All-time weather records — East Helena, MT

Record high
105.1°F
July 12, 2002
Record low
-42.0°F
January 25, 1957
Wettest day
2.06 in
May 3, 1964

Climate change signal in East Helena

23.2%

of East Helena's all-time daily heat records were set in the last decade (85 of 366 records since 2015).

4.6%

of all-time daily cold records were set in the last decade (17 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
14
11
1940s
22
54
1950s
30
85
1960s
45
46
1970s
16
41
1980s
41
36
1990s
44
58
2000s
60
12
2010s
38
11
2020s
56
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 1938, the latest in 2026. Period of observation: 1938-2026.

Records by month

Month Hottest day Coldest day Wettest day
January 63.0°F — Jan 25, 2015 -42.0°F — Jan 25, 1957 0.71 in — Jan 18, 2012
February 69.1°F — Feb 24, 1995 -42.0°F — Feb 2, 1996 0.58 in — Feb 7, 2024
March 78.1°F — Mar 30, 2004 -29.9°F — Mar 25, 1955 0.70 in — Mar 23, 1945
April 86.0°F — Apr 28, 1939 1.0°F — Apr 2, 1954 0.98 in — Apr 19, 1984
May 93.0°F — May 24, 2001 17.1°F — May 2, 1954 2.06 in — May 3, 1964
June 104.0°F — Jun 14, 2021 30.0°F — Jun 10, 1999 1.77 in — Jun 18, 1979
July 105.1°F — Jul 12, 2002 36.0°F — Jul 4, 1971 1.36 in — Jul 30, 1975
August 105.1°F — Aug 24, 1969 28.0°F — Aug 25, 1992 1.82 in — Aug 21, 1983
September 102.0°F — Sep 7, 2022 18.0°F — Sep 14, 1970 1.61 in — Sep 11, 1980
October 89.1°F — Oct 4, 2024 -8.0°F — Oct 30, 1991 0.80 in — Oct 23, 1954
November 75.9°F — Nov 5, 2020 -38.9°F — Nov 16, 1959 0.85 in — Nov 8, 2012
December 70.0°F — Dec 1, 2021 -38.0°F — Dec 17, 1964 0.64 in — Dec 29, 2017

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