Weather on December 21
Pomona, CA
55 Years of Data
Avg High
67°F
Avg Low
43°F
Warmest
2020
66°F avg
Coldest
1998
40°F avg
About This Date
December 21st in Pomona, CA typically brings mild winter weather, with average highs around 67°F and lows near 43°F. Over 52 years of records, the warmest December 21st was in 2020 (66°F average), while the coldest was 1998 (40°F) — a 26°F range across recorded history. Rain or other precipitation has occurred on about 6% of December 21st dates historically, with the wettest December 21st recording 2.59" of rain. The last decade has been 3.3°F warmer on this date compared to 20-30 years ago.
The last decade has been 3.3°F warmer on this date compared to 20-30 years ago.
Planning for December 21st in Pomona, CA? Great weather for outdoor activities.
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 76° | 47° | 61° | — | — |
| 2024 | 69° | 46° | 58° | — | — |
| 2023 | 67° | 53° | 60° | — | — |
| 2022 | 70° | 43° | 56° | — | — |
| 2021 | 69° | 48° | 59° | — | — |
| 2020warmest | 80° | 51° | 66° | — | — |
| 2019 | 70° | 48° | 59° | — | — |
| 2018 | 69° | 50° | 60° | — | — |
| 2017 | 58° | 36° | 47° | — | — |
| 2016 | 63° | 50° | 56° | — | — |
| 2015 | 57° | 39° | 48° | — | — |
| 2014 | 67° | 43° | 55° | — | — |
| 2013 | 59° | 38° | 48° | — | — |
| 2012 | 67° | 36° | 51° | — | — |
| 2011 | 62° | 39° | 51° | — | — |
| 2010 | 54° | 50° | 52° | 2.51" | — |
| 2009 | 64° | 48° | 56° | — | — |
| 2008 | 64° | 38° | 51° | — | — |
| 2007 | 57° | 39° | 48° | — | — |
| 2006 | 60° | 36° | 48° | — | — |
| 2005 | 84° | 46° | 65° | — | — |
| 2004 | 65° | 46° | 55° | — | — |
| 2003 | 64° | 46° | 55° | — | — |
| 2002 | — | 49° | — | — | — |
| 2001 | 55° | 42° | 49° | — | — |
| 2000 | 75° | 44° | 60° | — | — |
| 1999 | 72° | 49° | 60° | — | — |
| 1998coldest | 49° | 31° | 40° | — | — |
| 1994 | 75° | 38° | 56° | — | — |
| 1993 | 70° | 34° | 52° | — | — |
| 1992 | 64° | 30° | 47° | — | — |
| 1991 | 74° | 39° | 56° | — | — |
| 1990 | 56° | 26° | 41° | — | — |
| 1989 | 67° | 41° | 54° | — | — |
| 1988 | 62° | 49° | 55° | 2.59" | — |
| 1987 | 71° | 40° | 55° | — | — |
| 1986 | 74° | 37° | 55° | — | — |
| 1985 | 82° | 47° | 64° | — | — |
| 1984 | 60° | 38° | 49° | — | — |
| 1983 | 60° | 37° | 49° | — | — |
| 1982 | 55° | 43° | 49° | — | — |
| 1981 | 68° | 52° | 60° | — | — |
| 1980 | 81° | 45° | 63° | — | — |
| 1979 | 70° | 50° | 60° | 0.69" | — |
| 1978 | 68° | 35° | 52° | — | — |
| 1977 | 67° | 51° | 59° | — | — |
| 1976 | 70° | 39° | 54° | — | — |
| 1975 | 70° | 39° | 54° | — | — |
| 1974 | 76° | 43° | 59° | — | — |
| 1973 | 72° | 44° | 58° | — | — |
| 1972 | 79° | 44° | 61° | — | — |
| 1971 | 62° | 38° | 50° | — | — |
52 years of data from POMONA/FAIRPLEX