Johnstown Wyoming Climate Data

Monthly Average Climate Data for Johnstown Wyoming

Switch Data to Fahrenheit
MonthAvg. LowAvg. HighAvg. Precip
January-13.5 °C0.9 °C7.62 mm
February-11.5 °C3.4 °C9.14 mm
March-5.6 °C9.9 °C16.26 mm
April-1.3 °C14.2 °C35.56 mm
May3.8 °C19.3 °C56.39 mm
June8.2 °C25.7 °C27.69 mm
July12.1 °C31 °C16.76 mm
August10.8 °C29.9 °C14.48 mm
September6.1 °C23.9 °C22.86 mm
October-0.3 °C15.7 °C20.07 mm
November-7.4 °C7.2 °C10.41 mm
December-12.8 °C0.9 °C7.62 mm
Annual-1 °C15.2 °C244.86 mm

Climate Data for Johnstown Wyoming

Average First Frost DateSep. 21 - Sep. 30
Average Last Frost DateMay 21 - May 31
Average Days With FrostOver 180 Days
Plant Hardiness Zone - 2023Zone 5a : -28.9°C to -26.1°C
Plant Hardiness Zone - 2012Zone 4b : -31.7°C to -28.9°C
Current Drought ConditionsNormal
Köppen Climate ClassificationBSk - Cold Semi-Arid Climate
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