All-time weather records — Sullivan, WI

Record high
106.0°F
July 5, 2012
Record low
-29.9°F
January 31, 2019
Wettest day
4.93 in
May 12, 2014

Climate change signal in Sullivan

35.8%

of Sullivan's all-time daily heat records were set in the last decade (131 of 366 records since 2015).

32.2%

of all-time daily cold records were set in the last decade (118 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
81
53
2000s
104
140
2010s
95
109
2020s
86
64

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 1995, the latest in 2026. Period of observation: 1995-2026.

Records by month

Month Hottest day Coldest day Wettest day
January 60.1°F — Jan 5, 1997 -29.9°F — Jan 31, 2019 2.06 in — Jan 29, 2013
February 71.1°F — Feb 27, 2024 -29.0°F — Feb 4, 1996 1.64 in — Feb 27, 2023
March 81.0°F — Mar 27, 2007 -13.0°F — Mar 4, 2002 2.32 in — Mar 31, 1998
April 89.1°F — Apr 19, 2002 12.9°F — Apr 5, 2018 2.40 in — Apr 23, 1999
May 95.0°F — May 27, 2012 21.9°F — May 9, 2020 4.93 in — May 12, 2014
June 99.0°F — Jun 28, 2012 33.1°F — Jun 1, 2003 3.80 in — Jun 8, 2008
July 106.0°F — Jul 5, 2012 41.0°F — Jul 2, 2001 4.70 in — Jul 23, 2010
August 98.1°F — Aug 1, 2001 39.9°F — Aug 21, 2004 4.09 in — Aug 19, 2007
September 96.1°F — Sep 14, 1998 28.9°F — Sep 15, 2007 3.47 in — Sep 11, 2022
October 90.0°F — Oct 6, 1997 19.0°F — Oct 31, 2019 2.05 in — Oct 26, 2016
November 75.0°F — Nov 3, 2015 -2.0°F — Nov 29, 1995 3.41 in — Nov 6, 2005
December 66.9°F — Dec 6, 2001 -16.1°F — Dec 19, 2016 1.39 in — Dec 28, 2015

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