Sweet Grass County Climate
Sweet Grass County, Montana
NOAA NCEI 1991-2020 Climate NormalsAvg Annual Temp
43.7°F
Annual Precip
17.8"
Annual Snowfall
77.6"
Extreme Heat Days
15
days >= 90°F/yr
Monthly Temperature
Precipitation Calendar
Growing Season & Gardening
5a
Minimum winter temperature range for plant survival
1,628
Favors cool-season crops
Seasonal Overview
National Comparison
7-Day Outlook
Forecast
Current Conditions
Air Quality
Safety
Weather Alerts
Climate Advisory: Sweet Grass County
Climate Verdict
Sweet Grass County has a cool, averaging 43.7°F annually, semi-arid conditions with only 17.8 inches of annual precipitation, rare extreme heat with only 14.800000000000002 days above 90°F annually, heavy winter snowfall averaging 77.6 inches per year. This climate profile shapes everything from energy costs to outdoor recreation opportunities.
Seasonal Breakdown
Winters are cold, with January averaging 25.8°F. summers are pleasantly cool with July averaging 66.0°F. The 40°F seasonal variation provides noticeable but manageable change. December is typically the coldest month and July the warmest.
Outdoor & Gardening Guidance
Winter sports enthusiasts benefit from reliable snow cover for 3-4 months annually.
Regional Context
Sweet Grass County closely matches the Montana statewide average temperature of 43.7°F, it is somewhat wetter than average for Montana.
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.
Frequently Asked Questions
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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.