Missoula County Climate
Missoula County, Montana
Avg Annual Temp
43.5°F
Annual Precip
18.0"
Annual Snowfall
73.9"
Extreme Heat Days
18.25
days >= 90°F/yr
Monthly Temperature
Precipitation Calendar
Seasonal Overview
National Comparison
Climate Profile
About Missoula County Weather
A Classic Northern Rockies Profile
Missoula County's 43.4°F annual average is typical for high-latitude mountain valleys but cold compared to the 54°F national median. The county receives 18.0 inches of precipitation, indicating a moderately moist climate.
Aligning With the Montana Median
The county's average temperature of 43.4°F sits right next to the state average of 43.7°F. However, its 73.9 inches of annual snowfall is significantly higher than many other populated Montana valleys.
Snowier Than Its Eastern Neighbors
Missoula receives 73.9 inches of snow, more than double the 32.6 inches recorded in Lewis and Clark County. Despite the snow, the two counties share similar average July temperatures around 66°F.
Heavy Snow Cycles and Warm Julys
Winter is snowy and persistent, with a January average of 23.8°F and 73.9 total inches of fall. July is pleasant at 66°F, though 18 days of 90°F heat provide a significant summer peak.
Prioritize Snow Removal and Insulation
Robust snow removal tools are a necessity for the heavy 73.9-inch annual snowfall. Residents should also plan for moderate summer cooling to offset the nearly three weeks of extreme 90°F heat.
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.