% | 5% |
| Dec 17 | 54°F | 25°F | 79°F 1980 | 0°F 1932 | 10% | 6% |
| Dec 18 | 54°F | 25°F | 73°F 1980 | 0°F 1932 | 10% | 6% |
| Dec 19 | 54°F | 25°F | 69°F 1954 | 3°F 1924 | 10% | 6% |
| Dec 20 | 54°F | 25°F | 72°F 2003 | 3°F 1924 | 10% | 6% |
| Dec 21 | 54°F | 25°F | 74°F 1955 | 1°F 1990 | 10% | 6% |
| Dec 22 | 54°F | 25°F | 74°F 1933 | -4°F 1990 | 10% | 6% |
| Dec 23 | 54°F | 25°F | 73°F 1955 | -17°F 1990 | 10% | 6% |
| Dec 24 | 54°F | 25°F | 72°F 1964 | 0°F 1923 | 10% | 6% |
| Dec 25 | 54°F | 25°F | 73°F 1955 | -7°F 1924 | 10% | 6% |
| Dec 26 | 54°F | 24°F | 72°F 1928 | -7°F 1997 | 10% | 6% |
| Dec 27 | 54°F | 24°F | 77°F 1980 | 0°F 1918 | 10% | 6% |
| Dec 28 | 54°F | 24°F | 72°F 1980 | -6°F 1918 | 10% | 6% |
| Dec 29 | 54°F | 24°F | 73°F 1985 | -6°F 1983 | 9% | 5% |
| Dec 30 | 54°F | 24°F | 73°F 1980 | 0°F 1918 | 9% | 5% |
| Dec 31 | 54°F | 24°F | 71°F 2008 | -5°F 1958 | 9% | 5% |
Chance of rain
- Chance of a wet day
- Chance of snowfall
Sunrise and sunset
Times for 2026, local time (MST).
- December 1
- sunrise 6:48 AM, sunset 4:47 PM
- December 31
- sunrise 7:06 AM, sunset 4:57 PM
Other months
Sources
Normals: NOAA NCEI U.S. Climate Normals, 1991-2020, station USC00298107 (Santa Rosa), public domain. Records: NOAA GHCN-Daily, station USC00298107, 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 2026-09-25. Sun and moon: computed with the NOAA solar equations and Meeus.