Granite County Climate
Granite County, Montana
Avg Annual Temp
42.5°F
Annual Precip
14.3"
Annual Snowfall
30.5"
Extreme Heat Days
15
days >= 90°F/yr
Monthly Temperature
Precipitation Calendar
Seasonal Overview
National Comparison
Climate Profile
About Granite County Weather
A cool and dry mountain climate
Granite County records an annual average temperature of 42.5°F, staying well below the national average. The 14.3 inches of annual precipitation reflect a dry environment common to the western interior.
Just below the Montana state average
Granite County is slightly cooler than the state average of 43.7°F, coming in at 42.5°F. This reflects its position within the higher elevations of western Montana.
Comparable to Jefferson and Lake counties
The county's 42.5°F average is nearly identical to Jefferson County's 42.6°F. However, it is significantly cooler than Lake County, which enjoys a warmer 45.9°F average.
Balanced seasons with moderate snowfall
Winters are cold but manageable with a 24.2°F January average and 30.5 inches of snow. Summers are pleasant and mild, with only 15 days exceeding 90°F and a July average of 63.7°F.
Prioritize winter gear over summer cooling
With only 15 extreme heat days, high-end cooling is less critical than in other parts of the state. Residents should focus on winterizing homes for the 30 inches of snow and sub-freezing winter averages.
Frequently Asked Questions
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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.