Weather on December 20
Riverside, CA
55 Years of Data
Avg High
67°F
Avg Low
42°F
Warmest
1999
65°F avg
Coldest
1978
43°F avg
About This Date
December 20th in Riverside, CA typically brings mild winter weather, with average highs around 67°F and lows near 42°F — a 25°F daily swing. Over 55 years of records, the warmest December 20th was in 1999 (65°F average), while the coldest was 1978 (43°F) — a 22°F range across recorded history. Rain or other precipitation has occurred on about 13% of December 20th dates historically, with the wettest December 20th recording 1.55" of rain. The last decade has been 2.0°F warmer on this date compared to 20-30 years ago.
The last decade has been 2.0°F warmer on this date compared to 20-30 years ago.
Planning for December 20th in Riverside, CA? Great weather for outdoor activities.
Warming Trend
0.8°F per decade on this date
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 67° | 42° | 54° | — | — |
| 2024 | 79° | 46° | 62° | — | — |
| 2023 | 69° | 53° | 61° | 0.56" | — |
| 2022 | 67° | 40° | 53° | — | — |
| 2021 | 70° | 35° | 52° | — | — |
| 2020 | 84° | 41° | 63° | — | — |
| 2019 | 74° | 41° | 57° | — | — |
| 2018 | 80° | 46° | 63° | — | — |
| 2017 | 63° | 40° | 51° | — | — |
| 2016 | 76° | 50° | 63° | — | — |
| 2015 | 60° | 43° | 51° | — | — |
| 2014 | 61° | 44° | 52° | — | — |
| 2013 | 64° | 53° | 59° | — | — |
| 2012 | 69° | 36° | 52° | — | — |
| 2011 | 70° | 40° | 55° | — | — |
| 2010 | 60° | 54° | 57° | 1.55" | — |
| 2009 | 71° | 48° | 60° | — | — |
| 2008 | 63° | 33° | 48° | — | — |
| 2007 | 57° | 46° | 52° | 0.13" | — |
| 2006 | 62° | 32° | 47° | — | — |
| 2005 | 79° | 50° | 64° | — | — |
| 2004 | 71° | 38° | 54° | — | — |
| 2003 | 68° | 45° | 56° | — | — |
| 2002 | 60° | 44° | 52° | 1.22" | — |
| 2001 | 58° | 39° | 48° | — | — |
| 2000 | 78° | 40° | 59° | — | — |
| 1999warmest | 78° | 52° | 65° | — | — |
| 1998 | 57° | 43° | 50° | — | — |
| 1997 | 71° | 39° | 55° | — | — |
| 1996 | 71° | 41° | 56° | — | — |
| 1995 | 62° | 42° | 52° | — | — |
| 1994 | 81° | 39° | 60° | — | — |
| 1993 | 63° | 38° | 50° | — | — |
| 1992 | 60° | 31° | 45° | — | — |
| 1991 | 66° | 53° | 60° | — | — |
| 1990 | 52° | 38° | 45° | — | — |
| 1989 | 67° | 35° | 51° | — | — |
| 1988 | 59° | 39° | 49° | 0.1" | — |
| 1987 | 63° | 36° | 49° | — | — |
| 1986 | 64° | 50° | 57° | 0.03" | — |
| 1985 | 81° | 44° | 62° | — | — |
| 1984 | 55° | 42° | 49° | — | — |
| 1983 | 64° | 49° | 56° | — | — |
| 1982 | 72° | 39° | 55° | — | — |
| 1981 | 62° | 42° | 52° | — | — |
| 1980 | 79° | 45° | 62° | — | — |
| 1979 | 66° | 40° | 53° | — | — |
| 1978coldest | 52° | 35° | 43° | 1.24" | — |
| 1977 | 64° | 40° | 52° | — | — |
| 1976 | 69° | 39° | 54° | — | — |
| 1975 | 69° | 38° | 53° | — | — |
| 1974 | 70° | 37° | 53° | — | — |
| 1973 | 72° | 42° | 57° | — | — |
| 1972 | 69° | 46° | 58° | — | — |
| 1971 | 61° | 36° | 48° | — | — |
55 years of data from RIVERSIDE CITRUS EXP