All-time weather records — St. Charles, ID

Record high
99.0°F
July 27, 1931
Record low
-41.1°F
February 1, 1985
Wettest day
1.96 in
June 18, 2018

Climate change signal in St. Charles

12%

of St. Charles's all-time daily heat records were set in the last decade (44 of 366 records since 2015).

9.3%

of all-time daily cold records were set in the last decade (34 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 #
1910s
·
4
1920s
26
39
1930s
71
42
1940s
33
35
1950s
17
32
1960s
16
50
1970s
19
40
1980s
24
31
1990s
46
35
2000s
65
19
2010s
24
18
2020s
25
21

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 1920, the latest in 2026. Period of observation: 1919-2026.

Records by month

Month Hottest day Coldest day Wettest day
January 59.0°F — Jan 11, 1940 -40.0°F — Jan 29, 1949 0.83 in — Jan 9, 2005
February 55.0°F — Feb 1, 2003 -41.1°F — Feb 1, 1985 1.47 in — Feb 18, 1986
March 72.0°F — Mar 20, 2026 -29.0°F — Mar 1, 1922 1.30 in — Mar 3, 2026
April 77.0°F — Apr 29, 2007 -11.0°F — Apr 2, 1936 1.23 in — Apr 30, 1978
May 90.0°F — May 30, 2003 19.0°F — May 6, 1965 1.86 in — May 11, 1983
June 93.9°F — Jun 26, 1988 26.1°F — Jun 1, 1920 1.96 in — Jun 18, 2018
July 99.0°F — Jul 27, 1931 28.9°F — Jul 19, 1987 1.85 in — Jul 15, 1974
August 96.1°F — Aug 2, 2000 30.0°F — Aug 26, 1992 1.70 in — Aug 18, 1977
September 91.0°F — Sep 5, 2022 14.0°F — Sep 25, 1926 1.64 in — Sep 26, 1982
October 81.0°F — Oct 2, 1992 -5.1°F — Oct 31, 2019 1.36 in — Oct 17, 2016
November 66.0°F — Nov 2, 2008 -18.0°F — Nov 16, 1955 1.27 in — Nov 17, 2025
December 60.1°F — Dec 10, 1939 -33.0°F — Dec 30, 1978 1.29 in — Dec 23, 1964

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