All-time weather records — Lancaster, PA

Record high
102.9°F
July 22, 2011
Record low
-16.1°F
January 21, 1994
Wettest day
6.11 in
September 16, 1999

Climate change signal in Lancaster

34.4%

of Lancaster's all-time daily heat records were set in the last decade (126 of 366 records since 2015).

16.9%

of all-time daily cold records were set in the last decade (62 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
2
7
1950s
·
·
1970s
14
34
1980s
56
153
1990s
69
54
2000s
61
32
2010s
85
67
2020s
79
19

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 1949, the latest in 2025. Period of observation: 1948-2026.

Records by month

Month Hottest day Coldest day Wettest day
January 70.0°F — Jan 29, 2002 -16.1°F — Jan 21, 1994 2.04 in — Jan 9, 2024
February 82.0°F — Feb 21, 2018 -9.0°F — Feb 18, 1979 1.88 in — Feb 6, 2004
March 88.0°F — Mar 30, 1998 -2.0°F — Mar 10, 1984 3.24 in — Mar 21, 2000
April 93.0°F — Apr 17, 2002 16.0°F — Apr 7, 1982 2.45 in — Apr 22, 2006
May 99.0°F — May 24, 1995 21.0°F — May 9, 2020 2.80 in — May 5, 1989
June 99.0°F — Jun 22, 2024 33.1°F — Jun 4, 2019 3.05 in — Jun 1, 2012
July 102.9°F — Jul 22, 2011 46.0°F — Jul 1, 1986 4.54 in — Jul 7, 1984
August 100.9°F — Aug 2, 2002 37.0°F — Aug 30, 1986 4.60 in — Aug 28, 1978
September 99.0°F — Sep 2, 1980 34.0°F — Sep 18, 1986 6.11 in — Sep 16, 1999
October 93.0°F — Oct 2, 2019 23.0°F — Oct 31, 1988 5.60 in — Oct 8, 2005
November 86.0°F — Nov 3, 2003 10.9°F — Nov 23, 2018 3.30 in — Nov 25, 1950
December 75.9°F — Dec 7, 1998 -2.9°F — Dec 25, 1983 2.60 in — Dec 12, 1983

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