All-time weather records — Hamilton, MT

Record high
105.1°F
July 23, 1895
Record low
-38.9°F
February 4, 1899
Wettest day
2.23 in
May 15, 1952

Climate change signal in Hamilton

8.5%

of Hamilton's all-time daily heat records were set in the last decade (31 of 366 records since 2015).

6.6%

of all-time daily cold records were set in the last decade (24 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 #
1890s
4
52
1900s
43
41
1910s
29
24
1920s
13
8
1930s
65
47
1940s
18
14
1950s
22
30
1960s
30
22
1970s
11
34
1980s
34
34
1990s
25
13
2000s
25
14
2010s
36
20
2020s
11
13

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 1895, the latest in 2024. Period of observation: 1895-2024.

Records by month

Month Hottest day Coldest day Wettest day
January 64.9°F — Jan 26, 2015 -36.0°F — Jan 21, 1937 1.09 in — Jan 15, 1974
February 71.1°F — Feb 1, 1934 -38.9°F — Feb 4, 1899 1.12 in — Feb 7, 1938
March 82.0°F — Mar 18, 1941 -14.1°F — Mar 4, 2019 0.73 in — Mar 5, 1951
April 90.0°F — Apr 18, 1936 1.0°F — Apr 1, 1936 1.34 in — Apr 10, 1996
May 102.0°F — May 30, 1936 0.0°F — May 14, 1901 2.23 in — May 15, 1952
June 102.0°F — Jun 29, 2015 24.1°F — Jun 6, 1924 1.93 in — Jun 25, 1965
July 105.1°F — Jul 23, 1895 30.9°F — Jul 7, 1971 1.49 in — Jul 14, 2011
August 102.9°F — Aug 24, 1969 19.0°F — Aug 18, 1895 1.74 in — Aug 20, 1974
September 98.1°F — Sep 1, 1967 10.0°F — Sep 7, 1895 1.70 in — Sep 6, 1911
October 90.0°F — Oct 1, 1901 -5.1°F — Oct 25, 2020 1.19 in — Oct 11, 1911
November 75.9°F — Nov 12, 1999 -24.0°F — Nov 16, 1955 1.55 in — Nov 20, 1962
December 66.0°F — Dec 2, 2021 -31.0°F — Dec 9, 1972 1.58 in — Dec 22, 1964

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