All-time weather records — Mequon, WI

Record high
104.0°F
July 6, 2012
Record low
-40.0°F
January 10, 1982
Wettest day
8.62 in
August 10, 2025

Climate change signal in Mequon

17.8%

of Mequon's all-time daily heat records were set in the last decade (65 of 366 records since 2015).

4.4%

of all-time daily cold records were set in the last decade (16 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
38
13
1950s
46
36
1960s
30
51
1970s
37
77
1980s
45
70
1990s
32
80
2000s
45
17
2010s
52
19
2020s
41
3

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 1944, the latest in 2026. Period of observation: 1944-2026.

Records by month

Month Hottest day Coldest day Wettest day
January 57.9°F — Jan 30, 2013 -40.0°F — Jan 10, 1982 1.58 in — Jan 20, 1988
February 72.0°F — Feb 28, 2024 -27.9°F — Feb 3, 1996 1.56 in — Feb 21, 1997
March 82.9°F — Mar 22, 2012 -20.0°F — Mar 1, 1962 2.18 in — Mar 31, 1998
April 89.1°F — Apr 23, 1980 7.0°F — Apr 8, 1982 2.64 in — Apr 15, 2026
May 93.0°F — May 28, 2018 19.9°F — May 10, 1966 3.55 in — May 18, 2000
June 99.0°F — Jun 22, 1988 23.0°F — Jun 5, 1990 5.25 in — Jun 21, 1997
July 104.0°F — Jul 6, 2012 36.0°F — Jul 22, 1993 7.05 in — Jul 18, 1964
August 102.0°F — Aug 2, 1988 33.1°F — Aug 22, 1992 8.62 in — Aug 10, 2025
September 99.0°F — Sep 1, 1953 21.9°F — Sep 30, 1993 4.07 in — Sep 11, 1986
October 89.1°F — Oct 6, 1963 1.0°F — Oct 28, 1987 3.09 in — Oct 3, 1954
November 77.0°F — Nov 1, 1950 -15.0°F — Nov 29, 1976 2.70 in — Nov 4, 2003
December 66.9°F — Dec 6, 2001 -25.1°F — Dec 24, 1983 3.20 in — Dec 19, 2000

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