All-time weather records — South Chicago Heights, IL

Record high
102.9°F
August 2, 1988
Record low
-27.0°F
January 20, 1985
Wettest day
6.55 in
July 18, 1996

Climate change signal in South Chicago Heights

12.6%

of South Chicago Heights's all-time daily heat records were set in the last decade (46 of 366 records since 2015).

6%

of all-time daily cold records were set in the last decade (22 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 #
1950s
67
57
1960s
44
83
1970s
36
65
1980s
62
71
1990s
38
38
2000s
42
18
2010s
52
29
2020s
25
5

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 1952, the latest in 2026. Period of observation: 1952-2026.

Records by month

Month Hottest day Coldest day Wettest day
January 64.9°F — Jan 8, 2008 -27.0°F — Jan 20, 1985 3.48 in — Jan 8, 2008
February 71.1°F — Feb 26, 2000 -20.9°F — Feb 1, 2019 3.00 in — Feb 3, 2019
March 86.0°F — Mar 22, 2012 -6.0°F — Mar 4, 2002 1.98 in — Mar 7, 2026
April 89.1°F — Apr 23, 1980 9.0°F — Apr 7, 1982 3.88 in — Apr 17, 2006
May 97.0°F — May 28, 2018 25.0°F — May 10, 1966 6.43 in — May 22, 1982
June 102.0°F — Jun 26, 1988 36.0°F — Jun 11, 1972 4.27 in — Jun 22, 2018
July 102.0°F — Jul 14, 1995 45.0°F — Jul 5, 1972 6.55 in — Jul 18, 1996
August 102.9°F — Aug 2, 1988 39.9°F — Aug 30, 2003 4.95 in — Aug 16, 1968
September 99.0°F — Sep 1, 1953 28.9°F — Sep 23, 1995 4.70 in — Sep 28, 2019
October 91.0°F — Oct 6, 1963 17.1°F — Oct 29, 1952 5.93 in — Oct 10, 1954
November 77.0°F — Nov 2, 2016 0.0°F — Nov 28, 1955 3.40 in — Nov 28, 1990
December 70.0°F — Dec 3, 1982 -20.9°F — Dec 25, 1983 3.87 in — Dec 3, 1982

Click a month to see every daily record for that month in South Chicago Heights.