Weather on December 21
San Ramon, CA
55 Years of Data
Avg High
54°F
Avg Low
39°F
Warmest
2005
60°F avg
Coldest
1990
27°F avg
About This Date
December 21st in San Ramon, CA typically brings cool winter weather, with average highs around 54°F and lows near 39°F. Over 55 years of records, the warmest December 21st was in 2005 (60°F average), while the coldest was 1990 (27°F) — a 33°F range across recorded history. Rain or other precipitation has occurred on about 29% of December 21st dates historically, with the wettest December 21st recording 2.36" of rain. The last decade has been 2.4°F warmer on this date compared to 20-30 years ago.
The last decade has been 2.4°F warmer on this date compared to 20-30 years ago.
Planning for December 21st in San Ramon, CA? Bring layers as temperatures can vary throughout the day.
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 55° | 53° | 54° | 0.43" | — |
| 2024 | 54° | 38° | 46° | 0.03" | — |
| 2023 | 54° | 46° | 50° | 1.37" | — |
| 2022 | 55° | 41° | 48° | — | — |
| 2021 | 53° | 32° | 43° | — | — |
| 2020 | 58° | 50° | 54° | — | — |
| 2019 | 58° | 49° | 53° | — | — |
| 2018 | 58° | 47° | 52° | 0.33" | — |
| 2017 | 45° | 36° | 40° | — | — |
| 2016 | 56° | 42° | 49° | — | — |
| 2015 | 48° | 41° | 45° | 0.99" | — |
| 2014 | 56° | 49° | 52° | 0.05" | — |
| 2013 | 57° | 43° | 50° | — | — |
| 2012 | 49° | 41° | 45° | 0.03" | — |
| 2011 | 58° | 49° | 53° | — | — |
| 2010 | 42° | 39° | 41° | 0.03" | — |
| 2009 | 62° | 46° | 54° | — | — |
| 2008 | 47° | 37° | 42° | — | — |
| 2007 | 48° | 28° | 38° | — | — |
| 2006 | 51° | 37° | 44° | — | — |
| 2005warmest | 67° | 53° | 60° | — | — |
| 2004 | 64° | 38° | 51° | — | — |
| 2003 | 52° | 39° | 45° | 0.46" | — |
| 2002 | 44° | 36° | 40° | 1.7" | — |
| 2001 | 42° | 29° | 35° | 2.16" | — |
| 2000 | 56° | 39° | 47° | — | — |
| 1999 | 69° | 47° | 58° | — | — |
| 1998 | 44° | 26° | 35° | — | — |
| 1997 | 53° | 39° | 46° | — | — |
| 1996 | 49° | 47° | 48° | — | — |
| 1995 | 48° | 34° | 41° | — | — |
| 1994 | 45° | 37° | 41° | — | — |
| 1993 | 43° | 29° | 36° | — | — |
| 1992 | 54° | 40° | 47° | — | — |
| 1991 | 52° | 36° | 44° | — | — |
| 1990coldest | 34° | 21° | 27° | — | — |
| 1989 | 57° | 35° | 46° | — | — |
| 1988 | 44° | 30° | 37° | 2.03" | — |
| 1987 | 53° | 38° | 45° | — | — |
| 1986 | 64° | 34° | 49° | — | — |
| 1985 | 70° | 48° | 59° | — | — |
| 1984 | 48° | 32° | 40° | — | — |
| 1983 | 48° | 33° | 41° | — | — |
| 1982 | 50° | 43° | 46° | 2.36" | — |
| 1981 | 54° | 42° | 48° | 0.3" | — |
| 1980 | 64° | 49° | 56° | — | — |
| 1979 | 49° | 45° | 47° | 0.53" | — |
| 1978 | 52° | 33° | 42° | — | — |
| 1977 | 59° | 44° | 52° | — | — |
| 1976 | 71° | 43° | 57° | — | — |
| 1975 | 63° | 39° | 51° | — | — |
| 1974 | 53° | 30° | 42° | — | — |
| 1973 | 60° | 40° | 50° | 0.76" | — |
| 1972 | 59° | 46° | 53° | — | — |
| 1971 | 57° | 34° | 45° | — | — |
55 years of data from LIVERMORE CALIFORNIA