Jefferson City Montana Climate Data

Monthly Average Climate Data for Jefferson City Montana

Switch Data to Fahrenheit
MonthAvg. LowAvg. HighAvg. Precip
January-10.8 °C1.2 °C18.54 mm
February-9.9 °C2.8 °C21.59 mm
March-6.2 °C7.5 °C20.32 mm
April-2.5 °C11.9 °C43.18 mm
May2.1 °C16.9 °C67.56 mm
June5.8 °C21.9 °C76.45 mm
July8.8 °C28 °C33.27 mm
August7.5 °C27.6 °C35.05 mm
September3.6 °C21.5 °C35.81 mm
October-1.7 °C13.4 °C36.32 mm
November-6.6 °C5.6 °C19.56 mm
December-10.8 °C0.7 °C23.11 mm
Annual-1.7 °C13.3 °C430.76 mm

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 : -31.7°C to -28.9°C
Plant Hardiness Zone - 2012Zone 4b : -31.7°C to -28.9°C
Current Drought ConditionsNormal
Köppen Climate ClassificationDfb - Humid Continental Mild Summer, Wet All Year
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