Lewis and Clark County Climate
Lewis and Clark County, Montana
Avg Annual Temp
43.3°F
Annual Precip
15.6"
Annual Snowfall
32.6"
Extreme Heat Days
14.928571428571429
days >= 90°F/yr
Monthly Temperature
Precipitation Calendar
Seasonal Overview
National Comparison
Climate Profile
About Lewis and Clark County Weather
A Cool Continental Climate in the Rockies
Lewis and Clark County maintains an annual average temperature of 43.3°F, significantly cooler than the national county median of roughly 54°F. This semi-arid region experiences dry air and sharp temperature shifts typical of high-elevation mountain environments.
Matching the Montana State Average
The county's average temperature sits just below the Montana state average of 43.7°F. With 15.6 inches of annual precipitation, it aligns closely with the state's typical moisture levels of 15.4 inches.
Warmer and Drier Than High-Altitude Neighbors
At 43.3°F, the county is notably warmer than neighboring Meagher County, which averages only 41.4°F. It also sees far less snow than nearby Missoula County, recording 32.6 inches compared to Missoula's 73.9 inches.
Moderate Summers Meet Sharp Winter Chills
July brings a pleasant average of 65.7°F, though residents face 15 extreme heat days over 90°F annually. Winters are brisk with a January average of 24.7°F and reliable, though not overwhelming, snowfall.
Preparing for Arid Extremes and Elevation
Homeowners should prioritize efficient heating systems for the 25.2°F winter average and consider moderate cooling for the two weeks of summer heat. Given the 15.6 inches of precipitation, water-wise landscaping is essential for local gardens.
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.