All-time weather records — Hartford, WI

Record high
105.1°F
July 31, 1999
Record low
-35.0°F
January 10, 1982
Wettest day
5.20 in
September 10, 1986

Climate change signal in Hartford

12.3%

of Hartford's all-time daily heat records were set in the last decade (45 of 366 records since 2015).

7.4%

of all-time daily cold records were set in the last decade (27 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
12
24
1900s
12
10
1940s
·
·
1950s
41
22
1960s
49
53
1970s
25
84
1980s
53
73
1990s
60
37
2000s
43
20
2010s
46
33
2020s
25
10

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 1897, the latest in 2026. Period of observation: 1893-2026.

Records by month

Month Hottest day Coldest day Wettest day
January 55.0°F — Jan 9, 2026 -35.0°F — Jan 10, 1982 2.00 in — Jan 23, 1988
February 69.1°F — Feb 28, 2024 -34.1°F — Feb 2, 1959 1.80 in — Feb 21, 1997
March 82.9°F — Mar 22, 2012 -23.1°F — Mar 1, 1962 2.10 in — Mar 31, 1998
April 88.0°F — Apr 22, 1980 1.0°F — Apr 7, 1982 2.67 in — Apr 20, 2023
May 93.9°F — May 30, 1999 3.0°F — May 20, 1899 2.73 in — May 18, 2000
June 100.0°F — Jun 21, 1988 27.0°F — Jun 14, 1897 4.95 in — Jun 8, 2008
July 105.1°F — Jul 31, 1999 39.0°F — Jul 1, 1965 3.95 in — Jul 21, 1999
August 100.9°F — Aug 1, 1988 36.0°F — Aug 27, 1986 4.60 in — Aug 27, 2018
September 97.0°F — Sep 1, 1953 23.0°F — Sep 24, 1976 5.20 in — Sep 10, 1986
October 89.1°F — Oct 1, 1982 9.0°F — Oct 27, 1898 4.22 in — Oct 2, 2019
November 75.0°F — Nov 10, 1999 -11.0°F — Nov 29, 1976 2.67 in — Nov 4, 2003
December 64.9°F — Dec 6, 2001 -29.0°F — Dec 19, 1983 1.64 in — Dec 15, 1893

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