All-time weather records — Big Rock, IL

Record high
120.9°F
August 14, 2003
Record low
-32.8°F
January 16, 2009
Wettest day
5.15 in
September 13, 2008

Climate change signal in Big Rock

43.2%

of Big Rock's all-time daily heat records were set in the last decade (158 of 366 records since 2015).

32.8%

of all-time daily cold records were set in the last decade (120 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
16
28
2000s
130
157
2010s
118
126
2020s
102
55

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 1998, the latest in 2026. Period of observation: 1998-2026.

Records by month

Month Hottest day Coldest day Wettest day
January 73.0°F — Jan 28, 2000 -32.8°F — Jan 16, 2009 1.12 in — Jan 29, 2013
February 73.9°F — Feb 27, 2024 -22.9°F — Feb 11, 2014 1.94 in — Feb 26, 2009
March 82.9°F — Mar 20, 2012 -11.9°F — Mar 4, 2002 1.62 in — Mar 30, 2017
April 90.0°F — Apr 18, 2002 14.2°F — Apr 7, 2018 2.53 in — Apr 22, 1999
May 97.0°F — May 27, 2012 10.2°F — May 20, 2015 2.35 in — May 30, 2004
June 98.1°F — Jun 28, 2012 0.1°F — Jun 10, 2007 2.86 in — Jun 15, 2015
July 102.0°F — Jul 7, 2012 44.1°F — Jul 2, 2001 2.79 in — Jul 12, 2023
August 120.9°F — Aug 14, 2003 39.9°F — Aug 31, 2009 3.69 in — Aug 8, 2007
September 95.0°F — Sep 13, 2005 29.1°F — Sep 24, 2012 5.15 in — Sep 13, 2008
October 91.0°F — Oct 3, 2025 8.1°F — Oct 15, 2004 5.14 in — Oct 14, 2017
November 77.0°F — Nov 1, 2016 0.1°F — Nov 22, 2015 1.77 in — Nov 4, 2003
December 72.0°F — Dec 29, 1998 -17.9°F — Dec 19, 2016 1.73 in — Dec 27, 2008

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