Custer Montana Climate Data

Monthly Average Climate Data for Custer Montana

Switch Data to Fahrenheit
MonthAvg. LowAvg. HighAvg. Precip
January-10.9 °C1.7 °C12.95 mm
February-9.6 °C3.9 °C11.43 mm
March-4.8 °C10.3 °C21.84 mm
April0.3 °C15.7 °C37.34 mm
May5.8 °C20.7 °C53.09 mm
June10.9 °C26.1 °C63.5 mm
July14.2 °C31.2 °C38.61 mm
August12.9 °C30.9 °C23.37 mm
September7.6 °C25.1 °C27.18 mm
October0.8 °C16.6 °C38.1 mm
November-5.2 °C8.7 °C16 mm
December-10.1 °C2.7 °C11.68 mm
Annual1 °C16.1 °C355.09 mm

Climate Data for Custer Montana

Average First Frost DateSep. 21 - Sep. 30
Average Last Frost DateJun. 1 - Jun. 10
Average Days With Frost150-180 Days
Plant Hardiness Zone - 2023Zone 4b : -31.7°C to -28.9°C
Plant Hardiness Zone - 2012Zone 4a : -34.4°C to -31.7°C
Current Drought ConditionsNormal
Köppen Climate ClassificationBSk - Cold Semi-Arid Climate
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