Weather on December 21
San Leandro, CA
55 Years of Data
Avg High
56°F
Avg Low
43°F
Warmest
1999
60°F avg
Coldest
1998
34°F avg
About This Date
December 21st in San Leandro, CA typically brings cool winter weather, with average highs around 56°F and lows near 43°F. Over 53 years of records, the warmest December 21st was in 1999 (60°F average), while the coldest was 1998 (34°F) — a 26°F range across recorded history. Rain or other precipitation has occurred on about 13% of December 21st dates historically, with the wettest December 21st recording 2.79" 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 21st in San Leandro, CA? Bring layers as temperatures can vary throughout the day.
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 57° | 55° | 56° | — | — |
| 2024 | 54° | 47° | 50° | — | — |
| 2023 | 59° | 48° | 54° | — | — |
| 2022 | 54° | 42° | 48° | — | — |
| 2021 | 48° | 36° | 42° | — | — |
| 2020 | 55° | 47° | 51° | — | — |
| 2019 | 55° | 48° | 52° | — | — |
| 2018 | 53° | 46° | 50° | — | — |
| 2017 | 50° | 39° | 45° | — | — |
| 2016 | 55° | 49° | 52° | — | — |
| 2015 | 54° | 47° | 50° | — | — |
| 2014 | 60° | 53° | 57° | — | — |
| 2013 | 59° | 44° | 52° | — | — |
| 2012 | 51° | 46° | 49° | — | — |
| 2011 | 54° | 43° | 48° | — | — |
| 2010 | 53° | 44° | 49° | — | — |
| 2009 | 51° | 41° | 46° | — | — |
| 2008 | 51° | 43° | 47° | 0.94" | — |
| 2007 | 49° | 35° | 42° | — | — |
| 2006 | 52° | 41° | 46° | 0.99" | — |
| 2005 | 61° | 57° | 59° | — | — |
| 2004 | 64° | 40° | 52° | — | — |
| 2003 | 54° | 47° | 50° | — | — |
| 2002 | 57° | 44° | 51° | — | — |
| 2001 | 50° | 42° | 46° | — | — |
| 2000 | 55° | 45° | 50° | — | — |
| 1999warmest | 64° | 56° | 60° | — | — |
| 1998coldest | 40° | 28° | 34° | — | — |
| 1997 | 53° | 37° | 45° | — | — |
| 1996 | 50° | 47° | 48° | — | — |
| 1995 | 61° | 54° | 57° | — | — |
| 1994 | 61° | 53° | 57° | — | — |
| 1993 | 46° | 31° | 38° | — | — |
| 1992 | 53° | 40° | 46° | — | — |
| 1989 | 58° | 38° | 48° | — | — |
| 1988 | 51° | 38° | 44° | 2.79" | — |
| 1987 | 59° | 38° | 48° | — | — |
| 1986 | 60° | 41° | 51° | — | — |
| 1985 | 64° | 36° | 50° | — | — |
| 1984 | 56° | 38° | 47° | — | — |
| 1983 | 52° | 38° | 45° | — | — |
| 1982 | 59° | 45° | 52° | 2.31" | — |
| 1981 | 60° | 49° | 54° | 0.71" | — |
| 1980 | 66° | 50° | 58° | — | — |
| 1979 | 57° | 50° | 54° | 0.36" | — |
| 1978 | 54° | 34° | 44° | — | — |
| 1977 | 63° | 43° | 53° | — | — |
| 1976 | 69° | 47° | 58° | — | — |
| 1975 | 55° | 36° | 45° | — | — |
| 1974 | 56° | 37° | 46° | — | — |
| 1973 | 60° | 42° | 51° | 0.48" | — |
| 1972 | 57° | 47° | 52° | — | — |
| 1971 | 51° | 37° | 44° | — | — |
53 years of data from UPPER SAN LEANDRO FILTERS