Weather on December 15
San Ramon, CA
55 Years of Data
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" | — |
San Ramon, CA Temperature Range by Month
Average monthly highs and lows. The shaded band shows the typical daily temperature range.
San Ramon, CA Monthly Precipitation
Average rainfall and snowfall per month, in inches.
San Ramon, CA Daily Temperature Calendar
Average daily high temperature for every day of the year. Each cell is the climatological mean for that calendar day across 55 years of NOAA data.
Best Time to Visit San Ramon, CA
San Ramon, CA has no months that meet our "pleasant" threshold — every season has tradeoffs.