Fallon County Climate
Fallon County, Montana
Avg Annual Temp
44.0°F
Annual Precip
15.0"
Annual Snowfall
34.2"
Extreme Heat Days
32.666666666666664
days >= 90°F/yr
Monthly Temperature
Precipitation Calendar
Seasonal Overview
National Comparison
Climate Profile
About Fallon County Weather
A balanced plains climate
Fallon County averages 44.0°F annually, placing it firmly in the cold-temperate zone of the American North. It receives 15.0 inches of precipitation, typical for the semi-arid grasslands of the Great Plains.
Right on the state average
With an average temperature of 44.0°F, Fallon sits just 0.3°F above the Montana state average. Its annual precipitation of 15.0 inches also closely mirrors the state average of 15.4 inches.
Cooler than the southern valley
Fallon is notably cooler than Dawson County (46.6°F) but much warmer than Daniels County (40.2°F). Its 34.2 inches of snowfall is higher than its immediate neighbors to the west and north.
Warm summers and snowy stretches
The county sees 33 days of 90°F heat, with July temperatures averaging a warm 71.2°F. Winters are cold and snowy, with 34.2 inches of accumulation and a winter average of 20.0°F.
Prepare for seasonal swings
Residents need versatile HVAC systems to handle both the 33 days of heat and the 20.0°F winter average. Sturdy winter clothing is essential for the 34.2 inches of snow that covers the plains annually.
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.