Weather on December 20
San Ramon, CA
55 Years of Data
Avg High
54°F
Avg Low
39°F
Warmest
1985
60°F avg
Coldest
1990
34°F avg
About This Date
December 20th in San Ramon, CA typically brings cool winter weather, with average highs around 54°F and lows near 39°F. Over 54 years of records, the warmest December 20th was in 1985 (60°F average), while the coldest was 1990 (34°F) — a 26°F range across recorded history. Rain or other precipitation has occurred on about 28% of December 20th dates historically, with the wettest December 20th recording 4.93" of rain. Temperatures on this date have remained relatively stable over the past several decades.
Temperatures on this date have remained relatively stable over the past several decades.
Planning for December 20th in San Ramon, CA? Bring layers as temperatures can vary throughout the day.
Cooling Trend
0.5°F per decade on this date
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 56° | 50° | 53° | 0.15" | — |
| 2024 | 49° | 38° | 43° | 0.03" | — |
| 2023 | 57° | 48° | 53° | 0.43" | — |
| 2022 | 52° | 39° | 45° | — | — |
| 2021 | 47° | 37° | 42° | — | — |
| 2020 | 58° | 44° | 51° | — | — |
| 2019 | 51° | 43° | 47° | 0.03" | — |
| 2018 | 52° | 45° | 48° | — | — |
| 2017 | 58° | 34° | 46° | 0.86" | — |
| 2016 | 47° | 34° | 40° | — | — |
| 2015 | 50° | 33° | 42° | — | — |
| 2014 | 50° | 46° | 48° | 0.99" | — |
| 2013 | 63° | 34° | 48° | — | — |
| 2012 | 46° | 36° | 41° | — | — |
| 2011 | 56° | 44° | 50° | — | — |
| 2010 | 51° | 39° | 45° | 2.01" | — |
| 2009 | 63° | 48° | 55° | — | — |
| 2008 | 43° | 30° | 36° | — | — |
| 2007 | 50° | 32° | 41° | 1.17" | — |
| 2006 | 55° | 33° | 44° | — | — |
| 2005 | 68° | 47° | 57° | — | — |
| 2004 | 55° | 33° | 44° | — | — |
| 2003 | 57° | 39° | 48° | 1.02" | — |
| 2002 | 45° | 31° | 38° | 3.3" | — |
| 2001 | 53° | 34° | 43° | 0.53" | — |
| 2000 | 62° | 42° | 52° | — | — |
| 1999 | 64° | 52° | 58° | — | — |
| 1998 | 43° | 31° | 37° | — | — |
| 1997 | 54° | 40° | 47° | — | — |
| 1996 | 47° | 31° | 39° | — | — |
| 1995 | 60° | 42° | 51° | — | — |
| 1994 | 45° | 39° | 42° | — | — |
| 1993 | 41° | 31° | 36° | — | — |
| 1992 | 52° | 39° | 45° | — | — |
| 1991 | 54° | 40° | 47° | — | — |
| 1990coldest | 42° | 26° | 34° | — | — |
| 1989 | 56° | 35° | 45° | — | — |
| 1988 | 46° | 40° | 43° | 0.43" | — |
| 1987 | 55° | 35° | 45° | — | — |
| 1985warmest | 71° | 49° | 60° | — | — |
| 1984 | 50° | 33° | 42° | — | — |
| 1983 | 46° | 35° | 41° | — | — |
| 1982 | 60° | 44° | 52° | 0.15" | — |
| 1981 | 58° | 50° | 54° | 4.93" | — |
| 1980 | 59° | 40° | 49° | — | — |
| 1979 | 50° | 46° | 48° | 0.08" | — |
| 1978 | 49° | 32° | 40° | — | — |
| 1977 | 51° | 34° | 42° | — | — |
| 1976 | 70° | 47° | 58° | — | — |
| 1975 | 61° | 47° | 54° | — | — |
| 1974 | 56° | 42° | 49° | — | — |
| 1973 | 62° | 40° | 51° | — | — |
| 1972 | 58° | 46° | 52° | — | — |
| 1971 | 57° | 41° | 49° | — | — |
54 years of data from LIVERMORE CALIFORNIA