Thermopolis Wyoming Climate Data

Monthly Average Climate Data for Thermopolis Wyoming

Switch Data to Fahrenheit
MonthAvg. LowAvg. HighAvg. Precip
January-14 °C1.7 °C9.65 mm
February-11.3 °C4.2 °C11.94 mm
March-5.3 °C11.3 °C24.13 mm
April-0.6 °C15.8 °C42.42 mm
May4.7 °C21.1 °C67.06 mm
June9.1 °C27.4 °C36.83 mm
July12.8 °C32.4 °C18.29 mm
August11.3 °C31.6 °C14.22 mm
September6.1 °C25.8 °C33.02 mm
October-0.4 °C17.3 °C34.04 mm
November-7.6 °C8.3 °C14.99 mm
December-12.8 °C2.1 °C14.48 mm
Annual-0.7 °C16.6 °C321.07 mm

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 : -28.9°C to -26.1°C
Plant Hardiness Zone - 2012Zone 4b : -31.7°C to -28.9°C
Current Drought ConditionsNormal
Köppen Climate ClassificationBWk - Cold Desert Climate