Weather on December 20
San Francisco, CA
55 Years of Data
About This Date
December 20th in San Francisco, CA typically brings cool winter weather, with average highs around 56°F and lows near 46°F. Over 55 years of records, the warmest December 20th was in 1999 (63°F average), while the coldest was 1990 (41°F) — a 22°F range across recorded history. Rain or other precipitation has occurred on about 35% of December 20th dates historically, with the wettest December 20th recording 3.3" 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 Francisco, CA? Bring layers as temperatures can vary throughout the day. Consider bringing rain gear or an umbrella.
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 62° | 57° | 60° | 0.36" | — |
| 2024 | 54° | 46° | 50° | — | — |
| 2023 | 59° | 53° | 56° | 3.07" | — |
| 2022 | 54° | 44° | 49° | — | — |
| 2021 | 54° | 45° | 49° | — | — |
| 2020 | 58° | 47° | 52° | — | — |
| 2019 | 59° | 50° | 55° | — | — |
| 2018 | 55° | 50° | 53° | — | — |
| 2017 | 54° | 47° | 50° | 0.33" | — |
| 2016 | 56° | 45° | 50° | — | — |
| 2015 | 56° | 45° | 50° | 2.74" | — |
| 2014 | 61° | 55° | 58° | 0.1" | — |
| 2013 | 58° | 44° | 51° | — | — |
| 2012 | 58° | 43° | 50° | — | — |
| 2011 | 59° | 45° | 52° | — | — |
| 2010 | 54° | 49° | 51° | 0.1" | — |
| 2009 | 61° | 48° | 54° | 0.05" | — |
| 2008 | 51° | 41° | 46° | — | — |
| 2007 | 54° | 47° | 50° | 1.22" | — |
| 2006 | 54° | 41° | 47° | — | — |
| 2005 | 65° | 52° | 58° | 0.43" | — |
| 2004 | 53° | 43° | 48° | — | — |
| 2003 | 56° | 49° | 52° | 1.24" | — |
| 2002 | 56° | 46° | 51° | 1.8" | — |
| 2001 | 54° | 47° | 50° | 1.63" | — |
| 2000 | 63° | 49° | 56° | — | — |
| 1999warmest | 72° | 55° | 63° | — | — |
| 1998 | 44° | 38° | 41° | 0.23" | — |
| 1997 | 58° | 45° | 51° | 0.05" | — |
| 1996 | 54° | 43° | 48° | 0.15" | — |
| 1995 | 60° | 47° | 53° | — | — |
| 1994 | 54° | 42° | 48° | — | — |
| 1993 | 50° | 40° | 45° | — | — |
| 1992 | 57° | 47° | 52° | — | — |
| 1991 | 60° | 42° | 51° | — | — |
| 1990coldest | 49° | 34° | 41° | — | — |
| 1989 | 50° | 42° | 46° | — | — |
| 1988 | 52° | 46° | 49° | 3.3" | — |
| 1987 | 52° | 45° | 48° | — | — |
| 1986 | 59° | 45° | 52° | — | — |
| 1985 | 60° | 42° | 51° | — | — |
| 1984 | 55° | 44° | 50° | — | — |
| 1983 | 53° | 43° | 48° | — | — |
| 1982 | 58° | 50° | 54° | 0.79" | — |
| 1981 | 60° | 53° | 57° | 3.25" | — |
| 1980 | 60° | 51° | 56° | — | — |
| 1979 | 55° | 51° | 53° | 0.3" | — |
| 1978 | 51° | 41° | 46° | — | — |
| 1977 | 54° | 49° | 51° | — | — |
| 1976 | 65° | 48° | 56° | — | — |
| 1975 | 56° | 46° | 51° | — | — |
| 1974 | 49° | 44° | 46° | — | — |
| 1973 | 61° | 48° | 54° | — | — |
| 1972 | 57° | 52° | 54° | — | — |
| 1971 | 48° | 44° | 46° | — | — |