All-time weather records — Joliet, IL

Record high
104.0°F
June 26, 1988
Record low
-26.0°F
January 20, 1985
Wettest day
13.60 in
July 18, 1996

Climate change signal in Joliet

18%

of Joliet's all-time daily heat records were set in the last decade (66 of 366 records since 2015).

14.5%

of all-time daily cold records were set in the last decade (53 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
·
·
1960s
·
·
1970s
35
70
1980s
92
121
1990s
65
61
2000s
74
34
2010s
61
53
2020s
39
27

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 1975, the latest in 2026. Period of observation: 1943-2026.

Records by month

Month Hottest day Coldest day Wettest day
January 64.9°F — Jan 5, 1997 -26.0°F — Jan 20, 1985 2.52 in — Jan 9, 2026
February 73.0°F — Feb 26, 2000 -20.0°F — Feb 5, 1979 2.75 in — Feb 21, 1997
March 86.0°F — Mar 30, 1986 -7.1°F — Mar 4, 2002 2.32 in — Mar 25, 1954
April 91.9°F — Apr 26, 1986 10.9°F — Apr 7, 1982 4.92 in — Apr 5, 1947
May 95.0°F — May 28, 2012 18.0°F — May 4, 2023 3.70 in — May 26, 2011
June 104.0°F — Jun 26, 1988 35.1°F — Jun 13, 1985 5.13 in — Jun 13, 1981
July 102.9°F — Jul 14, 1995 46.9°F — Jul 1, 2024 13.60 in — Jul 18, 1996
August 102.0°F — Aug 2, 1988 39.0°F — Aug 29, 1986 4.00 in — Aug 15, 1958
September 97.0°F — Sep 9, 1978 32.0°F — Sep 23, 1983 4.10 in — Sep 28, 2019
October 88.0°F — Oct 1, 2025 17.1°F — Oct 29, 1976 3.75 in — Oct 11, 1954
November 78.1°F — Nov 6, 1978 -2.0°F — Nov 26, 1977 2.54 in — Nov 28, 1990
December 70.0°F — Dec 3, 1982 -20.0°F — Dec 24, 1983 3.34 in — Dec 3, 1982

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