All-time weather records — Groton, NY

Record high
99.0°F
July 22, 2011
Record low
-29.0°F
February 24, 2015
Wettest day
4.79 in
October 28, 1981

Climate change signal in Groton

77.3%

of Groton's all-time daily heat records were set in the last decade (283 of 366 records since 2015).

63.7%

of all-time daily cold records were set in the last decade (233 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
·
·
1950s
·
·
1960s
·
·
1970s
·
5
1980s
·
·
1990s
·
·
2000s
6
10
2010s
192
262
2020s
168
89

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 2009, the latest in 2026. Period of observation: 1948-2026.

Records by month

Month Hottest day Coldest day Wettest day
January 64.0°F — Jan 12, 2020 -20.9°F — Jan 24, 2011 1.67 in — Jan 20, 1996
February 71.1°F — Feb 25, 2017 -29.0°F — Feb 24, 2015 1.74 in — Feb 4, 1961
March 75.9°F — Mar 22, 2012 -17.0°F — Mar 6, 2015 2.49 in — Mar 30, 1984
April 84.9°F — Apr 15, 2023 -4.0°F — Apr 5, 2016 2.34 in — Apr 3, 2005
May 89.1°F — May 22, 2022 21.9°F — May 13, 2020 2.29 in — May 12, 1995
June 91.9°F — Jun 24, 2025 32.0°F — Jun 1, 2009 3.58 in — Jun 22, 1972
July 99.0°F — Jul 22, 2011 42.1°F — Jul 5, 2009 3.16 in — Jul 10, 1952
August 93.0°F — Aug 19, 2009 39.9°F — Aug 26, 2017 4.55 in — Aug 9, 2013
September 91.0°F — Sep 7, 2023 28.9°F — Sep 19, 2020 4.10 in — Sep 25, 2001
October 84.0°F — Oct 2, 2019 21.9°F — Oct 13, 2012 4.79 in — Oct 28, 1981
November 75.9°F — Nov 1, 2024 -5.1°F — Nov 23, 2018 3.60 in — Nov 9, 1996
December 64.9°F — Dec 5, 2012 -8.0°F — Dec 17, 2013 1.84 in — Dec 14, 1983

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