Teton County Climate
Teton County, Montana
Avg Annual Temp
43.2°F
Annual Precip
12.2"
Annual Snowfall
47.5"
Extreme Heat Days
9.066666666666666
days >= 90°F/yr
Monthly Temperature
Precipitation Calendar
Seasonal Overview
National Comparison
Climate Profile
About Teton County Weather
A dry, high-latitude climate
Teton County records an average annual temperature of 43.2°F, placing it well below the national median for warmth. With only 12.1 inches of annual precipitation, the region is significantly drier than the average American county.
Slightly cooler than the state
At 43.2°F, Teton County sits just below the Montana state average of 43.7°F. Its 47.5 inches of annual snowfall is typical for the Rocky Mountain Front, providing steady moisture despite low overall rainfall.
Mild summers compared to the plains
Teton avoids the intense heat seen further east, recording only 9 days above 90°F per year. This is significantly fewer heat events than neighbor Toole County, which sees nearly 60% more extreme heat days.
Consistently cool across seasons
Summer averages stay cool at 62.0°F, while winters are cold with a December through February average of 25.4°F. January is the coldest stretch, with temperatures averaging 24.8°F.
Focus on moisture and insulation
The dry air and 12.1 inches of precipitation mean xeriscaping is a smart choice for local landscaping. Given the 47.5 inches of snow and cold winters, ensuring home insulation is up to modern standards will keep heating costs manageable.
Frequently Asked Questions
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Data source: NOAA National Centers for Environmental Information (NCEI), U.S. Climate Normals 1991-2020.
Climate normals are 30-year averages of weather variables computed from 1991 to 2020. Station data is aggregated to county level using spatial averaging. Data is informational only — not a substitute for official National Weather Service forecasts or emergency weather warnings.