All-time weather records — Chinook, MT

Record high
109.9°F
July 27, 1917
Record low
-53.0°F
December 21, 1989
Wettest day
5.50 in
September 24, 1986

Climate change signal in Chinook

8.2%

of Chinook's all-time daily heat records were set in the last decade (30 of 366 records since 2015).

5.5%

of all-time daily cold records were set in the last decade (20 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
12
12
1900s
26
46
1910s
39
37
1920s
27
38
1930s
60
29
1940s
20
44
1950s
19
35
1960s
29
15
1970s
5
16
1980s
32
43
1990s
40
15
2000s
24
14
2010s
18
10
2020s
15
12

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 1896, the latest in 2026. Period of observation: 1895-2026.

Records by month

Month Hottest day Coldest day Wettest day
January 82.0°F — Jan 28, 1984 -50.1°F — Jan 20, 1954 1.20 in — Jan 11, 2013
February 75.9°F — Feb 19, 1930 -51.0°F — Feb 14, 1936 0.99 in — Feb 14, 1904
March 82.0°F — Mar 31, 2004 -38.0°F — Mar 5, 1947 1.10 in — Mar 20, 2012
April 93.9°F — Apr 26, 1910 -13.0°F — Apr 1, 1908 2.11 in — Apr 4, 1955
May 98.1°F — May 16, 1901 10.9°F — May 2, 1954 2.36 in — May 17, 1949
June 109.0°F — Jun 21, 1900 28.0°F — Jun 1, 1979 3.55 in — Jun 22, 1938
July 109.9°F — Jul 27, 1917 32.0°F — Jul 30, 1986 3.15 in — Jul 10, 1983
August 109.0°F — Aug 1, 1908 30.0°F — Aug 25, 1910 3.29 in — Aug 21, 1933
September 104.0°F — Sep 4, 1998 12.9°F — Sep 21, 1995 5.50 in — Sep 24, 1986
October 90.0°F — Oct 1, 1992 -24.0°F — Oct 29, 1991 1.30 in — Oct 4, 2016
November 82.0°F — Nov 5, 1921 -38.0°F — Nov 23, 1985 1.05 in — Nov 13, 1932
December 70.0°F — Dec 5, 1905 -53.0°F — Dec 21, 1989 0.99 in — Dec 10, 1904

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