Weather on December 31
Rialto, CA
55 Years of Data
Avg High
62°F
Avg Low
43°F
Warmest
1997
66°F avg
Coldest
2014
39°F avg
About This Date
December 31st in Rialto, CA typically brings mild winter weather, with average highs around 62°F and lows near 43°F. Over 47 years of records, the warmest December 31st was in 1997 (66°F average), while the coldest was 2014 (39°F) — a 27°F range across recorded history. Rain or other precipitation has occurred on about 11% of December 31st dates historically.
Planning for December 31st in Rialto, CA? Great weather for outdoor activities.
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 64° | 54° | 59° | — | — |
| 2016 | 50° | 41° | 46° | — | — |
| 2015 | 55° | 42° | 49° | — | — |
| 2014coldest | 45° | 34° | 39° | — | — |
| 2013 | 73° | 53° | 63° | — | — |
| 2012 | 55° | 36° | 45° | — | — |
| 2011 | 77° | 53° | 65° | — | — |
| 2010 | 49° | 35° | 42° | — | — |
| 2009 | 63° | 48° | 55° | — | — |
| 2008 | 71° | 50° | 61° | — | — |
| 2007 | 61° | 50° | 55° | — | — |
| 2006 | 60° | 41° | 51° | — | — |
| 2005 | 52° | 46° | 49° | — | — |
| 2004 | 47° | 43° | 45° | — | — |
| 2003 | 65° | 41° | 53° | — | — |
| 2002 | 57° | 41° | 49° | — | — |
| 2001 | 55° | 46° | 51° | — | — |
| 2000 | 77° | 53° | 65° | — | — |
| 1999 | 49° | 42° | 45° | — | — |
| 1998 | 73° | 47° | 60° | — | — |
| 1997warmest | 77° | 56° | 66° | — | — |
| 1996 | 65° | 50° | 57° | — | — |
| 1995 | 72° | 50° | 61° | — | — |
| 1994 | 58° | 38° | 48° | — | — |
| 1993 | 72° | 43° | 57° | — | — |
| 1992 | 60° | 42° | 51° | — | — |
| 1991 | 54° | 43° | 48° | — | — |
| 1990 | 55° | 41° | 48° | — | — |
| 1989 | 72° | 39° | 55° | — | — |
| 1988 | 53° | 31° | 42° | 0.13" | — |
| 1987 | 56° | 30° | 43° | — | — |
| 1986 | 66° | 41° | 54° | — | — |
| 1985 | 63° | 46° | 54° | — | — |
| 1984 | 72° | 38° | 55° | — | — |
| 1983 | 76° | 49° | 62° | — | — |
| 1982 | 64° | 37° | 51° | — | — |
| 1981 | 57° | 51° | 54° | 0.13" | — |
| 1980 | 83° | 46° | 64° | — | — |
| 1979 | 74° | 46° | 60° | — | — |
| 1978 | 65° | 34° | 49° | — | — |
| 1977 | 60° | 49° | 54° | 0.03" | — |
| 1976 | 59° | 47° | 53° | 0.28" | — |
| 1975 | 60° | 46° | 53° | — | — |
| 1974 | 54° | 42° | 48° | 0.05" | — |
| 1973 | 67° | 38° | 52° | — | — |
| 1972 | 60° | 28° | 44° | — | — |
| 1971 | 59° | 38° | 48° | — | — |
47 years of data from FONTANA 5 N