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Thermopolis (WY) Weather and Climate: A Comprehensive Guide

The climate in Thermopolis is marked by big temperature swings throughout the year. Temperatures range from very warm during the warmest months to very cold in the cooler months. It's weather is marked by below-average rain/snowfall. Let’s explore the climate details in depth to provide you with a complete overview.

Average maximum day and minimum night temperature

In Thermopolis, temperatures differ significantly between summer and winter months. Typically, average maximum daytime temperatures range from a very warm 33°C in July to a very cold 1°C in the coolest month, December.

Nights are cooler, with lows often dropping to around -13°C during the colder months. Check out our detailed temperature page for more information.

Temperature ranges by month

Precipitation and rainy days

Thermopolis's climate is marked by below-average rain/snowfall, accumulating 313 mm of precipitation yearly. The climate in Thermopolis shows significant variation throughout the year. Expect moderate rainfall in May, with an average of 77 mm of precipitation over 12 rainy days.

In contrast, January offers drier and sunnier days, with around 8.6 mm of snowfall over 5 snowy days. For more details, please visit our Thermopolis Precipitation page.

The mean monthly precipitation over the year, including rain, hail and snow

Forecast for Thermopolis (WY)

Sun   Dec 22
9°C | -1°C
NW 4 m/s
partly cloudy and no rain

partly cloudy and no rain

Mon   Dec 23
4°C | -3°C
SW 1 m/s
0.7 mm
overcast and small chance of slight snow

overcast and small chance of slight snow

Tue   Dec 24
5°C | -3°C
S 3 m/s
broken clouds and no rain

broken clouds and no rain

The best time of year to visit Thermopolis in the United States of America

During the months of May and September you are most likely to experience good weather with pleasant average temperatures that fall between 20°C and 26°C.

Other facts from our historical weather data:
  • When is summer in Thermopolis?
    The hottest season / summer takes place in June, July, August and September.
  • Does Thermopolis have a dry season?
    Yes, the months of January, February, July, August, November and December are very dry.
  • Which is the warmest month in Thermopolis?
    July has an average maximum temperature of 33°C and is the warmest month of the year.
  • Which is the coldest month in Thermopolis?
    The coldest month is December with an average maximum temperature of 1°C.
  • Which is the wettest month in Thermopolis?
    May tops the wettest month list with 77 mm of rainfall.
  • Which is the driest month in Thermopolis?
    January is the driest month with 9 mm of precipitation.

  • No idea where to travel to this year? We have a tool that recommends destinations based on your ideal conditions. Find out where to go with our weather planner.