Valley County Climate
Valley County, Montana
Avg Annual Temp
41.8°F
Annual Precip
13.8"
Annual Snowfall
34.4"
Extreme Heat Days
23.185714285714287
days >= 90°F/yr
Monthly Temperature
Precipitation Calendar
Seasonal Overview
National Comparison
Climate Profile
About Valley County Weather
Extreme seasonal temperature swings
Valley County has a low average annual temperature of 41.8°F, reflecting its northern latitude and distance from moderating oceans. It is a dry region, receiving just 13.8 inches of annual precipitation.
Montana's cold winter champion
The county is colder than the state average of 43.7°F, largely due to its brutal winter months. January averages a frigid 13.3°F, making it one of the coldest inhabited places in the state.
Hotter and colder than the west
Valley County sees 23 days of extreme heat, which is far more than Teton's 9 days. However, its winter average of 15.7°F is significantly harsher than the more moderate 26.0°F seen in Sweet Grass County.
From deep freeze to high heat
Winters are extreme, with an average temperature of just 15.7°F and 34.4 inches of snow. Summers are surprisingly warm, averaging 66.7°F with July peaks hitting 69.4°F.
Gear up for extreme cold
Robust home heating and vehicle block heaters are essential for the 13.3°F January lows. While snowfall is moderate at 34.4 inches, the wind and extreme cold make winter preparedness the primary concern for residents.
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.