All-time weather records — South Jacksonville, IL

Record high
104.0°F
June 29, 2012
Record low
-13.0°F
January 30, 2019
Wettest day
4.73 in
September 21, 2009

Climate change signal in South Jacksonville

45.1%

of South Jacksonville's all-time daily heat records were set in the last decade (165 of 366 records since 2015).

52.2%

of all-time daily cold records were set in the last decade (191 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
·
1
1950s
·
·
2000s
94
64
2010s
193
205
2020s
79
96

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 2006, the latest in 2026. Period of observation: 1948-2026.

Records by month

Month Hottest day Coldest day Wettest day
January 70.0°F — Jan 8, 2008 -13.0°F — Jan 30, 2019 3.40 in — Jan 8, 2008
February 80.1°F — Feb 28, 2024 -8.0°F — Feb 7, 2014 1.94 in — Feb 21, 2018
March 84.0°F — Mar 15, 2012 -4.0°F — Mar 3, 2014 2.27 in — Mar 13, 2006
April 91.9°F — Apr 3, 2012 16.0°F — Apr 2, 2018 3.52 in — Apr 30, 2017
May 96.1°F — May 28, 2018 32.0°F — May 4, 2011 2.83 in — May 1, 2019
June 104.0°F — Jun 29, 2012 46.9°F — Jun 1, 2012 4.35 in — Jun 18, 2011
July 104.0°F — Jul 6, 2012 51.1°F — Jul 1, 2024 4.16 in — Jul 22, 2013
August 104.0°F — Aug 16, 2007 48.0°F — Aug 26, 2025 2.16 in — Aug 26, 2004
September 102.0°F — Sep 2, 2011 37.9°F — Sep 23, 2012 4.73 in — Sep 21, 2009
October 93.9°F — Oct 4, 2006 23.0°F — Oct 29, 2017 3.60 in — Oct 24, 2021
November 82.0°F — Nov 2, 2016 0.0°F — Nov 2, 1948 2.78 in — Nov 18, 2003
December 72.0°F — Dec 4, 2012 -9.9°F — Dec 23, 2022 2.38 in — Dec 27, 2015

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