All-time weather records — Mendon, IL

Record high
111.9°F
July 14, 1954
Record low
-22.0°F
December 22, 1989
Wettest day
5.84 in
June 14, 1950

Climate change signal in Mendon

16.9%

of Mendon's all-time daily heat records were set in the last decade (62 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
12
11
1950s
73
86
1960s
50
70
1970s
23
52
1980s
47
59
1990s
20
35
2000s
40
18
2010s
58
24
2020s
43
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 1948, the latest in 2026. Period of observation: 1948-2026.

Records by month

Month Hottest day Coldest day Wettest day
January 73.0°F — Jan 24, 1950 -20.9°F — Jan 10, 1982 3.38 in — Jan 1, 1965
February 80.1°F — Feb 27, 2024 -18.0°F — Feb 3, 1996 1.91 in — Feb 20, 1997
March 89.1°F — Mar 26, 2026 -20.9°F — Mar 1, 1983 2.27 in — Mar 28, 1977
April 91.9°F — Apr 25, 1986 9.1°F — Apr 2, 2018 2.86 in — Apr 21, 1973
May 96.1°F — May 27, 2018 28.0°F — May 10, 1966 2.75 in — May 17, 1986
June 104.0°F — Jun 28, 2012 42.1°F — Jun 4, 1950 5.84 in — Jun 14, 1950
July 111.9°F — Jul 14, 1954 46.9°F — Jul 14, 1950 4.62 in — Jul 22, 1951
August 102.9°F — Aug 15, 2007 42.1°F — Aug 20, 1950 5.60 in — Aug 25, 2004
September 104.0°F — Sep 1, 2011 32.0°F — Sep 29, 1984 4.12 in — Sep 13, 1961
October 93.0°F — Oct 2, 1953 18.0°F — Oct 29, 1952 4.69 in — Oct 24, 2021
November 81.0°F — Nov 1, 1950 -11.0°F — Nov 30, 1964 3.47 in — Nov 18, 1985
December 75.0°F — Dec 15, 2021 -22.0°F — Dec 22, 1989 4.60 in — Dec 2, 1982

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