Boise Idaho Climate Data

Monthly Average Climate Data for Boise Idaho

Switch Data to Celsius/Metric Units
MonthAvg. LowAvg. HighAvg. Precip
January24.5 °F39.6 °F1.68 in.
February27.4 °F46.7 °F1.22 in.
March32.7 °F56.1 °F1.63 in.
April37.0 °F63.2 °F1.42 in.
May44.5 °F72.6 °F1.63 in.
June51.3 °F81.6 °F0.9 in.
July58.1 °F92.5 °F0.34 in.
August56.4 °F90.8 °F0.21 in.
September48.5 °F80.5 °F0.46 in.
October38.4 °F66.2 °F0.89 in.
November30.0 °F50.2 °F1.31 in.
December24.5 °F39.8 °F1.87 in.
Annual39.4 °F65 °F13.56 in.

Climate Data for Boise Idaho

Average First Frost DateOct. 11 - Oct. 20
Average Last Frost DateMay 1 - May 10
Average Days With Frost100-125 Days
Plant Hardiness Zone - 2023Zone 7a : 0°F to 5°F
Plant Hardiness Zone - 2012Zone 7a : 0°F to 5°F
Current Drought ConditionsModerate Drought
Köppen Climate ClassificationBSk - Cold Semi-Arid Climate
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