Weather on December 1
Rancho Cucamonga, CA
55 Years of Data
Avg High
69°F
Avg Low
44°F
Warmest
2021
69°F avg
Coldest
1982
45°F avg
About This Date
December 1st in Rancho Cucamonga, CA typically brings mild winter weather, with average highs around 69°F and lows near 44°F — a 25°F daily swing. Over 41 years of records, the warmest December 1st was in 2021 (69°F average), while the coldest was 1982 (45°F) — a 24°F range across recorded history. Rain or other precipitation has occurred on about 7% of December 1st dates historically, with the wettest December 1st recording 0.76" of rain. The last decade has been 5.7°F warmer on this date compared to 20-30 years ago.
The last decade has been 5.7°F warmer on this date compared to 20-30 years ago.
Planning for December 1st in Rancho Cucamonga, CA? Great weather for outdoor activities.
Warming Trend
0.8°F per decade on this date
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 73° | 48° | 61° | — | — |
| 2024 | 77° | 51° | 64° | — | — |
| 2023 | 65° | 47° | 56° | — | — |
| 2022 | 57° | 51° | 54° | — | — |
| 2021warmest | 87° | 52° | 69° | — | — |
| 2020 | 80° | 43° | 61° | — | — |
| 2019 | 64° | 46° | 55° | — | — |
| 2018 | 62° | 45° | 53° | — | — |
| 2017 | 78° | 50° | 64° | — | — |
| 2016 | 63° | 45° | 54° | — | — |
| 2015 | 71° | 36° | 53° | — | — |
| 2014 | 68° | 52° | 60° | — | — |
| 2013 | 79° | 48° | 63° | — | — |
| 2012 | 64° | 58° | 61° | — | — |
| 2011 | 63° | 50° | 56° | — | — |
| 2010 | 74° | 34° | 54° | — | — |
| 2009 | 70° | 44° | 57° | — | — |
| 2008 | 83° | 51° | 67° | — | — |
| 2007 | 55° | 45° | 50° | — | — |
| 2006 | 75° | 38° | 56° | — | — |
| 2005 | 71° | 44° | 58° | — | — |
| 2004 | 61° | 32° | 46° | — | — |
| 2003 | 71° | 41° | 56° | — | — |
| 2002 | 66° | 45° | 55° | — | — |
| 2001 | 64° | 40° | 52° | — | — |
| 2000 | 68° | 45° | 56° | — | — |
| 1999 | 61° | 44° | 52° | — | — |
| 1998 | 60° | 44° | 52° | 0.13" | — |
| 1983 | 64° | 44° | 54° | — | — |
| 1982coldest | 58° | 32° | 45° | — | — |
| 1981 | 70° | 44° | 57° | — | — |
| 1980 | 63° | 45° | 54° | — | — |
| 1979 | 78° | 50° | 64° | — | — |
| 1978 | 62° | 43° | 52° | 0.3" | — |
| 1977 | 77° | 50° | 64° | — | — |
| 1976 | 78° | 46° | 62° | — | — |
| 1975 | 71° | 35° | 53° | — | — |
| 1974 | 66° | 41° | 54° | — | — |
| 1973 | 57° | 40° | 48° | 0.76" | — |
| 1972 | 78° | 45° | 61° | — | — |
| 1971 | 65° | 40° | 52° | — | — |
41 years of data from ONTARIO INTL AP