Weather on December 18
Riverside, CA
55 Years of Data
Avg High
68°F
Avg Low
42°F
Warmest
2024
69°F avg
Coldest
2006
43°F avg
About This Date
December 18th in Riverside, CA typically brings mild winter weather, with average highs around 68°F and lows near 42°F — a 26°F daily swing. Over 55 years of records, the warmest December 18th was in 2024 (69°F average), while the coldest was 2006 (43°F) — a 26°F range across recorded history. Rain or other precipitation has occurred on about 16% of December 18th dates historically, with the wettest December 18th recording 1.57" 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 18th in Riverside, CA? Great weather for outdoor activities.
Warming Trend
0.6°F per decade on this date
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 80° | 47° | 63° | — | — |
| 2024warmest | 83° | 55° | 69° | — | — |
| 2023 | 73° | 53° | 63° | — | — |
| 2022 | 64° | 37° | 51° | — | — |
| 2021 | 70° | 42° | 56° | — | — |
| 2020 | 69° | 41° | 55° | — | — |
| 2019 | 62° | 36° | 49° | — | — |
| 2018 | 66° | 48° | 57° | — | — |
| 2017 | 71° | 44° | 58° | — | — |
| 2016 | 61° | 36° | 48° | — | — |
| 2015 | 74° | 40° | 57° | — | — |
| 2014 | 62° | 45° | 53° | — | — |
| 2013 | 72° | 53° | 62° | — | — |
| 2012 | 59° | 44° | 52° | 0.13" | — |
| 2011 | 59° | 42° | 51° | — | — |
| 2010 | 61° | 54° | 57° | 0.56" | — |
| 2009 | 80° | 47° | 63° | — | — |
| 2008 | 55° | 37° | 46° | 0.05" | — |
| 2007 | 62° | 55° | 59° | — | — |
| 2006coldest | 55° | 31° | 43° | 0.03" | — |
| 2005 | 62° | 45° | 53° | — | — |
| 2004 | 79° | 40° | 59° | — | — |
| 2003 | 81° | 44° | 62° | — | — |
| 2002 | 58° | 36° | 47° | — | — |
| 2001 | 72° | 30° | 51° | — | — |
| 2000 | 72° | 56° | 64° | — | — |
| 1999 | 76° | 40° | 58° | — | — |
| 1998 | 60° | 40° | 50° | — | — |
| 1997 | 63° | 40° | 51° | 0.25" | — |
| 1996 | 70° | 42° | 56° | — | — |
| 1995 | 70° | 35° | 52° | — | — |
| 1994 | 82° | 36° | 59° | — | — |
| 1993 | 66° | 34° | 50° | — | — |
| 1992 | 60° | 43° | 51° | 0.2" | — |
| 1991 | 61° | 53° | 57° | — | — |
| 1990 | 64° | 34° | 49° | — | — |
| 1989 | 63° | 39° | 51° | — | — |
| 1988 | 55° | 41° | 48° | 0.61" | — |
| 1987 | 67° | 42° | 54° | — | — |
| 1986 | 68° | 37° | 53° | — | — |
| 1985 | 80° | 43° | 61° | — | — |
| 1984 | 53° | 36° | 44° | 1.27" | — |
| 1983 | 67° | 45° | 56° | — | — |
| 1982 | 71° | 33° | 52° | — | — |
| 1981 | 75° | 42° | 59° | — | — |
| 1980 | 70° | 40° | 55° | — | — |
| 1979 | 78° | 40° | 59° | — | — |
| 1978 | 54° | 42° | 48° | 1.57" | — |
| 1977 | 62° | 52° | 57° | — | — |
| 1976 | 67° | 37° | 52° | — | — |
| 1975 | 71° | 32° | 52° | — | — |
| 1974 | 75° | 37° | 56° | — | — |
| 1973 | 71° | 38° | 54° | — | — |
| 1972 | 77° | 44° | 61° | — | — |
| 1971 | 66° | 43° | 54° | — | — |
55 years of data from RIVERSIDE MUNI AP