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Boise Weather Records

Boise, Idaho weather averages and records from 1940–2022 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 -25 °F which occurred on December 22, 1990.
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 -17 1.4 5.3
February 46.0 28.7 71 -15 1.0 3.3
March 55.5 34.5 81 6 1.3 1.2
April 62.3 39.1 92 19 1.2 0.1
May 72.3 47.0 99 22 1.4 0.0
June 81.4 53.7 110 31 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 52.1 104 23 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 65 -25 1.5 5.5
Entire year 64.4 41.7 111 -25 11.5 17.6
More Boise Weather Records
1940–2022
Highest daily low 80 °F July 19, 2021
Lowest daily high -6 °F December 22, 1990
Greatest daily range
(Difference of high and low)
49 °F June 22, 1961
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 13 1992
Latest freeze June 7 1995
Earliest snow in season October 10 2008
Latest snow in season May 12 1970
Most daily snow 9.8 inches December 20, 1996
Most monthly snow 26.3 inches December 1983
Most yearly snow 46.5 inches 1964
Most days in a year ≥ 80 °F 123 2003
Most days in a year ≥ 90 °F 73 2013
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 80 days Jun 21 – Sep 8, 2022
High temperature ≥ 90 °F 45 days Jun 17 – Jul 31, 2021
High temperature ≥ 100 °F 9 days Jun 28 – Jul 6, 2021
Boise Weather by Year
More
Weather Station Details
Years Station Coordinates
1940–2022 location