Weather on December 20
San Bernardino, CA
55 Years of Data
Avg High
66°F
Avg Low
41°F
Warmest
1999
68°F avg
Coldest
1990
41°F avg
About This Date
December 20th in San Bernardino, CA typically brings mild winter weather, with average highs around 66°F and lows near 41°F — a 25°F daily swing. Over 47 years of records, the warmest December 20th was in 1999 (68°F average), while the coldest was 1990 (41°F) — a 27°F range across recorded history. Rain or other precipitation has occurred on about 17% of December 20th dates historically, with the wettest December 20th recording 4.06" of rain.
Planning for December 20th in San Bernardino, CA? Great weather for outdoor activities.
Cooling Trend
0.5°F per decade on this date
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 73° | 45° | 59° | — | — |
| 2016 | 63° | 50° | 56° | — | — |
| 2015 | 53° | 41° | 47° | — | — |
| 2014 | 57° | 44° | 51° | — | — |
| 2013 | 60° | 40° | 50° | 0.03" | — |
| 2012 | 63° | 31° | 47° | — | — |
| 2011 | 66° | 38° | 52° | — | — |
| 2010 | 57° | 50° | 54° | 4.06" | — |
| 2009 | 68° | 44° | 56° | — | — |
| 2008 | 59° | 32° | 46° | — | — |
| 2007 | 55° | 48° | 52° | 0.03" | — |
| 2006 | 60° | 30° | 45° | — | — |
| 2005 | 73° | 44° | 59° | — | — |
| 2004 | 72° | 41° | 56° | — | — |
| 2003 | 64° | 45° | 54° | — | — |
| 2002 | 62° | 33° | 48° | 1.02" | — |
| 2001 | 77° | 36° | 56° | 0.03" | — |
| 2000 | 75° | 40° | 57° | — | — |
| 1999warmest | 79° | 57° | 68° | — | — |
| 1998 | 57° | 47° | 52° | — | — |
| 1997 | 64° | 37° | 51° | — | — |
| 1996 | 69° | 36° | 52° | — | — |
| 1995 | 61° | 40° | 50° | — | — |
| 1994 | 76° | 54° | 65° | — | — |
| 1993 | 62° | 40° | 51° | — | — |
| 1992 | 58° | 31° | 44° | — | — |
| 1991 | 64° | 49° | 56° | — | — |
| 1990coldest | 50° | 32° | 41° | — | — |
| 1989 | 65° | 36° | 50° | — | — |
| 1988 | 55° | 39° | 47° | — | — |
| 1987 | 60° | 36° | 48° | — | — |
| 1986 | 62° | 50° | 56° | 0.33" | — |
| 1985 | 78° | 43° | 60° | — | — |
| 1984 | 64° | 42° | 53° | 1.27" | — |
| 1983 | 60° | 50° | 55° | — | — |
| 1982 | 78° | 40° | 59° | — | — |
| 1981 | 69° | 44° | 57° | — | — |
| 1980 | 81° | 45° | 63° | — | — |
| 1979 | 68° | 40° | 54° | — | — |
| 1978 | 59° | 32° | 46° | — | — |
| 1977 | 62° | 37° | 50° | — | — |
| 1976 | 74° | 39° | 56° | — | — |
| 1975 | 68° | 37° | 53° | 0.58" | — |
| 1974 | 76° | 39° | 57° | — | — |
| 1973 | 73° | 36° | 54° | — | — |
| 1972 | 80° | 50° | 65° | — | — |
| 1971 | 62° | 34° | 48° | — | — |
47 years of data from NORTON AFB