Boise Weather Records

Boise, Idaho weather averages and records from 1911–2023 based on data made available by the NOAA.
All-Time Recorded High
The highest temperature ever recorded in Boise, Idaho was 111 °F which occurred on July 19, 1960.
Highest Temperatures: All-Time By Year
All-Time Recorded Low
The lowest temperature ever recorded in Boise, Idaho was -30 °F which occurred on December 25, 1924.
Lowest Temperatures: All-Time By Year
Boise Weather by Month
Averages based on the years 1991–2020
Month Average (°F) Record (°F) Average (inches)
High ☀️ Low 🌙 High ☀️ Low 🌙 Precipitation 💧 Snow ❄️
January 38.8 25.2 63 -26 1.4 5.3
February 46.0 28.7 71 -16 1.0 3.3
March 55.5 34.5 81 6 1.3 1.2
April 62.3 39.1 92 7 1.2 0.1
May 72.3 47.0 101 22 1.4 0.0
June 81.4 53.7 110 29 0.8 0.0
July 92.7 61.5 111 35 0.2 0.0
August 90.7 60.6 110 34 0.2 0.0
September 80.0 52.1 105 22 0.4 0.0
October 64.8 41.0 94 11 0.8 0.1
November 48.8 31.4 78 -3 1.2 2.0
December 38.8 25.2 69 -30 1.5 5.5
Entire year 64.4 41.7 111 -30 11.5 17.6
More Boise Weather Records
1911–2023
Highest daily low 80 °F July 19, 2021
Lowest daily high -6 °F December 22, 1990
Greatest daily range
(Difference of high and low)
60 °F July 20, 1931
Difference in high temperature
over two conscutive days
36 °F Jun 4–5, 2012
Most daily precipitation 1.9 inches June 12, 1958
Most monthly precipitation 4.4 inches May 1998
Most yearly precipitation 18.8 inches 1983
Earliest freeze September 7 1927
Latest freeze June 11 1917
Earliest snow in season October 10 2008
Latest snow in season May 12 1970
Most daily snow 15.0 inches February 2, 1916
Most monthly snow 40.0 inches January 1929
Most yearly snow 57.7 inches 1929
Greatest snow accumulation 27.0 inches January 20, 1930
Most days in a year ≥ 80 °F 139 1931
Most days in a year ≥ 90 °F 83 1930
Most days in a year ≥ 100 °F 27 2022
Boise Weather Streaks
Most consecutive days...
With precipitation 16 days Jan 9–24, 1970
Without precipitation 94 days Jul 4 – Oct 5, 1943
With snow 8 days Jan 25 – Feb 1, 1969
Freezing temperatures
High temperature ≤ 32 °F
33 days Jan 2 – Feb 3, 1949
High temperature ≥ 80 °F 84 days Jun 13 – Sep 4, 1919
High temperature ≥ 90 °F 45 days Jun 17 – Jul 31, 2021
High temperature ≥ 100 °F 13 days Jul 17–29, 1931
Boise Weather by Year
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Weather Station Details
Years Station Coordinates
1940–2023 location
1911–1939 Meridian 1 W location