Riverside Weather in December
Average highs run from 47°F on December 1 to 39°F on December 31, and lows from 31°F to 24°F. Normal precipitation for the month is 4.44 in over about 11 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
- 43°F
- Average low
- 27°F
- Precipitation
- 4.44 in
- Snowfall
- 5.8 in
- Record high
- 75°FDec 7, 1998
- Record low
- -5°FDec 25, 1980
- Chance of a freeze
- 100%
- Daylight
- 9 h 27 min to 9 h 17 min
- Cloud cover
- 64%
- Humidity
- 86%
- Dew point
- 30°F
- Wind
- 8.1 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 | 47°F | 31°F | 68°F 2001 | 10°F 1976 | 36% | 5% |
| Dec 2 | 47°F | 31°F | 65°F 1962 | 11°F 1967 | 37% | 5% |
| Dec 3 | 47°F | 30°F | 66°F 1998 | 7°F 1976 | 37% | 6% |
| Dec 4 | 46°F | 30°F | 72°F 1998 | 10°F 1966 | 37% | 6% |
| Dec 5 | 46°F | 30°F | 68°F 2001 | 14°F 1966 | 37% | 6% |
| Dec 6 | 46°F | 29°F | 70°F 2001 | 16°F 1954 | 37% | 6% |
| Dec 7 | 45°F | 29°F | 75°F 1998 | 14°F 1954 | 37% | 7% |
| Dec 8 | 45°F | 29°F | 61°F 1980 | 12°F 1976 | 37% | 7% |
| Dec 9 | 45°F | 29°F | 63°F 1966 | 10°F 1976 | 37% | 7% |
| Dec 10 | 44°F | 29°F | 61°F 1966 | 6°F 1968 | 37% | 7% |
| Dec 11 | 44°F | 28°F | 64°F 2021 | 3°F 1958 | 37% | 7% |
| Dec 12 | 44°F | 28°F | 65°F 2015 | 2°F 1988 | 37% | 8% |
| Dec 13 | 43°F | 28°F | 65°F 2015 | 7°F 1960 | 37% | 8% |
| Dec 14 | 43°F | 28°F | 61°F 2015 | 6°F 1976 | 37% | 8% |
| Dec 15 | 43°F | 27°F | 62°F 2015 | 9°F 1960 | 37% | 8% |
| Dec 16 | 42°F | 27°F | 60°F 2021 | 9°F 1961 | 37% | 9% |
| Dec 17 | 42°F | 27°F | 62°F 1971 | 11°F 1980 | 37% | 9% |
| Dec 18 | 42°F | 27°F | 63°F 2023 | 11°F 1980 | 37% | 9% |
| Dec 19 | 42°F | 27°F | 57°F 2025 | 10°F 1989 | 37% | 9% |
| Dec 20 | 41°F | 26°F | 59°F 1957 | 4°F 1955 | 37% | 10% |
| Dec 21 | 41°F | 26°F | 62°F 2018 | -3°F 1955 | 37% | 10% |
| Dec 22 | 41°F | 26°F | 68°F 2013 | 5°F 1958 | 37% | 10% |
| Dec 23 | 41°F | 26°F | 66°F 2019 | 3°F 1989 | 37% | 10% |
| Dec 24 | 41°F | 26°F | 69°F 2015 | 2°F 1975 | 37% | 11% |
| Dec 25 | 40°F | 25°F | 64°F 2015 | -5°F 1980 | 37% | 11% |
| Dec 26 | 40°F | 25°F | 61°F 1982 | -2°F 1980 | 37% | 11% |
| Dec 27 | 40°F | 25°F | 60°F 1973 | 5°F 1989 | 37% | 11% |
| Dec 28 | 40°F | 25°F | 63°F 2008 | 3°F 1960 | 37% | 12% |
| Dec 29 | 40°F | 25°F | 68°F 1984 | 7°F 1993 | 37% | 12% |
| Dec 30 | 39°F | 25°F | 66°F 1984 | 5°F 1987 | 37% | 12% |
| Dec 31 | 39°F | 24°F | 57°F 1992 | -3°F 1962 | 37% | 12% |
Chance of rain
- Chance of a wet day
- Chance of snowfall
Sunrise and sunset
Times for 2026, local time (EST).
- December 1
- sunrise 7:00 AM, sunset 4:27 PM
- December 31
- sunrise 7:19 AM, sunset 4:36 PM
Other months
Sources
Normals: NOAA NCEI U.S. Climate Normals, 1991-2020, station USC00067970 (Stamford 5 N), public domain. Records: NOAA GHCN-Daily, station USW00094745, 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.