All-time weather records — Hartford, CT

Record high
102.9°F
July 22, 2011
Record low
-24.0°F
February 16, 1943
Wettest day
6.10 in
September 20, 1938

Climate change signal in Hartford

16.1%

of Hartford's all-time daily heat records were set in the last decade (59 of 366 records since 2015).

2.5%

of all-time daily cold records were set in the last decade (9 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 #
1920s
22
10
1930s
31
13
1940s
38
57
1950s
32
40
1960s
24
63
1970s
32
25
1980s
31
52
1990s
42
92
2000s
35
3
2010s
43
10
2020s
36
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 1920, the latest in 2026. Period of observation: 1920-2026.

Records by month

Month Hottest day Coldest day Wettest day
January 71.1°F — Jan 6, 2007 -17.0°F — Jan 22, 1961 2.50 in — Jan 8, 1990
February 73.9°F — Feb 25, 1985 -24.0°F — Feb 16, 1943 2.77 in — Feb 13, 2008
March 86.0°F — Mar 29, 1945 -4.0°F — Mar 6, 1948 2.80 in — Mar 28, 1932
April 93.9°F — Apr 17, 2002 5.0°F — Apr 13, 1997 2.99 in — Apr 11, 1983
May 99.0°F — May 21, 1996 16.0°F — May 24, 1997 3.67 in — May 31, 1940
June 100.0°F — Jun 24, 2025 30.0°F — Jun 6, 1997 3.50 in — Jun 6, 1982
July 102.9°F — Jul 22, 2011 34.0°F — Jul 17, 2019 3.59 in — Jul 24, 1988
August 102.9°F — Aug 9, 2001 37.0°F — Aug 3, 2020 5.25 in — Aug 19, 1955
September 100.9°F — Sep 2, 1953 28.9°F — Sep 24, 1963 6.10 in — Sep 20, 1938
October 89.1°F — Oct 1, 1927 15.1°F — Oct 26, 1996 4.33 in — Oct 14, 2005
November 82.9°F — Nov 2, 1950 5.0°F — Nov 17, 1996 3.34 in — Nov 28, 1937
December 75.0°F — Dec 8, 1998 -11.9°F — Dec 30, 1933 2.50 in — Dec 25, 2020

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