Weather on December 20
Fontana, CA
55 Years of Data
About This Date
December 20th in Fontana, CA typically brings mild winter weather, with average highs around 67°F and lows near 42°F — a 25°F daily swing. Over 55 years of records, the warmest December 20th was in 1972 (66°F average), while the coldest was 1978 (46°F) — a 20°F range across recorded history. Rain or other precipitation has occurred on about 15% of December 20th dates historically, with the wettest December 20th recording 1.75" of rain. The last decade has been 3.0°F warmer on this date compared to 20-30 years ago.
The last decade has been 3.0°F warmer on this date compared to 20-30 years ago.
Planning for December 20th in Fontana, CA? Great weather for outdoor activities.
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 67° | 45° | 56° | — | — |
| 2024 | 78° | 51° | 65° | — | — |
| 2023 | 68° | 55° | 62° | 0.91" | — |
| 2022 | 66° | 39° | 53° | — | — |
| 2021 | 69° | 37° | 53° | — | — |
| 2020 | 82° | 39° | 61° | — | — |
| 2019 | 76° | 42° | 59° | — | — |
| 2018 | 79° | 48° | 63° | — | — |
| 2017 | 62° | 43° | 52° | — | — |
| 2016 | 75° | 37° | 56° | — | — |
| 2015 | 59° | 44° | 52° | — | — |
| 2014 | 59° | 46° | 53° | — | — |
| 2013 | 61° | 39° | 50° | — | — |
| 2012 | 65° | 33° | 49° | — | — |
| 2011 | 64° | 40° | 52° | — | — |
| 2010 | 59° | 52° | 55° | 0.74" | — |
| 2009 | 70° | 46° | 58° | — | — |
| 2008 | 59° | 35° | 47° | — | — |
| 2007 | 58° | 48° | 53° | 0.94" | — |
| 2006 | 59° | 36° | 47° | — | — |
| 2005 | 77° | 47° | 62° | — | — |
| 2004 | 71° | 43° | 57° | — | — |
| 2003 | 64° | 47° | 55° | — | — |
| 2002 | 56° | 44° | 50° | 1.75" | — |
| 2001 | 56° | 42° | 49° | 0.36" | — |
| 2000 | 73° | 40° | 56° | — | — |
| 1999 | 80° | 51° | 66° | — | — |
| 1998 | 54° | 39° | 46° | 0.03" | — |
| 1997 | 72° | 37° | 54° | — | — |
| 1996 | 76° | 35° | 55° | — | — |
| 1995 | 65° | 43° | 54° | — | — |
| 1994 | 83° | 40° | 61° | — | — |
| 1993 | 63° | 40° | 51° | — | — |
| 1992 | 62° | 30° | 46° | — | — |
| 1991 | 67° | 53° | 60° | — | — |
| 1990 | 54° | 40° | 47° | — | — |
| 1989 | 71° | 36° | 53° | — | — |
| 1988 | 60° | 40° | 50° | — | — |
| 1987 | 67° | 36° | 51° | — | — |
| 1986 | 66° | 46° | 56° | — | — |
| 1985 | 83° | 40° | 61° | — | — |
| 1984 | 58° | 41° | 49° | 1.19" | — |
| 1983 | 58° | 47° | 52° | — | — |
| 1982 | 75° | 38° | 56° | — | — |
| 1981 | 65° | 40° | 52° | — | — |
| 1980 | 77° | 42° | 60° | — | — |
| 1979 | 67° | 34° | 50° | — | — |
| 1978coldest | 60° | 32° | 46° | — | — |
| 1977 | 70° | 45° | 57° | — | — |
| 1976 | 74° | 39° | 56° | — | — |
| 1975 | 70° | 43° | 56° | 0.28" | — |
| 1974 | 65° | 46° | 55° | — | — |
| 1973 | 76° | 44° | 60° | — | — |
| 1972warmest | 78° | 54° | 66° | — | — |
| 1971 | 63° | 41° | 52° | — | — |
Fontana, CA Temperature Range by Month
Average monthly highs and lows. The shaded band shows the typical daily temperature range.
Fontana, CA Monthly Precipitation
Average rainfall per month, in inches.
Fontana, CA Daily Temperature Calendar
Average daily high temperature for every day of the year. Each cell is the climatological mean for that calendar day across 55 years of NOAA data.
Best Time to Visit Fontana, CA
Fontana, CA has no months that meet our "pleasant" threshold — every season has tradeoffs.