Thermopolis Wyoming Climate Data

Monthly Average Climate Data for Thermopolis Wyoming

Switch Data to Celsius/Metric Units
MonthAvg. LowAvg. HighAvg. Precip
January6.8 °F35.0 °F0.38 in.
February11.7 °F39.5 °F0.47 in.
March22.5 °F52.3 °F0.95 in.
April30.9 °F60.5 °F1.67 in.
May40.5 °F69.9 °F2.64 in.
June48.4 °F81.4 °F1.45 in.
July55.1 °F90.4 °F0.72 in.
August52.3 °F88.9 °F0.56 in.
September42.9 °F78.4 °F1.3 in.
October31.2 °F63.1 °F1.34 in.
November18.4 °F46.9 °F0.59 in.
December9.0 °F35.7 °F0.57 in.
Annual30.8 °F61.8 °F12.64 in.

Climate Data for Thermopolis Wyoming

Average First Frost DateOct. 1 - Oct. 10
Average Last Frost DateMay 21 - May 31
Average Days With Frost150-180 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 ClassificationBWk - Cold Desert Climate