Gallatin County Climate
Gallatin County, Montana
NOAA NCEI 1991-2020 Climate NormalsAvg Annual Temp
41.2°F
Annual Precip
19.3"
Annual Snowfall
96.6"
Extreme Heat Days
13
days >= 90°F/yr
Monthly Temperature
Precipitation Calendar
Growing Season & Gardening
5a
Minimum winter temperature range for plant survival
1,411
Limited to cold-tolerant varieties
Seasonal Overview
National Comparison
7-Day Outlook
Forecast
Current Conditions
Air Quality
Safety
Weather Alerts
Climate Advisory: Gallatin County
Climate Verdict
Gallatin County has a cool, averaging 41.2°F annually, semi-arid conditions with only 19.3 inches of annual precipitation, rare extreme heat with only 12.787500000000001 days above 90°F annually, heavy winter snowfall averaging 96.6 inches per year. This climate profile shapes everything from energy costs to outdoor recreation opportunities.
Seasonal Breakdown
Winters are very cold — January averages 20.3°F. summers are pleasantly cool with July averaging 64.7°F. The 44°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
Gallatin County closely matches the Montana statewide average temperature of 43.7°F, it is somewhat wetter than average for Montana.
Climate Profile
About Gallatin County Weather
High altitude and heavy snow
Gallatin County is a cold, high-elevation region with an annual average temperature of 41.2°F. It is famous for its 96.6 inches of annual snowfall, which ranks it among the snowiest populated counties in the nation.
Cold and snowy state leader
Gallatin is 2.5°F colder than the Montana average and receives significantly more precipitation at 19.3 inches. Its 96.6 inches of snow is nearly triple the amount seen in eastern Montana counties like Fallon.
Snowier than its mountain peers
Gallatin’s 96.6 inches of snow dwarfs the 70.8 inches found in Flathead County. It is also nearly 3 degrees colder on average than Deer Lodge County, reflecting its higher mountain basins.
Brief summers and long winters
July averages a cool 64.7°F with only 13 days of extreme heat. The winter season is long and intense, with a 21.1°F average from December to February and almost 100 inches of snow.
Total winter preparation
Residents must have professional-grade snow removal equipment and mountain-rated winter tires. Home heating systems should be robust enough to handle the 20.3°F January average and the heavy, persistent snowpack.
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.