All-time weather records — Boston, MA

Record high
102.9°F
July 22, 2011
Record low
-14.1°F
February 15, 1943
Wettest day
7.06 in
August 19, 1955

Climate change signal in Boston

15.3%

of Boston's all-time daily heat records were set in the last decade (56 of 366 records since 2015).

6%

of all-time daily cold records were set in the last decade (22 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 #
1930s
10
38
1940s
59
79
1950s
43
38
1960s
25
62
1970s
32
34
1980s
34
44
1990s
51
22
2000s
34
21
2010s
45
21
2020s
33
7

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 1937, the latest in 2026. Period of observation: 1936-2026.

Records by month

Month Hottest day Coldest day Wettest day
January 73.9°F — Jan 12, 2020 -11.9°F — Jan 15, 1957 2.52 in — Jan 21, 1979
February 73.0°F — Feb 24, 2017 -14.1°F — Feb 15, 1943 2.66 in — Feb 13, 2008
March 89.1°F — Mar 31, 1998 1.0°F — Mar 5, 1948 3.49 in — Mar 18, 1968
April 93.9°F — Apr 18, 1976 16.0°F — Apr 7, 1982 4.29 in — Apr 1, 2004
May 96.1°F — May 31, 1944 34.0°F — May 8, 1956 4.47 in — May 16, 1954
June 102.0°F — Jun 24, 2025 41.0°F — Jun 1, 1945 5.69 in — Jun 13, 1998
July 102.9°F — Jul 22, 2011 50.0°F — Jul 1, 1988 3.36 in — Jul 13, 1996
August 102.0°F — Aug 2, 1975 46.0°F — Aug 25, 1940 7.06 in — Aug 19, 1955
September 100.0°F — Sep 2, 1953 37.0°F — Sep 27, 1947 5.63 in — Sep 11, 1954
October 90.0°F — Oct 7, 1963 25.0°F — Oct 27, 1936 6.11 in — Oct 20, 1996
November 82.9°F — Nov 2, 1950 12.0°F — Nov 26, 1938 3.31 in — Nov 23, 1992
December 75.9°F — Dec 7, 1998 -11.0°F — Dec 20, 1942 4.21 in — Dec 12, 1992

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