All-time weather records — Jerseyville, IL

Record high
111.9°F
July 14, 1954
Record low
-25.1°F
January 17, 1977
Wettest day
5.81 in
August 11, 1961

Climate change signal in Jerseyville

9.8%

of Jerseyville's all-time daily heat records were set in the last decade (36 of 366 records since 2015).

5.5%

of all-time daily cold records were set in the last decade (20 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
38
23
1950s
113
35
1960s
41
91
1970s
24
73
1980s
44
58
1990s
21
35
2000s
31
17
2010s
35
23
2020s
19
11

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 1940, the latest in 2026. Period of observation: 1940-2026.

Records by month

Month Hottest day Coldest day Wettest day
January 73.9°F — Jan 24, 1950 -25.1°F — Jan 17, 1977 2.90 in — Jan 11, 2020
February 82.0°F — Feb 28, 2024 -22.0°F — Feb 9, 1979 2.21 in — Feb 6, 2008
March 93.0°F — Mar 27, 2026 -11.0°F — Mar 5, 1960 2.82 in — Mar 12, 1977
April 91.9°F — Apr 28, 1951 17.1°F — Apr 16, 1994 4.04 in — Apr 30, 2017
May 96.1°F — May 26, 1953 28.0°F — May 4, 1976 4.53 in — May 26, 2008
June 104.0°F — Jun 26, 1954 37.0°F — Jun 1, 1972 3.57 in — Jun 12, 2002
July 111.9°F — Jul 14, 1954 37.9°F — Jul 20, 1944 5.44 in — Jul 27, 2025
August 105.1°F — Aug 3, 1964 37.9°F — Aug 29, 1986 5.81 in — Aug 11, 1961
September 102.0°F — Sep 1, 2013 24.1°F — Sep 28, 1942 3.78 in — Sep 9, 1989
October 93.0°F — Oct 2, 1953 17.1°F — Oct 21, 1952 5.58 in — Oct 2, 2014
November 84.0°F — Nov 1, 1950 -2.0°F — Nov 8, 1991 3.52 in — Nov 18, 2003
December 75.9°F — Dec 29, 2025 -18.9°F — Dec 22, 1989 5.12 in — Dec 3, 1982

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