Great Falls Montana Climate Data

Monthly Average Climate Data for Great Falls Montana

Switch Data to Celsius/Metric Units
MonthAvg. LowAvg. HighAvg. Precip
January15.9 °F36.2 °F0.61 in.
February16.6 °F38.3 °F0.57 in.
March23.5 °F46.8 °F0.66 in.
April32.0 °F56.0 °F1.68 in.
May40.9 °F65.5 °F2.19 in.
June48.5 °F73.7 °F2.71 in.
July54.1 °F84.7 °F1.21 in.
August52.7 °F84.1 °F1.11 in.
September44.7 °F73.0 °F1.3 in.
October34.4 °F58.8 °F1.14 in.
November25.3 °F45.8 °F0.79 in.
December17.7 °F37.0 °F0.59 in.
Annual33.9 °F58.3 °F14.56 in.

Climate Data for Great Falls 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