Weather on December 4
Rancho Cucamonga, CA
55 Years of Data
Avg High
67°F
Avg Low
44°F
Warmest
1979
66°F avg
Coldest
1971
46°F avg
About This Date
December 4th in Rancho Cucamonga, CA typically brings mild winter weather, with average highs around 67°F and lows near 44°F. Over 41 years of records, the warmest December 4th was in 1979 (66°F average), while the coldest was 1971 (46°F) — a 20°F range across recorded history. Rain or other precipitation has occurred on about 17% of December 4th dates historically, with the wettest December 4th recording 6.22" 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 4th 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 | 68° | 48° | 58° | — | — |
| 2024 | 69° | 46° | 58° | — | — |
| 2023 | 78° | 45° | 61° | — | — |
| 2022 | 63° | 46° | 54° | — | — |
| 2021 | 63° | 45° | 54° | — | — |
| 2020 | 73° | 38° | 55° | — | — |
| 2019 | 61° | 53° | 57° | 2.41" | — |
| 2018 | 69° | 43° | 56° | — | — |
| 2017 | 71° | 46° | 59° | — | — |
| 2016 | 74° | 41° | 57° | — | — |
| 2015 | 64° | 41° | 53° | — | — |
| 2014 | 68° | 58° | 63° | 0.23" | — |
| 2013 | 61° | 46° | 53° | — | — |
| 2012 | 71° | 53° | 62° | — | — |
| 2011 | 60° | 34° | 47° | — | — |
| 2010 | 63° | 43° | 53° | — | — |
| 2009 | 70° | 43° | 56° | — | — |
| 2008 | 66° | 52° | 59° | — | — |
| 2007 | 81° | 42° | 61° | — | — |
| 2006 | 77° | 37° | 57° | — | — |
| 2005 | 67° | 41° | 54° | — | — |
| 2004 | 57° | 35° | 46° | 0.05" | — |
| 2003 | 77° | 43° | 60° | — | — |
| 2002 | 71° | 45° | 58° | — | — |
| 2001 | 60° | 41° | 51° | — | — |
| 2000 | 78° | 45° | 61° | — | — |
| 1999 | 69° | 42° | 56° | — | — |
| 1998 | 57° | 44° | 51° | 0.08" | — |
| 1983 | 58° | 36° | 47° | — | — |
| 1982 | 75° | 49° | 62° | — | — |
| 1981 | 75° | 44° | 60° | — | — |
| 1980 | 56° | 49° | 52° | 1.75" | — |
| 1979warmest | 85° | 47° | 66° | — | — |
| 1978 | 65° | 38° | 51° | — | — |
| 1977 | 75° | 47° | 61° | — | — |
| 1976 | 67° | 40° | 53° | — | — |
| 1975 | 61° | 39° | 50° | — | — |
| 1974 | 55° | 49° | 52° | 6.22" | — |
| 1973 | 64° | 37° | 51° | — | — |
| 1972 | 53° | 46° | 50° | 4.11" | — |
| 1971coldest | 58° | 34° | 46° | — | — |
41 years of data from ONTARIO INTL AP