All-time weather records — Boise City, ID

Record high
111.0°F
July 19, 1960
Record low
-25.1°F
December 22, 1990
Wettest day
1.91 in
June 12, 1958

Climate change signal in Boise City

19.7%

of Boise City's all-time daily heat records were set in the last decade (72 of 366 records since 2015).

2.5%

of all-time daily cold records were set in the last decade (9 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 #
1940s
32
46
1950s
32
53
1960s
50
54
1970s
21
61
1980s
35
84
1990s
53
53
2000s
52
3
2010s
45
10
2020s
46
2

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 1940, the latest in 2026. Period of observation: 1931-2026.

Records by month

Month Hottest day Coldest day Wettest day
January 66.0°F — Jan 31, 2024 -17.0°F — Jan 31, 1950 1.13 in — Jan 18, 1953
February 71.1°F — Mar 1, 1992 -15.0°F — Feb 5, 1989 0.92 in — Feb 4, 1951
March 82.9°F — Mar 20, 2026 6.1°F — Mar 1, 1971 1.60 in — Mar 20, 1981
April 91.9°F — Apr 25, 1946 19.0°F — Apr 13, 1968 1.27 in — Apr 6, 1969
May 100.0°F — May 31, 2025 21.9°F — May 5, 1982 1.77 in — May 29, 1990
June 109.9°F — Jun 28, 2015 30.9°F — Jun 1, 1984 1.91 in — Jun 12, 1958
July 111.0°F — Jul 19, 1960 35.1°F — Jul 5, 1986 0.94 in — Jul 30, 1960
August 109.9°F — Aug 4, 1961 34.0°F — Aug 24, 1992 1.61 in — Aug 13, 1979
September 104.0°F — Sep 7, 2022 23.0°F — Sep 14, 1970 1.73 in — Sep 11, 1976
October 93.9°F — Oct 1, 1992 10.9°F — Oct 29, 1971 0.95 in — Oct 9, 2018
November 78.1°F — Nov 6, 1999 -2.9°F — Nov 15, 1955 1.15 in — Nov 1, 2014
December 64.9°F — Dec 22, 1964 -25.1°F — Dec 22, 1990 1.03 in — Dec 23, 1955

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