All-time weather records — Herndon, VA

Record high
105.1°F
July 22, 2011
Record low
-18.0°F
January 22, 1984
Wettest day
10.67 in
June 21, 1972

Climate change signal in Herndon

21.3%

of Herndon's all-time daily heat records were set in the last decade (78 of 366 records since 2015).

3.6%

of all-time daily cold records were set in the last decade (13 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 #
1960s
43
83
1970s
43
110
1980s
52
97
1990s
77
40
2000s
44
15
2010s
57
20
2020s
50
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 1960, the latest in 2026. Period of observation: 1960-2026.

Records by month

Month Hottest day Coldest day Wettest day
January 79.0°F — Jan 26, 2024 -18.0°F — Jan 22, 1984 2.00 in — Jan 30, 2013
February 80.1°F — Feb 21, 2018 -14.1°F — Feb 18, 1979 2.33 in — Feb 16, 2003
March 89.1°F — Mar 12, 1990 -0.9°F — Mar 15, 1993 2.69 in — Mar 21, 2019
April 93.0°F — Apr 6, 2010 17.1°F — Apr 1, 1969 3.99 in — Apr 30, 2014
May 97.0°F — May 29, 1969 28.0°F — May 7, 1970 3.73 in — May 11, 2008
June 102.0°F — Jun 29, 2012 36.0°F — Jun 8, 1977 10.67 in — Jun 21, 1972
July 105.1°F — Jul 22, 2011 41.0°F — Jul 1, 1988 5.02 in — Jul 21, 2018
August 104.0°F — Aug 20, 1983 37.9°F — Aug 29, 1982 4.68 in — Aug 11, 1984
September 100.0°F — Sep 6, 2023 30.0°F — Sep 24, 1974 5.52 in — Sep 14, 1966
October 96.1°F — Oct 2, 2019 15.1°F — Oct 24, 1969 4.26 in — Oct 29, 2012
November 84.0°F — Nov 1, 1982 9.0°F — Nov 24, 1989 2.59 in — Nov 27, 1993
December 79.0°F — Dec 6, 1998 -4.0°F — Dec 25, 1989 2.92 in — Dec 18, 1977

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