All-time weather records — Westby, MT

Record high
111.9°F
July 5, 1937
Record low
-45.0°F
January 20, 1954
Wettest day
4.50 in
July 2, 1990

Climate change signal in Westby

10.7%

of Westby's all-time daily heat records were set in the last decade (39 of 366 records since 2015).

10.1%

of all-time daily cold records were set in the last decade (37 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
31
17
1940s
47
53
1950s
28
54
1960s
37
43
1970s
34
35
1980s
62
32
1990s
37
40
2000s
38
46
2010s
29
22
2020s
23
24

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 2025. Period of observation: 1937-2026.

Records by month

Month Hottest day Coldest day Wettest day
January 57.0°F — Jan 31, 2024 -45.0°F — Jan 20, 1954 2.00 in — Jan 13, 2011
February 66.0°F — Feb 28, 1992 -42.0°F — Feb 28, 1962 0.90 in — Feb 11, 2016
March 77.0°F — Mar 27, 1946 -33.0°F — Mar 10, 1948 0.98 in — Mar 17, 1943
April 91.0°F — Apr 20, 1980 -18.0°F — Apr 2, 1975 1.46 in — Apr 19, 1955
May 102.0°F — May 22, 1980 10.0°F — May 8, 1945 3.02 in — May 25, 1942
June 102.9°F — Jun 20, 1988 28.0°F — Jun 1, 1951 2.90 in — Jun 3, 1953
July 111.9°F — Jul 5, 1937 35.1°F — Jul 2, 1987 4.50 in — Jul 2, 1990
August 108.0°F — Aug 6, 1983 28.9°F — Aug 24, 1958 2.53 in — Aug 5, 1965
September 102.9°F — Sep 1, 1983 15.1°F — Sep 30, 1961 2.17 in — Sep 16, 1963
October 91.9°F — Oct 1, 1992 -6.0°F — Oct 24, 2020 1.41 in — Oct 5, 1937
November 73.0°F — Nov 1, 1999 -26.0°F — Nov 24, 1996 1.79 in — Nov 2, 2000
December 61.0°F — Dec 6, 1939 -42.0°F — Dec 23, 1983 0.95 in — Dec 30, 1965

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