Stillwater County Climate
Stillwater County, Montana
NOAA NCEI 1991-2020 Climate NormalsAvg Annual Temp
44.0°F
Annual Precip
18.7"
Annual Snowfall
87.3"
Extreme Heat Days
19
days >= 90°F/yr
Monthly Temperature
Precipitation Calendar
Growing Season & Gardening
5a
Minimum winter temperature range for plant survival
1,635
Favors cool-season crops
Seasonal Overview
National Comparison
7-Day Outlook
Forecast
Current Conditions
Air Quality
Safety
Weather Alerts
Climate Advisory: Stillwater County
Climate Verdict
Stillwater County has a cool, averaging 44.0°F annually, semi-arid conditions with only 18.7 inches of annual precipitation, rare extreme heat with only 19.45 days above 90°F annually, heavy winter snowfall averaging 87.3 inches per year. This climate profile shapes everything from energy costs to outdoor recreation opportunities.
Seasonal Breakdown
Winters are cold, with January averaging 26.1°F. summers are pleasantly cool with July averaging 65.9°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
Stillwater County closely matches the Montana statewide average temperature of 43.7°F, it is somewhat wetter than average for Montana.
Climate Profile
About Stillwater County Weather
Average Temperatures, Extraordinary Snowfall
Stillwater County’s 44.0°F annual average is typical for the region, but its moisture patterns are unique. The county faces a heavy seasonal snow load compared to much of the United States.
Matching the Montana Temperature Baseline
Stillwater’s 44.0°F annual average is nearly identical to the Montana state average of 43.7°F. However, its 18.7 inches of precipitation makes it wetter than many other parts of the state.
A Regional Leader in Heavy Snow
While neighboring counties might see moderate totals, Stillwater gets buried under 87.3 inches of annual snowfall. This is nearly triple the snowfall seen in eastern Montana counties like Richland.
Mountain Winters and Gentle Summers
July averages a pleasant 65.9°F, while winter is defined by the massive 87.3-inch snow total. January temperatures stay relatively mild for the state at 26.1°F, despite the heavy precipitation.
Serious Snow Prep is Mandatory
With over 87 inches of snow per year, residents need professional-grade snow blowers and structural roof considerations. While 19 days of extreme heat occur, the primary planning focus should remain on winter moisture management.
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.