Weather on December 1
Rialto, CA
55 Years of Data
Avg High
68°F
Avg Low
46°F
Warmest
2008
69°F avg
Coldest
1991
46°F avg
About This Date
December 1st in Rialto, CA typically brings mild winter weather, with average highs around 68°F and lows near 46°F. Over 47 years of records, the warmest December 1st was in 2008 (69°F average), while the coldest was 1991 (46°F) — a 23°F range across recorded history. Rain or other precipitation has occurred on about 6% of December 1st dates historically, with the wettest December 1st recording 0.53" of rain.
Planning for December 1st in Rialto, CA? Great weather for outdoor activities.
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 72° | 41° | 56° | — | — |
| 2016 | 61° | 45° | 53° | — | — |
| 2015 | 66° | 48° | 57° | — | — |
| 2014 | 67° | 52° | 59° | — | — |
| 2013 | 72° | 58° | 65° | — | — |
| 2012 | 56° | 55° | 55° | — | — |
| 2011 | 54° | 47° | 50° | — | — |
| 2010 | 65° | 48° | 56° | — | — |
| 2009 | 67° | 48° | 57° | — | — |
| 2008warmest | 83° | 56° | 69° | — | — |
| 2007 | 49° | 44° | 46° | — | — |
| 2006 | 68° | 50° | 59° | — | — |
| 2005 | 75° | 49° | 62° | — | — |
| 2004 | 62° | 41° | 52° | — | — |
| 2003 | 73° | 45° | 59° | — | — |
| 2002 | 71° | 46° | 59° | — | — |
| 2001 | 64° | 39° | 52° | — | — |
| 2000 | 67° | 56° | 61° | — | — |
| 1999 | 63° | 43° | 53° | — | — |
| 1998 | 66° | 44° | 55° | — | — |
| 1997 | 69° | 45° | 57° | — | — |
| 1996 | 69° | 39° | 54° | — | — |
| 1995 | 77° | 52° | 64° | — | — |
| 1994 | 71° | 47° | 59° | — | — |
| 1993 | 67° | 52° | 59° | — | — |
| 1992 | 72° | 47° | 59° | — | — |
| 1991coldest | 47° | 45° | 46° | — | — |
| 1990 | 71° | 54° | 62° | — | — |
| 1989 | 73° | 39° | 56° | — | — |
| 1988 | 74° | 42° | 58° | — | — |
| 1987 | 62° | 38° | 50° | — | — |
| 1986 | 77° | 38° | 57° | — | — |
| 1985 | 59° | 46° | 53° | — | — |
| 1984 | 68° | 46° | 57° | — | — |
| 1983 | 70° | 49° | 59° | — | — |
| 1982 | 60° | 42° | 51° | 0.03" | — |
| 1981 | 72° | 39° | 55° | — | — |
| 1980 | 66° | 47° | 56° | — | — |
| 1979 | 81° | 41° | 61° | — | — |
| 1978 | 61° | 41° | 51° | 0.53" | — |
| 1977 | 81° | 49° | 65° | — | — |
| 1976 | 81° | 45° | 63° | — | — |
| 1975 | 68° | 50° | 59° | — | — |
| 1974 | 72° | 42° | 57° | — | — |
| 1973 | 58° | 38° | 48° | 0.36" | — |
| 1972 | 86° | 40° | 63° | — | — |
| 1971 | 65° | 46° | 55° | — | — |
47 years of data from FONTANA 5 N