All-time weather records — South Milwaukee, WI

Record high
100.9°F
July 5, 2012
Record low
-22.0°F
January 31, 2019
Wettest day
9.03 in
September 12, 2022

Climate change signal in South Milwaukee

62.6%

of South Milwaukee's all-time daily heat records were set in the last decade (229 of 366 records since 2015).

46.4%

of all-time daily cold records were set in the last decade (170 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 #
2000s
51
89
2010s
194
201
2020s
121
76

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: 2006-2026.

Records by month

Month Hottest day Coldest day Wettest day
January 62.1°F — Jan 8, 2008 -22.0°F — Jan 31, 2019 1.37 in — Jan 30, 2013
February 73.9°F — Feb 28, 2024 -22.0°F — Feb 1, 2019 1.57 in — Feb 20, 2018
March 80.1°F — Mar 27, 2007 -5.1°F — Mar 4, 2019 1.73 in — Mar 16, 2026
April 84.0°F — Apr 11, 2011 18.0°F — Apr 7, 2018 2.80 in — Apr 3, 2026
May 90.0°F — May 15, 2007 30.0°F — May 9, 2020 2.96 in — May 18, 2020
June 98.1°F — Jun 22, 2022 41.0°F — Jun 2, 2015 5.06 in — Jun 8, 2008
July 100.9°F — Jul 5, 2012 52.0°F — Jul 5, 2008 6.65 in — Jul 23, 2010
August 99.0°F — Aug 24, 2023 46.0°F — Aug 31, 2009 6.05 in — Aug 10, 2025
September 95.0°F — Sep 11, 2013 37.9°F — Sep 15, 2007 9.03 in — Sep 12, 2022
October 89.1°F — Oct 5, 2025 25.0°F — Oct 31, 2020 2.71 in — Oct 2, 2019
November 78.1°F — Nov 11, 2022 8.1°F — Nov 12, 2019 1.56 in — Nov 27, 2015
December 66.9°F — Dec 16, 2021 -9.0°F — Dec 23, 2022 1.44 in — Dec 21, 2012

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