Weather on December 15
San Ramon, CA
55 Years of Data
Avg High
54°F
Avg Low
40°F
Warmest
2025
62°F avg
Coldest
1972
35°F avg
About This Date
December 15th in San Ramon, CA typically brings cool winter weather, with average highs around 54°F and lows near 40°F. Over 55 years of records, the warmest December 15th was in 2025 (62°F average), while the coldest was 1972 (35°F) — a 27°F range across recorded history. Precipitation has occurred on 27% of recorded December 15th dates, with snow falling 2% of the time (heaviest snowfall: 1.5"). 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 15th in San Ramon, CA? Bring layers as temperatures can vary throughout the day.
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025warmest | 69° | 56° | 62° | — | — |
| 2024 | 47° | 36° | 41° | 0.03" | — |
| 2023 | 56° | 43° | 49° | — | — |
| 2022 | 48° | 35° | 42° | — | — |
| 2021 | 41° | 32° | 37° | 0.03" | — |
| 2020 | 51° | 41° | 46° | — | — |
| 2019 | 56° | 42° | 49° | — | — |
| 2018 | 53° | 47° | 50° | 0.15" | — |
| 2017 | 65° | 54° | 59° | — | — |
| 2016 | 53° | 49° | 51° | 1.93" | — |
| 2015 | 48° | 36° | 42° | — | — |
| 2014 | 52° | 41° | 46° | 2.79" | — |
| 2013 | 55° | 47° | 51° | — | — |
| 2012 | 42° | 34° | 38° | — | — |
| 2011 | 52° | 39° | 45° | 0.3" | — |
| 2010 | 50° | 38° | 44° | 1.04" | — |
| 2009 | 50° | 42° | 46° | — | — |
| 2008 | 38° | 34° | 36° | 1.75" | — |
| 2007 | 55° | 26° | 41° | — | — |
| 2006 | 55° | 44° | 50° | — | — |
| 2005 | 60° | 38° | 49° | — | — |
| 2004 | 62° | 48° | 55° | — | — |
| 2003 | 53° | 30° | 42° | — | — |
| 2002 | 53° | 41° | 47° | 3.2" | — |
| 2001 | 48° | 29° | 38° | — | — |
| 2000 | 63° | 46° | 54° | — | — |
| 1999 | 61° | 35° | 48° | — | — |
| 1998 | 60° | 49° | 54° | — | — |
| 1997 | 58° | 38° | 48° | — | — |
| 1996 | 50° | 43° | 46° | — | — |
| 1995 | 58° | 45° | 51° | — | — |
| 1994 | 52° | 40° | 46° | — | — |
| 1993 | 55° | 35° | 45° | — | — |
| 1992 | 56° | 37° | 46° | — | — |
| 1991 | 46° | 34° | 40° | — | — |
| 1990 | 46° | 41° | 44° | — | — |
| 1989 | 63° | 41° | 52° | — | — |
| 1988 | 68° | 42° | 55° | — | — |
| 1987 | 47° | 33° | 40° | — | — |
| 1986 | 50° | 35° | 43° | 0.56" | — |
| 1985 | 56° | 41° | 48° | — | — |
| 1984 | 56° | 38° | 47° | 0.18" | 1.5" |
| 1983 | 59° | 48° | 54° | — | — |
| 1982 | 51° | 42° | 47° | — | — |
| 1981 | 56° | 48° | 52° | 0.03" | — |
| 1980 | 68° | 52° | 60° | — | — |
| 1979 | 63° | 40° | 51° | — | — |
| 1978 | 66° | 43° | 54° | — | — |
| 1977 | 55° | 42° | 49° | 3.51" | — |
| 1976 | 65° | 47° | 56° | — | — |
| 1975 | 47° | 33° | 40° | — | — |
| 1974 | 52° | 40° | 46° | 0.18" | — |
| 1973 | 56° | 39° | 47° | — | — |
| 1972coldest | 46° | 25° | 35° | — | — |
| 1971 | 42° | 30° | 36° | 0.08" | — |
55 years of data from LIVERMORE CALIFORNIA