All-time weather records — Bannockburn, IL

Record high
108.0°F
November 26, 1999
Record low
-20.7°F
January 30, 2019
Wettest day
4.53 in
June 26, 2013

Climate change signal in Bannockburn

45.9%

of Bannockburn's all-time daily heat records were set in the last decade (168 of 366 records since 2015).

27.9%

of all-time daily cold records were set in the last decade (102 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
31
64
2000s
107
132
2010s
122
134
2020s
106
36

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 1996, the latest in 2026. Period of observation: 1996-2026.

Records by month

Month Hottest day Coldest day Wettest day
January 64.9°F — Jan 7, 2008 -20.7°F — Jan 30, 2019 1.50 in — Jan 29, 2013
February 75.0°F — Feb 27, 2024 -11.7°F — Feb 28, 2015 1.55 in — Feb 20, 2018
March 86.0°F — Mar 20, 2012 -3.8°F — Mar 3, 2014 1.57 in — Mar 28, 2020
April 88.0°F — Apr 15, 2002 19.9°F — Apr 9, 1997 2.00 in — Apr 20, 2000
May 97.0°F — May 27, 2018 28.9°F — May 3, 2004 2.59 in — May 17, 2020
June 99.0°F — Jun 14, 2022 37.0°F — Jun 1, 2003 4.53 in — Jun 26, 2013
July 104.0°F — Jul 6, 2012 50.0°F — Jul 2, 2001 3.38 in — Jul 23, 2011
August 100.0°F — Aug 24, 2023 46.9°F — Aug 31, 2009 2.13 in — Aug 4, 2014
September 96.1°F — Sep 10, 2013 -0.8°F — Sep 28, 2010 4.36 in — Sep 13, 2008
October 89.1°F — Oct 3, 2025 25.2°F — Oct 31, 2023 3.56 in — Oct 13, 2001
November 108.0°F — Nov 26, 1999 1.2°F — Nov 14, 2013 1.57 in — Nov 2, 2003
December 69.1°F — Dec 3, 2012 -8.0°F — Dec 22, 2000 1.43 in — Dec 1, 2006

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