Weather on December 20
San Jose, CA
55 Years of Data
Avg High
58°F
Avg Low
41°F
Warmest
2025
63°F avg
Coldest
1990
37°F avg
About This Date
December 20th in San Jose, CA typically brings cool winter weather, with average highs around 58°F and lows near 41°F. Over 55 years of records, the warmest December 20th was in 2025 (63°F average), while the coldest was 1990 (37°F) — a 26°F range across recorded history. Rain or other precipitation has occurred on about 27% of December 20th dates historically, with the wettest December 20th recording 1.88" of rain. The last decade has been 1.0°F warmer on this date compared to 20-30 years ago.
The last decade has been 1.0°F warmer on this date compared to 20-30 years ago.
Planning for December 20th in San Jose, CA? Bring layers as temperatures can vary throughout the day.
Warming Trend
0.7°F per decade on this date
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025warmest | 66° | 60° | 63° | — | — |
| 2024 | 59° | 41° | 50° | — | — |
| 2023 | 60° | 53° | 57° | 1.88" | — |
| 2022 | 58° | 44° | 51° | — | — |
| 2021 | 57° | 38° | 47° | — | — |
| 2020 | 62° | 35° | 49° | — | — |
| 2019 | 65° | 45° | 55° | — | — |
| 2018 | 55° | 46° | 51° | — | — |
| 2017 | 56° | 41° | 48° | 0.18" | — |
| 2016 | 60° | 35° | 48° | — | — |
| 2015 | 54° | 37° | 45° | — | — |
| 2014 | 62° | 54° | 58° | 0.15" | — |
| 2013 | 60° | 35° | 48° | — | — |
| 2012 | 59° | 36° | 47° | — | — |
| 2011 | 60° | 34° | 47° | — | — |
| 2010 | 53° | 47° | 50° | — | — |
| 2009 | 69° | 42° | 56° | 0.05" | — |
| 2008 | 52° | 33° | 42° | — | — |
| 2007 | 55° | 42° | 49° | 0.58" | — |
| 2006 | 54° | 35° | 44° | — | — |
| 2005 | 70° | 49° | 59° | — | — |
| 2004 | 51° | 39° | 45° | — | — |
| 2003 | 60° | 52° | 56° | 1.55" | — |
| 2002 | 56° | 43° | 49° | 1.6" | — |
| 2001 | 56° | 48° | 52° | 1.27" | — |
| 2000 | 62° | 39° | 51° | — | — |
| 1999 | 75° | 48° | 62° | — | — |
| 1998 | 45° | 35° | 40° | 0.15" | — |
| 1997 | 59° | 39° | 49° | 0.05" | — |
| 1996 | 57° | 36° | 46° | — | — |
| 1995 | 58° | 47° | 52° | — | — |
| 1994 | 53° | 39° | 46° | — | — |
| 1993 | 50° | 32° | 41° | — | — |
| 1992 | 57° | 32° | 45° | — | — |
| 1991 | 57° | 39° | 48° | — | — |
| 1990coldest | 43° | 32° | 37° | — | — |
| 1989 | 53° | 39° | 46° | — | — |
| 1988 | 50° | 44° | 47° | 1.78" | — |
| 1987 | 56° | 36° | 46° | — | — |
| 1986 | 57° | 44° | 51° | — | — |
| 1985 | 60° | 35° | 48° | — | — |
| 1984 | 55° | 34° | 44° | 0.05" | — |
| 1983 | 56° | 44° | 50° | — | — |
| 1982 | 60° | 46° | 53° | 0.13" | — |
| 1981 | 65° | 58° | 61° | 0.28" | — |
| 1980 | 63° | 46° | 54° | — | — |
| 1979 | 58° | 45° | 51° | 0.33" | — |
| 1978 | 52° | 32° | 42° | — | — |
| 1977 | 55° | 39° | 47° | — | — |
| 1976 | 58° | 36° | 47° | — | — |
| 1975 | 58° | 33° | 45° | — | — |
| 1974 | 53° | 37° | 45° | — | — |
| 1973 | 61° | 40° | 50° | — | — |
| 1972 | 62° | 55° | 59° | — | — |
| 1971 | 53° | 32° | 43° | — | — |
55 years of data from SAN JOSE