Westminster Weather in December
Average highs run from 70°F on December 1 to 69°F on December 31, and lows from 49°F to 48°F. Normal precipitation for the month is 2.16 in over about 6 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
- 68°F
- Average low
- 48°F
- Precipitation
- 2.16 in
- Record high
- 92°FDec 3, 1958
- Record low
- 28°FDec 22, 1990
- Chance of a freeze
- 2%
- Daylight
- 10 h 04 min to 9 h 57 min
- Cloud cover
- 43%
- Humidity
- 58%
- Dew point
- 35°F
- Wind
- 7.8 mph
Every day of the month
A wet day has at least 0.01 inch of precipitation.
| Date | Normal high | Normal low | Record high | Record low | Chance wet |
|---|---|---|---|---|---|
| Dec 1 | 70°F | 49°F | 87°F 1959 | 37°F 1991 | 15% |
| Dec 2 | 70°F | 49°F | 88°F 1958 | 40°F 1953 | 15% |
| Dec 3 | 69°F | 49°F | 92°F 1958 | 37°F 1973 | 15% |
| Dec 4 | 69°F | 49°F | 89°F 1979 | 38°F 1973 | 16% |
| Dec 5 | 69°F | 49°F | 89°F 1979 | 37°F 1972 | 16% |
| Dec 6 | 69°F | 49°F | 86°F 1990 | 36°F 1968 | 16% |
| Dec 7 | 69°F | 48°F | 83°F 1990 | 31°F 1960 | 17% |
| Dec 8 | 69°F | 48°F | 85°F 1975 | 31°F 1978 | 17% |
| Dec 9 | 68°F | 48°F | 87°F 2017 | 33°F 1960 | 17% |
| Dec 10 | 68°F | 48°F | 86°F 1950 | 36°F 1972 | 17% |
| Dec 11 | 68°F | 48°F | 85°F 2017 | 34°F 1949 | 18% |
| Dec 12 | 68°F | 48°F | 87°F 2010 | 32°F 1949 | 18% |
| Dec 13 | 68°F | 48°F | 83°F 1953 | 35°F 1949 | 18% |
| Dec 14 | 68°F | 48°F | 83°F 1953 | 33°F 1967 | 19% |
| Dec 15 | 68°F | 48°F | 84°F 1980 | 36°F 1972 | 19% |
| Dec 16 | 68°F | 48°F | 89°F 1980 | 38°F 1971 | 19% |
| Dec 17 | 68°F | 48°F | 85°F 1950 | 38°F 1984 | 19% |
| Dec 18 | 68°F | 48°F | 85°F 1985 | 37°F 1960 | 20% |
| Dec 19 | 68°F | 48°F | 85°F 1985 | 36°F 2006 | 20% |
| Dec 20 | 68°F | 48°F | 83°F 1960 | 35°F 1978 | 20% |
| Dec 21 | 68°F | 48°F | 83°F 2020 | 31°F 1968 | 20% |
| Dec 22 | 68°F | 48°F | 84°F 1960 | 28°F 1990 | 20% |
| Dec 23 | 68°F | 48°F | 85°F 1989 | 30°F 1990 | 21% |
| Dec 24 | 68°F | 48°F | 85°F 1985 | 32°F 1974 | 21% |
| Dec 25 | 68°F | 48°F | 84°F 1956 | 31°F 1974 | 21% |
| Dec 26 | 68°F | 48°F | 83°F 1956 | 32°F 1987 | 21% |
| Dec 27 | 68°F | 48°F | 85°F 1956 | 34°F 1966 | 21% |
| Dec 28 | 68°F | 48°F | 85°F 1956 | 32°F 1962 | 21% |
| Dec 29 | 68°F | 48°F | 87°F 1980 | 34°F 1954 | 21% |
| Dec 30 | 69°F | 48°F | 89°F 1980 | 36°F 1955 | 21% |
| Dec 31 | 69°F | 48°F | 82°F 1963 | 35°F 1982 | 21% |
Chance of rain
- Chance of a wet day
Sunrise and sunset
Times for 2026, local time (PST).
- December 1
- sunrise 6:39 AM, sunset 4:43 PM
- December 31
- sunrise 6:57 AM, sunset 4:54 PM
Other months
Sources
Normals: NOAA NCEI U.S. Climate Normals, 1991-2020, station USC00047888 (Santa Ana Fire Stn), public domain. Records: NOAA GHCN-Daily, station USW00023129, 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 2026-09-24. Sun and moon: computed with the NOAA solar equations and Meeus.