Jefferson City Montana Climate Data

Monthly Average Climate Data for Jefferson City Montana

Switch Data to Celsius/Metric Units
MonthAvg. LowAvg. HighAvg. Precip
January12.5 °F34.2 °F0.73 in.
February14.1 °F37.0 °F0.85 in.
March20.8 °F45.5 °F0.8 in.
April27.5 °F53.4 °F1.7 in.
May35.8 °F62.4 °F2.66 in.
June42.5 °F71.4 °F3.01 in.
July47.8 °F82.4 °F1.31 in.
August45.5 °F81.6 °F1.38 in.
September38.5 °F70.7 °F1.41 in.
October29.0 °F56.2 °F1.43 in.
November20.1 °F42.1 °F0.77 in.
December12.5 °F33.2 °F0.91 in.
Annual28.9 °F55.8 °F16.96 in.

Climate Data for Jefferson City Montana

Average First Frost DateSep.1 - Sep. 10
Average Last Frost DateJun. 11 - Jun. 20
Average Days With FrostOver 180 Days
Plant Hardiness Zone - 2023Zone 4b : -25°F to -20°F
Plant Hardiness Zone - 2012Zone 4b : -25°F to -20°F
Current Drought ConditionsSevere Drought
Köppen Climate ClassificationDfb - Humid Continental Mild Summer, Wet All Year