Weather on December 20
Pomona, CA
55 Years of Data
Avg High
67°F
Avg Low
42°F
Warmest
1980
65°F avg
Coldest
1998
42°F avg
About This Date
December 20th in Pomona, CA typically brings mild winter weather, with average highs around 67°F and lows near 42°F — a 25°F daily swing. Over 52 years of records, the warmest December 20th was in 1980 (65°F average), while the coldest was 1998 (42°F) — a 23°F range across recorded history. Rain or other precipitation has occurred on about 6% of December 20th dates historically, with the wettest December 20th recording 3.99" of rain. The last decade has been 1.4°F warmer on this date compared to 20-30 years ago.
The last decade has been 1.4°F warmer on this date compared to 20-30 years ago.
Planning for December 20th in Pomona, CA? Great weather for outdoor activities.
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 65° | 48° | 56° | — | — |
| 2024 | 76° | 49° | 62° | — | — |
| 2023 | 64° | 49° | 56° | — | — |
| 2022 | 65° | 42° | 53° | — | — |
| 2021 | 68° | 39° | 54° | — | — |
| 2020 | 79° | 45° | 62° | — | — |
| 2019 | 71° | 43° | 57° | — | — |
| 2018 | 79° | 50° | 64° | — | — |
| 2017 | 58° | 42° | 50° | — | — |
| 2016 | 74° | 39° | 56° | — | — |
| 2015 | 59° | 41° | 50° | — | — |
| 2014 | 58° | 42° | 50° | — | — |
| 2013 | 60° | 37° | 49° | — | — |
| 2012 | 64° | 32° | 48° | — | — |
| 2011 | 63° | 41° | 52° | — | — |
| 2010 | 58° | 52° | 55° | 3.99" | — |
| 2009 | 71° | 47° | 59° | — | — |
| 2008 | 59° | 35° | 47° | 0.03" | — |
| 2007 | 56° | 49° | 52° | 0.48" | — |
| 2006 | 57° | 34° | 45° | — | — |
| 2005 | 75° | 47° | 61° | — | — |
| 2004 | 73° | 43° | 58° | — | — |
| 2003 | 64° | 46° | 55° | — | — |
| 2002 | 58° | 45° | 51° | — | — |
| 2001 | 72° | 37° | 54° | — | — |
| 2000 | 74° | 46° | 60° | — | — |
| 1999 | 77° | 52° | 64° | — | — |
| 1998coldest | 51° | 34° | 42° | — | — |
| 1994 | 78° | 39° | 59° | — | — |
| 1993 | 69° | 35° | 52° | — | — |
| 1992 | 61° | 29° | 45° | — | — |
| 1991 | 70° | 36° | 53° | — | — |
| 1990 | 54° | 35° | 44° | — | — |
| 1989 | 68° | 41° | 55° | — | — |
| 1988 | 58° | 40° | 49° | — | — |
| 1987 | 69° | 36° | 52° | — | — |
| 1986 | 69° | 43° | 56° | — | — |
| 1985 | 84° | 47° | 65° | — | — |
| 1984 | 58° | 34° | 46° | — | — |
| 1983 | 63° | 48° | 55° | — | — |
| 1982 | 76° | 44° | 60° | — | — |
| 1981 | 74° | 46° | 60° | — | — |
| 1980warmest | 81° | 50° | 65° | — | — |
| 1979 | 70° | 41° | 55° | — | — |
| 1978 | 61° | 34° | 47° | — | — |
| 1977 | 65° | 44° | 54° | — | — |
| 1976 | 68° | 41° | 55° | — | — |
| 1975 | 62° | 36° | 49° | — | — |
| 1974 | 70° | 41° | 55° | — | — |
| 1973 | 75° | 43° | 59° | — | — |
| 1972 | 68° | 43° | 55° | — | — |
| 1971 | 64° | 37° | 51° | — | — |
52 years of data from POMONA/FAIRPLEX