Weather on December 16
Rialto, CA
55 Years of Data
Avg High
65°F
Avg Low
46°F
Warmest
1998
70°F avg
Coldest
1987
43°F avg
About This Date
December 16th in Rialto, CA typically brings mild winter weather, with average highs around 65°F and lows near 46°F. Over 47 years of records, the warmest December 16th was in 1998 (70°F average), while the coldest was 1987 (43°F) — a 27°F range across recorded history. Rain or other precipitation has occurred on about 6% of December 16th dates historically, with the wettest December 16th recording 1.12" of rain.
Planning for December 16th in Rialto, CA? Great weather for outdoor activities.
Cooling Trend
1.0°F per decade on this date
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 82° | 47° | 65° | — | — |
| 2016 | 56° | 42° | 49° | — | — |
| 2015 | 57° | 41° | 49° | — | — |
| 2014 | 53° | 47° | 50° | — | — |
| 2013 | 76° | 63° | 69° | — | — |
| 2012 | 48° | 44° | 46° | — | — |
| 2011 | 58° | 48° | 53° | — | — |
| 2010 | 50° | 45° | 47° | — | — |
| 2009 | 65° | 51° | 58° | — | — |
| 2008 | 47° | 41° | 44° | — | — |
| 2007 | 65° | 44° | 54° | — | — |
| 2006 | 51° | 37° | 44° | — | — |
| 2005 | 57° | 35° | 46° | — | — |
| 2004 | 66° | 56° | 61° | — | — |
| 2003 | 61° | 47° | 54° | — | — |
| 2002 | 54° | 47° | 50° | — | — |
| 2001 | 67° | 45° | 56° | — | — |
| 2000 | 71° | 56° | 63° | — | — |
| 1999 | 79° | 56° | 67° | — | — |
| 1998warmest | 77° | 63° | 70° | — | — |
| 1997 | 74° | 53° | 63° | — | — |
| 1996 | 65° | 51° | 58° | — | — |
| 1995 | 61° | 43° | 52° | — | — |
| 1994 | 66° | 48° | 57° | — | — |
| 1993 | 59° | 36° | 47° | — | — |
| 1992 | 55° | 39° | 47° | — | — |
| 1991 | 68° | 51° | 60° | — | — |
| 1990 | 57° | 40° | 48° | — | — |
| 1989 | 64° | 40° | 52° | — | — |
| 1988 | 51° | 43° | 47° | 1.12" | — |
| 1987coldest | 48° | 38° | 43° | 0.46" | — |
| 1986 | 67° | 47° | 57° | — | — |
| 1985 | 73° | 65° | 69° | — | — |
| 1984 | 57° | 43° | 50° | 0.66" | — |
| 1983 | 73° | 45° | 59° | — | — |
| 1982 | 73° | 37° | 55° | — | — |
| 1981 | 78° | 42° | 60° | — | — |
| 1980 | 86° | 49° | 67° | — | — |
| 1979 | 81° | 38° | 59° | — | — |
| 1978 | 73° | 37° | 55° | — | — |
| 1977 | 68° | 43° | 55° | — | — |
| 1976 | 79° | 49° | 64° | — | — |
| 1975 | 67° | 53° | 60° | — | — |
| 1974 | 80° | 50° | 65° | — | — |
| 1973 | 80° | 42° | 61° | — | — |
| 1972 | 72° | 37° | 54° | — | — |
| 1971 | 62° | 32° | 47° | — | — |
47 years of data from FONTANA 5 N