All-time weather records — Oconomowoc, WI

Record high
102.9°F
July 6, 2012
Record low
-33.0°F
January 30, 1951
Wettest day
5.38 in
August 10, 1995

Climate change signal in Oconomowoc

15.6%

of Oconomowoc's all-time daily heat records were set in the last decade (57 of 366 records since 2015).

4.6%

of all-time daily cold records were set in the last decade (17 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
26
38
1940s
47
31
1950s
35
45
1960s
27
51
1970s
26
59
1980s
44
59
1990s
34
37
2000s
39
25
2010s
54
15
2020s
34
6

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

Records by month

Month Hottest day Coldest day Wettest day
January 59.0°F — Jan 5, 1997 -33.0°F — Jan 30, 1951 1.32 in — Jan 23, 2018
February 72.0°F — Feb 28, 2024 -29.0°F — Feb 3, 1996 1.41 in — Feb 21, 1997
March 82.9°F — Mar 22, 2012 -18.9°F — Mar 1, 1962 2.53 in — Mar 31, 1998
April 88.0°F — Apr 16, 2002 3.9°F — Apr 6, 1982 2.37 in — Apr 23, 1999
May 93.9°F — May 20, 1975 23.0°F — May 10, 1966 2.82 in — May 13, 2014
June 100.0°F — Jun 20, 1988 30.9°F — Jun 4, 1945 3.56 in — Jun 8, 2008
July 102.9°F — Jul 6, 2012 41.0°F — Jul 17, 1896 4.82 in — Jul 18, 1952
August 100.9°F — Aug 17, 1988 39.0°F — Aug 6, 1893 5.38 in — Aug 10, 1995
September 98.1°F — Sep 1, 1953 26.1°F — Sep 29, 1949 4.98 in — Sep 12, 2022
October 87.1°F — Oct 2, 1976 10.0°F — Oct 30, 1895 2.82 in — Oct 31, 1984
November 75.9°F — Nov 4, 2015 -14.1°F — Nov 30, 1947 2.38 in — Nov 6, 2005
December 66.9°F — Dec 6, 2001 -25.1°F — Dec 23, 1983 1.64 in — Dec 15, 1971

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