All-time weather records — Rialto, CA

Record high
117.0°F
July 22, 2006
Record low
21.9°F
December 23, 1990
Wettest day
3.16 in
January 4, 1995

Climate change signal in Rialto

0%

of Rialto's all-time daily heat records were set in the last decade (0 of 366 records since 2015).

0%

of all-time daily cold records were set in the last decade (0 of 366 records since 2015).

If records were spread evenly across the station's history, you'd expect roughly 5% per decade. Decade-by-decade, here's where each record-breaking day was set:

Decade Heat records set # Cold records set #
1940s
·
·
1950s
37
41
1960s
69
205
1970s
71
69
1980s
50
26
1990s
47
19
2000s
92
6

Records are the all-time daily extremes that are still standing — each daily record can only be held by one year. The station's earliest hot record was set in 1956, the latest in 2009. Period of observation: 1948-2009.

Records by month

Month Hottest day Coldest day Wettest day
January 97.0°F — Jan 31, 2003 24.1°F — Jan 13, 1963 3.16 in — Jan 4, 1995
February 91.9°F — Feb 7, 1963 27.0°F — Feb 17, 1956 2.34 in — Feb 24, 1969
March 98.1°F — Mar 12, 2007 28.9°F — Mar 1, 1962 2.03 in — Mar 17, 1982
April 104.0°F — Apr 6, 1989 33.1°F — Apr 2, 1956 1.39 in — Apr 20, 1983
May 108.0°F — May 29, 1984 37.9°F — May 8, 1965 0.71 in — May 9, 1977
June 111.9°F — Jun 16, 1961 44.1°F — Jun 2, 1967 0.91 in — Jun 5, 1993
July 117.0°F — Jul 22, 2006 48.9°F — Jul 1, 1965 0.33 in — Jul 29, 1968
August 111.9°F — Aug 29, 1998 48.9°F — Aug 22, 1968 1.18 in — Aug 17, 1977
September 113.0°F — Sep 2, 2007 42.1°F — Sep 20, 1970 1.84 in — Sep 11, 1976
October 108.0°F — Oct 1, 1980 32.0°F — Oct 28, 1970 1.96 in — Oct 20, 2004
November 98.1°F — Nov 7, 2006 26.1°F — Nov 17, 1958 2.48 in — Nov 23, 1965
December 93.0°F — Dec 4, 1958 21.9°F — Dec 23, 1990 2.32 in — Dec 6, 1997

Click a month to see every daily record for that month in Rialto.