Fallon County Climate
Fallon County, Montana
NOAA NCEI 1991-2020 Climate NormalsAvg Annual Temp
44.0°F
Annual Precip
15.0"
Annual Snowfall
34.2"
Extreme Heat Days
33
days >= 90°F/yr
Monthly Temperature
Precipitation Calendar
Growing Season & Gardening
4b
Minimum winter temperature range for plant survival
2,253
Favors cool-season crops
Seasonal Overview
National Comparison
7-Day Outlook
Forecast
Current Conditions
Air Quality
Safety
Weather Alerts
Climate Advisory: Fallon County
Climate Verdict
Fallon County has a cool, averaging 44.0°F annually, semi-arid conditions with only 15.0 inches of annual precipitation, occasional hot days — 32.666666666666664 per year above 90°F, moderate snowfall of 34.2 inches annually. This climate profile shapes everything from energy costs to outdoor recreation opportunities.
Seasonal Breakdown
Winters are very cold — January averages 17.9°F. summers are warm — July averages 71.2°F. Residents experience a substantial 53°F difference between winter and summer.
Outdoor & Gardening Guidance
Growing season and gardening data is currently limited for Fallon County. Check the USDA Plant Hardiness Zone Map and local extension office for specific guidance.
Regional Context
Fallon County closely matches the Montana statewide average temperature of 43.7°F.
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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Track your own weather in Fallon County
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Data sources: NOAA National Centers for Environmental Information (NCEI), U.S. Climate Normals 1991-2020. Forecast and alert data from National Weather Service API. Air quality data from Open-Meteo.
Climate normals are 30-year averages of weather variables. Station data is aggregated to county level. Forecasts and alerts are fetched live and may change frequently. Data is informational only — not a substitute for official National Weather Service forecasts or emergency weather warnings.