Custer Montana Climate Data

Monthly Average Climate Data for Custer Montana

Switch Data to Celsius/Metric Units
MonthAvg. LowAvg. HighAvg. Precip
January12.3 °F35.1 °F0.51 in.
February14.8 °F39.1 °F0.45 in.
March23.4 °F50.5 °F0.86 in.
April32.6 °F60.2 °F1.47 in.
May42.5 °F69.3 °F2.09 in.
June51.6 °F79.0 °F2.5 in.
July57.5 °F88.2 °F1.52 in.
August55.3 °F87.7 °F0.92 in.
September45.7 °F77.1 °F1.07 in.
October33.4 °F61.9 °F1.5 in.
November22.7 °F47.7 °F0.63 in.
December13.8 °F36.9 °F0.46 in.
Annual33.8 °F61.1 °F13.98 in.

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 : -25°F to -20°F
Plant Hardiness Zone - 2012Zone 4a : -30°F to -25°F
Current Drought ConditionsNormal
Köppen Climate ClassificationBSk - Cold Semi-Arid Climate