Riverside climate

Riverside Weather in December

NOAA 1991-2020 normals for Riverside Fire Stn 3, 0.8 km from Riverside

Average highs run from 71°F on December 1 to 69°F on December 31, and lows from 43°F to 42°F. Normal precipitation for the month is 1.40 in over about 4 wet days.

December day by day

The normal high and low for each date, and the record, in °F.

Normal daily high and low temperature at Riverside, in °F, with the record for each date.20406080100151015202530
  • Normal low
  • Normal high
  • Record high
  • Record low

December at a glance

Average high
69°F
Average low
42°F
Precipitation
1.40 in
Record high
89°FDec 1, 2021
Record low
25°FDec 24, 1998
Chance of a freeze
40%
Daylight
10 h 03 min to 9 h 56 min
Cloud cover
43%
Humidity
54%
Dew point
30°F
Wind
6.9 mph

Every day of the month

A wet day has at least 0.01 inch of precipitation.

DateNormal highNormal lowRecord highRecord lowChance wet
Dec 171°F43°F89°F 202129°F 200410%
Dec 271°F43°F80°F 201730°F 200411%
Dec 371°F43°F77°F 200035°F 200311%
Dec 471°F43°F82°F 202329°F 200411%
Dec 570°F43°F83°F 202332°F 200611%
Dec 670°F42°F83°F 202431°F 200611%
Dec 770°F42°F83°F 200634°F 199912%
Dec 870°F42°F84°F 201531°F 199812%
Dec 969°F42°F83°F 202530°F 200112%
Dec 1069°F42°F88°F 202533°F 200112%
Dec 1169°F42°F85°F 200434°F 199812%
Dec 1269°F42°F86°F 201031°F 200313%
Dec 1369°F42°F82°F 201032°F 200113%
Dec 1469°F42°F80°F 200433°F 200313%
Dec 1569°F42°F81°F 201731°F 200113%
Dec 1669°F42°F84°F 201332°F 200114%
Dec 1769°F42°F87°F 201331°F 200114%
Dec 1868°F42°F83°F 202430°F 200114%
Dec 1968°F42°F86°F 202430°F 200614%
Dec 2068°F42°F84°F 202027°F 200614%
Dec 2168°F42°F84°F 200530°F 200615%
Dec 2268°F42°F76°F 200526°F 199815%
Dec 2368°F42°F80°F 200534°F 199815%
Dec 2468°F42°F86°F 200525°F 199815%
Dec 2568°F42°F84°F 202228°F 199815%
Dec 2669°F42°F80°F 202231°F 200116%
Dec 2769°F42°F82°F 201330°F 200316%
Dec 2869°F42°F85°F 201728°F 200316%
Dec 2969°F42°F84°F 201731°F 200316%
Dec 3069°F42°F79°F 199833°F 200616%
Dec 3169°F42°F83°F 201131°F 201016%

Chance of rain

The chance of at least 0.01 inch of precipitation on each date at Riverside, in percent.051015201102030
  • Chance of a wet day

Sunrise and sunset

Times for 2026, local time (PST).

December 1
sunrise 6:37 AM, sunset 4:40 PM
December 31
sunrise 6:55 AM, sunset 4:51 PM

Every day of December: sun and moon

Other months

Sources

Normals: NOAA NCEI U.S. Climate Normals, 1991-2020, station USC00047470 (Riverside Fire Stn 3), public domain. Records: NOAA GHCN-Daily, station USW00003171, 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.