Gallatin County Climate
Gallatin County, Montana
Avg Annual Temp
41.2°F
Annual Precip
19.3"
Annual Snowfall
96.6"
Extreme Heat Days
12.7875
days >= 90°F/yr
Monthly Temperature
Precipitation Calendar
Seasonal Overview
National Comparison
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.
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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.