Boise Idaho Climate Data

Monthly Average Climate Data for Boise Idaho

Switch Data to Fahrenheit
MonthAvg. LowAvg. HighAvg. Precip
January-4.2 °C4.2 °C42.67 mm
February-2.6 °C8.2 °C30.99 mm
March0.4 °C13.4 °C41.4 mm
April2.8 °C17.3 °C36.07 mm
May6.9 °C22.6 °C41.4 mm
June10.7 °C27.6 °C22.86 mm
July14.5 °C33.6 °C8.64 mm
August13.6 °C32.7 °C5.33 mm
September9.2 °C26.9 °C11.68 mm
October3.6 °C19 °C22.61 mm
November-1.1 °C10.1 °C33.27 mm
December-4.2 °C4.3 °C47.5 mm
Annual4.1 °C18.3 °C344.42 mm

Climate Data for Boise Idaho

Average First Frost DateOct. 11 - Oct. 20
Average Last Frost DateMay 11 - May 20
Average Days With Frost100-125 Days
Plant Hardiness Zone - 2023Zone 7a : -17.8°C to -15°C
Plant Hardiness Zone - 2012Zone 7a : -17.8°C to -15°C
Current Drought ConditionsNormal
Köppen Climate ClassificationBSk - Cold Semi-Arid Climate
2024 plantmaps.com