Garrison Montana Climate Data

Monthly Average Climate Data for Garrison Montana

Switch Data to Celsius/Metric Units
MonthAvg. LowAvg. HighAvg. Precip
January11.3 °F32.7 °F0.5 in.
February13.2 °F36.4 °F0.46 in.
March20.2 °F45.8 °F0.43 in.
April26.5 °F54.6 °F0.84 in.
May33.8 °F64.0 °F1.72 in.
June40.5 °F71.3 °F1.91 in.
July45.1 °F82.8 °F1.04 in.
August43.1 °F82.1 °F0.99 in.
September35.8 °F71.7 °F0.98 in.
October27.0 °F56.9 °F0.7 in.
November18.2 °F41.3 °F0.52 in.
December11.2 °F31.8 °F0.49 in.
Annual27.2 °F56 °F10.58 in.

Climate Data for Garrison Montana

Average First Frost DateAug. 11 - Aug. 20
Average Last Frost DateJun. 21 - Jun. 30
Average Days With FrostOver 180 Days
Plant Hardiness Zone - 2023Zone 4b : -25°F to -20°F
Plant Hardiness Zone - 2012Zone 4a : -30°F to -25°F
Current Drought ConditionsSevere Drought
Köppen Climate ClassificationDfb - Humid Continental Mild Summer, Wet All Year