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Boise Weather Records

Boise, Idaho weather data and records from 1940–2022 based on data compiled by the NOAA.
All data displayed in U.S. customary units.
All data displayed in metric units.
All-Time Recorded High
The highest temperature ever recorded in Boise, Idaho was 111.0 °F43.9 °C 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 -25.1 °F-31.7 °C which occurred on December 22, 1990.
Lowest Temperatures: All-Time By Year
Boise Weather by Month
Averages based on the years 1991–2020
Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Year
☀️ Average high (°F°C) 38.83.8 46.07.8 55.513.0 62.316.8 72.322.4 81.427.4 92.733.7 90.732.6 80.026.7 64.818.2 48.89.3 38.83.8 64.418.0
🌙 Average low (°F°C) 25.2-3.8 28.7-1.8 34.51.4 39.13.9 47.08.3 53.712.1 61.516.4 60.615.9 52.111.2 41.05.0 31.4-0.3 25.2-3.8 41.75.4
☀️ Record high (°F°C) 63.017.2 71.121.7 81.027.2 91.933.3 99.037.2 109.943.3 111.043.9 109.943.3 102.038.9 93.934.4 78.125.6 64.918.3 111.043.9
🌙 Record low (°F°C) -17.0-27.2 -15.0-26.1 6.1-14.4 19.0-7.2 21.9-5.6 30.9-0.6 35.11.7 34.01.1 23.0-5.0 10.9-11.7 -2.9-19.4 -25.1-31.7 -25.1-31.7
💧 Average precipitation (inchescm) 1.43.6 1.02.5 1.33.4 1.23.1 1.43.7 0.81.9 0.20.5 0.20.4 0.41.1 0.82.1 1.23.0 1.53.9 11.529.2
💧 Daily % chance precipitation 35.9 31.9 32.7 30.7 27.2 17.6 7.5 6.8 13.0 19.5 32.3 38.9 24.4
❄️ Average snow (inchescm) 5.313.5 3.38.5 1.23.1 0.10.3 0.00.0 0.00.0 0.00.0 0.00.0 0.00.0 0.10.3 2.05.1 5.514.0 17.644.8
❄️ Daily % chance snow 16.7 11.7 5.3 0.9 0.0 0.0 0.0 0.0 0.0 0.3 7.4 18.0 5.0
More Boise Weather Records
1940–2022
Highest daily low 80.1 °F26.7 °C July 19, 2021
Lowest daily high -6.0 °F-21.1 °C December 22, 1990
Most daily precipitation 1.9 inches4.9 cm June 12, 1958
Most monthly precipitation 4.4 inches11.2 cm May 1998
Most yearly precipitation 18.8 inches47.8 cm 1983
Earliest freeze September 13 1992
Latest freeze June 7 1995
Earliest snow October 10 2008
Latest snow May 12 1970
Most daily snow 9.8 inches24.9 cm December 20, 1996
Most monthly snow 26.3 inches66.7 cm December 1983
Most yearly snow 46.5 inches118.2 cm 1964
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
High temperature ≤ 32 °F0 °C
freezing temperatures
33 days Jan 2 – Feb 3, 1949
High temperature ≥ 80 °F27 °C 76 days Jun 27 – Sep 10, 2012
High temperature ≥ 90 °F32 °C 45 days Jun 17 – Jul 31, 2021
High temperature ≥ 100 °F38 °C 9 days Jun 28 – Jul 6, 2021
Boise Weather by Year
More
Weather Station Details
Years Station Coordinates
1940–2022 location