Johnstown Wyoming Climate Data

Monthly Average Climate Data for Johnstown Wyoming

Switch Data to Celsius/Metric Units
MonthAvg. LowAvg. HighAvg. Precip
January7.7 °F33.7 °F0.3 in.
February11.3 °F38.1 °F0.36 in.
March22.0 °F49.8 °F0.64 in.
April29.7 °F57.5 °F1.4 in.
May38.9 °F66.8 °F2.22 in.
June46.8 °F78.2 °F1.09 in.
July53.7 °F87.8 °F0.66 in.
August51.5 °F85.8 °F0.57 in.
September42.9 °F75.0 °F0.9 in.
October31.4 °F60.3 °F0.79 in.
November18.7 °F45.0 °F0.41 in.
December9.0 °F33.7 °F0.3 in.
Annual30.3 °F59.3 °F9.64 in.

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 : -20°F to -15°F
Plant Hardiness Zone - 2012Zone 4b : -25°F to -20°F
Current Drought ConditionsNormal
Köppen Climate ClassificationBSk - Cold Semi-Arid Climate