Riverside Weather in December
Average highs run from 42°F on December 1 to 35°F on December 31, and lows from 24°F to 19°F. Normal precipitation for the month is 1.60 in over about 9 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
- 37°F
- Average low
- 21°F
- Precipitation
- 1.60 in
- Snowfall
- 10.9 in
- Record high
- 61°FDec 3, 1998
- Record low
- -19°FDec 26, 2001
- Chance of a freeze
- 100%
- Daylight
- 9 h 22 min to 9 h 12 min
- Cloud cover
- 66%
- Humidity
- 84%
- Dew point
- 17°F
- Wind
- 6.3 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 | 42°F | 24°F | 56°F 1998 | -1°F 2019 | 27% | 15% |
| Dec 2 | 41°F | 24°F | 55°F 2012 | -4°F 2022 | 27% | 15% |
| Dec 3 | 41°F | 23°F | 61°F 1998 | -5°F 2022 | 28% | 15% |
| Dec 4 | 41°F | 23°F | 52°F 2007 | -1°F 2018 | 28% | 16% |
| Dec 5 | 40°F | 23°F | 53°F 2014 | -1°F 2009 | 28% | 16% |
| Dec 6 | 40°F | 23°F | 55°F 2014 | 0°F 2005 | 28% | 16% |
| Dec 7 | 40°F | 22°F | 56°F 2014 | -9°F 2005 | 28% | 17% |
| Dec 8 | 39°F | 22°F | 51°F 2015 | -8°F 2005 | 28% | 17% |
| Dec 9 | 39°F | 22°F | 54°F 2025 | -16°F 2013 | 28% | 17% |
| Dec 10 | 39°F | 22°F | 58°F 2025 | -14°F 2009 | 28% | 17% |
| Dec 11 | 38°F | 22°F | 58°F 2025 | -14°F 2009 | 28% | 18% |
| Dec 12 | 38°F | 21°F | 60°F 2014 | -4°F 2013 | 28% | 18% |
| Dec 13 | 38°F | 21°F | 53°F 2004 | 0°F 2013 | 28% | 18% |
| Dec 14 | 37°F | 21°F | 53°F 2021 | 1°F 2018 | 28% | 19% |
| Dec 15 | 37°F | 21°F | 53°F 2006 | -4°F 2001 | 28% | 19% |
| Dec 16 | 37°F | 21°F | 51°F 2025 | -3°F 2001 | 28% | 19% |
| Dec 17 | 37°F | 21°F | 58°F 2025 | -4°F 2019 | 28% | 19% |
| Dec 18 | 36°F | 20°F | 46°F 2018 | -5°F 2008 | 28% | 20% |
| Dec 19 | 36°F | 20°F | 52°F 2025 | -11°F 2022 | 28% | 20% |
| Dec 20 | 36°F | 20°F | 52°F 2017 | -14°F 1998 | 29% | 20% |
| Dec 21 | 36°F | 20°F | 61°F 2025 | -13°F 1998 | 29% | 21% |
| Dec 22 | 36°F | 20°F | 60°F 2025 | -12°F 1998 | 29% | 21% |
| Dec 23 | 36°F | 20°F | 58°F 2025 | -15°F 1998 | 29% | 21% |
| Dec 24 | 35°F | 20°F | 60°F 2025 | -14°F 2001 | 29% | 21% |
| Dec 25 | 35°F | 20°F | 56°F 2025 | -14°F 2001 | 30% | 21% |
| Dec 26 | 35°F | 20°F | 51°F 2025 | -19°F 2001 | 30% | 22% |
| Dec 27 | 35°F | 20°F | 47°F 2022 | -9°F 2016 | 30% | 22% |
| Dec 28 | 35°F | 20°F | 47°F 2004 | -5°F 2009 | 30% | 22% |
| Dec 29 | 35°F | 20°F | 50°F 2011 | -7°F 2020 | 31% | 22% |
| Dec 30 | 35°F | 20°F | 57°F 2011 | -7°F 2020 | 31% | 22% |
| Dec 31 | 35°F | 19°F | 46°F 2005 | -9°F 2015 | 31% | 22% |
Chance of rain
- Chance of a wet day
- Chance of snowfall
Sunrise and sunset
Times for 2026, local time (MST).
- December 1
- sunrise 7:37 AM, sunset 4:59 PM
- December 31
- sunrise 7:56 AM, sunset 5:08 PM
Other months
Sources
Normals: NOAA NCEI U.S. Climate Normals, 1991-2020, station USC00428817 (Tremonton), public domain. Records: NOAA GHCN-Daily, station USW00094128, 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.