All-time weather records — Vernon Hills, IL

Record high
102.9°F
July 6, 2012
Record low
-26.0°F
January 31, 2019
Wettest day
4.19 in
August 22, 2002

Climate change signal in Vernon Hills

33.6%

of Vernon Hills's all-time daily heat records were set in the last decade (123 of 366 records since 2015).

33.1%

of all-time daily cold records were set in the last decade (121 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
1
·
2000s
166
147
2010s
142
179
2020s
57
40

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 1999, the latest in 2024. Period of observation: 1999-2024.

Records by month

Month Hottest day Coldest day Wettest day
January 63.0°F — Jan 8, 2008 -26.0°F — Jan 31, 2019 1.43 in — Jan 17, 2017
February 75.0°F — Feb 28, 2024 -26.0°F — Feb 1, 2019 1.68 in — Feb 25, 2007
March 84.0°F — Mar 22, 2012 -11.0°F — Mar 1, 2015 2.18 in — Mar 21, 2011
April 89.1°F — Apr 19, 2002 15.1°F — Apr 8, 2018 4.12 in — Apr 18, 2013
May 93.9°F — May 28, 2018 25.0°F — May 9, 2020 3.30 in — May 13, 2010
June 98.1°F — Jun 29, 2012 35.1°F — Jun 1, 2003 3.21 in — Jun 11, 2014
July 102.9°F — Jul 6, 2012 6.1°F — Jul 4, 2000 3.21 in — Jul 24, 2010
August 97.0°F — Aug 22, 2003 45.0°F — Aug 15, 2004 4.19 in — Aug 22, 2002
September 93.9°F — Sep 1, 2012 34.0°F — Sep 24, 2012 3.53 in — Sep 12, 2022
October 87.1°F — Oct 7, 2007 21.9°F — Oct 31, 2020 2.36 in — Oct 23, 2001
November 75.0°F — Nov 2, 2016 3.9°F — Nov 21, 2014 1.46 in — Nov 3, 2016
December 68.0°F — Dec 4, 2012 -11.9°F — Dec 23, 2022 1.80 in — Dec 29, 2015

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