All-time weather records — Waukesha, WI

Record high
109.0°F
July 14, 1936
Record low
-27.9°F
January 13, 2003
Wettest day
6.00 in
August 10, 2025

Climate change signal in Waukesha

2.7%

of Waukesha's all-time daily heat records were set in the last decade (10 of 366 records since 2015).

0.3%

of all-time daily cold records were set in the last decade (1 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 #
1890s
11
22
1900s
6
26
1910s
33
59
1920s
22
59
1930s
66
37
1940s
35
41
1950s
36
31
1960s
22
16
1970s
18
13
1980s
29
26
1990s
34
8
2000s
26
23
2010s
18
4
2020s
10
1

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 1894, the latest in 2026. Period of observation: 1893-2026.

Records by month

Month Hottest day Coldest day Wettest day
January 62.1°F — Jan 26, 1944 -27.9°F — Jan 13, 2003 2.66 in — Jan 24, 1938
February 71.1°F — Feb 28, 2024 -27.9°F — Feb 3, 1996 1.85 in — Feb 23, 1922
March 82.0°F — Mar 21, 2012 -14.1°F — Mar 1, 1962 2.10 in — Mar 4, 1976
April 91.0°F — Apr 22, 1980 7.0°F — Apr 7, 1982 3.37 in — Apr 21, 1973
May 100.9°F — May 31, 1934 25.0°F — May 1, 1943 3.50 in — May 13, 2014
June 100.9°F — Jun 1, 1934 27.0°F — Jun 14, 2012 4.05 in — Jun 22, 1940
July 109.0°F — Jul 14, 1936 41.0°F — Jul 31, 1918 5.09 in — Jul 18, 1952
August 102.0°F — Aug 6, 1918 35.1°F — Aug 28, 1915 6.00 in — Aug 10, 2025
September 100.9°F — Sep 1, 1953 25.0°F — Sep 28, 1942 5.61 in — Sep 12, 2022
October 88.0°F — Oct 1, 1971 7.0°F — Oct 30, 1925 2.44 in — Oct 17, 1905
November 78.1°F — Nov 1, 1944 -9.0°F — Nov 24, 1950 2.90 in — Nov 5, 2022
December 68.0°F — Dec 6, 2001 -27.9°F — Dec 19, 1945 1.89 in — Dec 26, 1942

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