All-time weather records — St. Marys, PA

Record high
100.0°F
July 23, 2011
Record low
-25.1°F
February 16, 2015
Wettest day
4.34 in
August 14, 1994

Climate change signal in St. Marys

44.3%

of St. Marys's all-time daily heat records were set in the last decade (162 of 366 records since 2015).

30.1%

of all-time daily cold records were set in the last decade (110 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
5
4
1960s
4
44
1970s
9
7
1980s
·
2
1990s
·
·
2000s
99
109
2010s
154
162
2020s
95
38

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 1955, the latest in 2025. Period of observation: 1942-2025.

Records by month

Month Hottest day Coldest day Wettest day
January 64.0°F — Jan 9, 2008 -20.9°F — Jan 24, 2011 1.90 in — Jan 12, 2018
February 70.0°F — Feb 25, 2017 -25.1°F — Feb 16, 2015 1.65 in — Feb 10, 1959
March 79.0°F — Mar 24, 2012 -20.0°F — Mar 1, 2015 1.92 in — Mar 9, 2009
April 87.1°F — Apr 28, 2009 10.0°F — Apr 1, 1969 2.58 in — Apr 29, 1981
May 89.1°F — May 30, 2006 19.9°F — May 9, 2020 2.67 in — May 23, 1953
June 91.0°F — Jun 23, 2024 32.0°F — Jun 1, 2009 3.20 in — Jun 23, 1972
July 100.0°F — Jul 23, 2011 39.9°F — Jul 1, 2010 3.60 in — Jul 22, 2003
August 91.0°F — Aug 2, 2024 39.9°F — Aug 4, 1966 4.34 in — Aug 14, 1994
September 91.9°F — Sep 4, 2011 30.0°F — Sep 19, 2020 3.85 in — Sep 29, 1967
October 84.0°F — Oct 2, 2019 14.0°F — Oct 24, 1969 2.63 in — Oct 19, 1996
November 75.9°F — Nov 5, 2003 5.0°F — Nov 20, 2014 2.79 in — Nov 28, 1993
December 66.0°F — Dec 5, 2012 -9.9°F — Dec 21, 2004 3.11 in — Dec 1, 2010

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