All-time weather records — Walnut Hill, IL

Record high
107.1°F
June 29, 2012
Record low
-14.1°F
January 7, 2014
Wettest day
5.09 in
September 26, 2012

Climate change signal in Walnut Hill

31.1%

of Walnut Hill's all-time daily heat records were set in the last decade (114 of 366 records since 2015).

36.3%

of all-time daily cold records were set in the last decade (133 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 #
1990s
49
17
2000s
126
138
2010s
131
131
2020s
60
80

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 1997, the latest in 2025. Period of observation: 1997-2025.

Records by month

Month Hottest day Coldest day Wettest day
January 70.0°F — Jan 30, 2002 -14.1°F — Jan 7, 2014 3.18 in — Jan 22, 1999
February 78.1°F — Feb 28, 2024 -11.0°F — Feb 17, 2021 2.29 in — Feb 6, 2008
March 82.9°F — Mar 22, 2012 1.0°F — Mar 4, 2002 3.90 in — Mar 19, 2008
April 88.0°F — Apr 16, 2024 21.9°F — Apr 2, 2021 4.27 in — Apr 5, 2025
May 91.9°F — May 17, 2001 33.1°F — May 9, 2020 3.00 in — May 8, 2008
June 107.1°F — Jun 29, 2012 39.0°F — Jun 1, 2003 3.80 in — Jun 17, 2000
July 107.1°F — Jul 6, 2012 6.1°F — Jul 12, 2014 5.00 in — Jul 16, 2024
August 102.9°F — Aug 16, 2007 44.1°F — Aug 12, 2004 4.13 in — Aug 17, 2014
September 99.0°F — Sep 7, 1998 34.0°F — Sep 25, 2001 5.09 in — Sep 26, 2012
October 93.9°F — Oct 2, 2019 21.0°F — Oct 31, 2023 3.20 in — Oct 9, 2009
November 82.0°F — Nov 1, 1999 7.0°F — Nov 13, 2019 2.35 in — Nov 22, 2020
December 73.0°F — Dec 4, 1998 -14.1°F — Dec 23, 2022 2.90 in — Dec 27, 2015

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