Weather on December 23
Ontario, CA
55 Years of Data
Avg High
65°F
Avg Low
43°F
Warmest
2014
67°F avg
Coldest
1974
43°F avg
About This Date
December 23rd in Ontario, CA typically brings mild winter weather, with average highs around 65°F and lows near 43°F. Over 41 years of records, the warmest December 23rd was in 2014 (67°F average), while the coldest was 1974 (43°F) — a 24°F range across recorded history. Rain or other precipitation has occurred on about 15% of December 23rd dates historically, with the wettest December 23rd recording 5.08" of rain. The last decade has been 2.3°F warmer on this date compared to 20-30 years ago.
The last decade has been 2.3°F warmer on this date compared to 20-30 years ago.
Planning for December 23rd in Ontario, CA? Great weather for outdoor activities.
Warming Trend
1.3°F per decade on this date
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 63° | 52° | 57° | 0.05" | — |
| 2024 | 72° | 47° | 59° | — | — |
| 2023 | 63° | 49° | 56° | — | — |
| 2022 | 69° | 41° | 55° | — | — |
| 2021 | 57° | 50° | 54° | 5.08" | — |
| 2020 | 74° | 42° | 58° | — | — |
| 2019 | 62° | 50° | 56° | 1.78" | — |
| 2018 | 69° | 43° | 56° | — | — |
| 2017 | 67° | 44° | 55° | — | — |
| 2016 | 59° | 48° | 54° | 1.7" | — |
| 2015 | 64° | 49° | 56° | — | — |
| 2014warmest | 81° | 53° | 67° | — | — |
| 2013 | 74° | 43° | 58° | — | — |
| 2012 | 61° | 50° | 55° | — | — |
| 2011 | 68° | 40° | 54° | — | — |
| 2010 | 60° | 48° | 54° | — | — |
| 2009 | 63° | 35° | 49° | — | — |
| 2008 | 55° | 41° | 48° | — | — |
| 2007 | 76° | 38° | 57° | — | — |
| 2006 | 71° | 42° | 57° | — | — |
| 2005 | 79° | 50° | 64° | — | — |
| 2004 | 61° | 41° | 51° | — | — |
| 2003 | 65° | 47° | 56° | — | — |
| 2002 | 59° | 39° | 49° | — | — |
| 2001 | 59° | 40° | 49° | — | — |
| 2000 | 70° | 40° | 55° | — | — |
| 1999 | 75° | 52° | 63° | — | — |
| 1998 | 57° | 28° | 43° | — | — |
| 1983 | 59° | 45° | 52° | — | — |
| 1982 | 60° | 44° | 52° | 1.52" | — |
| 1981 | 63° | 31° | 47° | — | — |
| 1980 | 79° | 43° | 61° | — | — |
| 1979 | 58° | 35° | 46° | — | — |
| 1978 | 66° | 38° | 52° | — | — |
| 1977 | 60° | 49° | 54° | 0.08" | — |
| 1976 | 63° | 40° | 51° | — | — |
| 1975 | 63° | 39° | 51° | — | — |
| 1974coldest | 52° | 35° | 43° | — | — |
| 1973 | 59° | 36° | 47° | — | — |
| 1972 | 70° | 45° | 57° | — | — |
| 1971 | 60° | 43° | 51° | — | — |
41 years of data from ONTARIO INTL AP