Boulder Montana Climate Data

Monthly Average Climate Data for Boulder Montana

Switch Data to Celsius/Metric Units
MonthAvg. LowAvg. HighAvg. Precip
January11.8 °F34.3 °F0.3 in.
February14.4 °F37.3 °F0.26 in.
March20.8 °F45.7 °F0.5 in.
April27.0 °F53.5 °F0.85 in.
May35.1 °F62.8 °F1.95 in.
June42.2 °F71.0 °F2.35 in.
July47.6 °F82.3 °F1.53 in.
August45.6 °F81.6 °F1.05 in.
September37.9 °F70.8 °F0.93 in.
October28.3 °F56.6 °F0.75 in.
November18.8 °F42.2 °F0.62 in.
December11.6 °F33.3 °F0.41 in.
Annual28.4 °F56 °F11.5 in.

Climate Data for Boulder Montana

Average First Frost DateSep.1 - Sep. 10
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 ConditionsModerate Drought
Köppen Climate ClassificationDfb - Humid Continental Mild Summer, Wet All Year