Sweet Grass County Climate
Sweet Grass County, Montana
Avg Annual Temp
43.7°F
Annual Precip
17.8"
Annual Snowfall
77.6"
Extreme Heat Days
14.800000000000002
days >= 90°F/yr
Monthly Temperature
Precipitation Calendar
Seasonal Overview
National Comparison
Climate Profile
About Sweet Grass County Weather
A snowy mountain climate
Sweet Grass County maintains an average annual temperature of 43.7°F, significantly cooler than the U.S. national median. This high-altitude environment receives 17.8 inches of annual precipitation, making it wetter than many of its semi-arid neighbors.
Meeting the Montana average
The county's 43.7°F annual temperature perfectly matches the Montana state average. While it tracks with the state for heat, its 77.6 inches of annual snowfall is nearly double that of several neighboring central counties.
Cooler summers than eastern neighbors
With a July average of 66.0°F, Sweet Grass stays much cooler than Yellowstone County to the east. It only experiences 15 days of extreme heat per year, offering a more temperate summer experience than the lower-elevation plains.
Brisk winters and heavy snow
Winter is defined by a 26.0°F average and substantial snowfall accumulating to over 77 inches annually. Summers are mild and brief, with average temperatures hovering around 63.0°F during the peak months of June through August.
Prepare for serious winter travel
Residents should prioritize high-performance winter tires and heavy-duty snow removal equipment to manage the significant 77.6-inch seasonal accumulation. While summer heat is rare, well-insulated homes are essential to combat the sub-freezing January nights that average 25.8°F.
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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.