Weather on December 15
Riverside, CA
55 Years of Data
Avg High
68°F
Avg Low
40°F
Warmest
1980
65°F avg
Coldest
1987
42°F avg
About This Date
December 15th in Riverside, CA typically brings mild winter weather, with average highs around 68°F and lows near 40°F — a 28°F daily swing. Over 55 years of records, the warmest December 15th was in 1980 (65°F average), while the coldest was 1987 (42°F) — a 23°F range across recorded history. Rain or other precipitation has occurred on about 15% of December 15th dates historically, with the wettest December 15th recording 3.68" of rain. The last decade has been 1.8°F warmer on this date compared to 20-30 years ago.
The last decade has been 1.8°F warmer on this date compared to 20-30 years ago.
Planning for December 15th in Riverside, CA? Great weather for outdoor activities.
Warming Trend
0.5°F per decade on this date
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 78° | 45° | 61° | — | — |
| 2024 | 67° | 45° | 56° | — | — |
| 2023 | 77° | 47° | 62° | — | — |
| 2022 | 63° | 37° | 50° | — | — |
| 2021 | 56° | 34° | 45° | — | — |
| 2020 | 68° | 42° | 55° | — | — |
| 2019 | 61° | 44° | 52° | — | — |
| 2018 | 76° | 44° | 60° | — | — |
| 2017 | 81° | 49° | 65° | — | — |
| 2016 | 68° | 51° | 60° | 0.76" | — |
| 2015 | 60° | 36° | 48° | — | — |
| 2014 | 63° | 43° | 53° | — | — |
| 2013 | 79° | 47° | 63° | — | — |
| 2012 | 58° | 43° | 50° | 0.1" | — |
| 2011 | 58° | 37° | 47° | 0.15" | — |
| 2010 | 57° | 51° | 54° | 0.03" | — |
| 2009 | 71° | 41° | 56° | — | — |
| 2008 | 51° | 45° | 48° | 3.68" | — |
| 2007 | 65° | 35° | 50° | — | — |
| 2006 | 69° | 41° | 55° | — | — |
| 2005 | 66° | 40° | 53° | — | — |
| 2004 | 79° | 41° | 60° | — | — |
| 2003 | 65° | 36° | 50° | — | — |
| 2002 | 66° | 46° | 56° | — | — |
| 2001 | 58° | 31° | 44° | 0.03" | — |
| 2000 | 62° | 40° | 51° | — | — |
| 1999 | 74° | 43° | 58° | — | — |
| 1998 | 80° | 37° | 59° | — | — |
| 1997 | 70° | 44° | 57° | — | — |
| 1996 | 69° | 52° | 60° | — | — |
| 1995 | 73° | 44° | 59° | — | — |
| 1994 | 66° | 37° | 52° | — | — |
| 1993 | 59° | 35° | 47° | 0.56" | — |
| 1992 | 63° | 34° | 48° | — | — |
| 1991 | 80° | 45° | 62° | — | — |
| 1990 | 70° | 35° | 52° | — | — |
| 1989 | 69° | 40° | 54° | — | — |
| 1988 | 56° | 44° | 50° | 0.46" | — |
| 1987coldest | 55° | 29° | 42° | — | — |
| 1986 | 68° | 42° | 55° | — | — |
| 1985 | 73° | 38° | 55° | — | — |
| 1984 | 59° | 30° | 45° | — | — |
| 1983 | 72° | 40° | 56° | — | — |
| 1982 | 66° | 35° | 51° | — | — |
| 1981 | 74° | 42° | 58° | — | — |
| 1980warmest | 83° | 47° | 65° | — | — |
| 1979 | 75° | 33° | 54° | — | — |
| 1978 | 68° | 35° | 52° | — | — |
| 1977 | 67° | 44° | 55° | — | — |
| 1976 | 79° | 39° | 59° | — | — |
| 1975 | 68° | 39° | 54° | — | — |
| 1974 | 75° | 39° | 57° | — | — |
| 1973 | 71° | 38° | 54° | — | — |
| 1972 | 65° | 31° | 48° | — | — |
| 1971 | 57° | 31° | 44° | — | — |
55 years of data from RIVERSIDE MUNI AP