All-time weather records — Geneseo, IL

Record high
107.1°F
July 24, 1901
Record low
-25.1°F
January 31, 2019
Wettest day
6.57 in
August 25, 1898

Climate change signal in Geneseo

13.4%

of Geneseo's all-time daily heat records were set in the last decade (49 of 366 records since 2015).

5.7%

of all-time daily cold records were set in the last decade (21 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 #
1890s
5
21
1900s
26
47
1920s
·
·
1930s
·
·
1940s
34
49
1950s
6
14
1960s
38
67
1970s
42
59
1980s
47
38
1990s
35
27
2000s
42
17
2010s
62
20
2020s
29
7

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 1895, the latest in 2026. Period of observation: 1895-2026.

Records by month

Month Hottest day Coldest day Wettest day
January 66.0°F — Jan 27, 1944 -25.1°F — Jan 31, 2019 3.05 in — Jan 12, 1960
February 75.9°F — Feb 27, 2024 -25.1°F — Feb 13, 1905 1.86 in — Feb 21, 1985
March 89.1°F — Mar 28, 1945 -13.0°F — Mar 1, 1962 2.27 in — Mar 24, 2009
April 91.9°F — Apr 25, 1986 12.0°F — Apr 7, 1982 3.01 in — Apr 21, 1973
May 99.0°F — May 27, 2018 26.1°F — May 10, 1966 4.62 in — May 13, 2010
June 100.9°F — Jun 19, 1971 37.0°F — Jun 5, 1945 6.00 in — Jun 24, 1898
July 107.1°F — Jul 24, 1901 44.1°F — Jul 22, 1947 5.00 in — Jul 30, 1904
August 102.9°F — Aug 17, 1988 39.9°F — Aug 28, 1986 6.57 in — Aug 25, 1898
September 99.0°F — Sep 8, 1971 -6.0°F — Sep 20, 1947 6.00 in — Sep 13, 2008
October 91.9°F — Oct 3, 1997 19.0°F — Oct 26, 1942 4.75 in — Oct 17, 1998
November 79.0°F — Nov 1, 2000 -7.1°F — Nov 26, 1977 3.31 in — Nov 17, 1928
December 70.0°F — Dec 3, 2012 -20.0°F — Dec 24, 1983 2.56 in — Dec 2, 1982

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