Lewis County Climate
Lewis County, Idaho
Avg Annual Temp
46.8°F
Annual Precip
21.9"
Annual Snowfall
42.2"
Extreme Heat Days
23.933333333333337
days >= 90°F/yr
Monthly Temperature
Precipitation Calendar
Seasonal Overview
National Comparison
Climate Profile
About Lewis County Weather
A snowy, moderate northern climate
Lewis County averages 46.8°F, which is slightly cooler than the national median but mild for the Idaho panhandle. It receives 21.9 inches of annual precipitation, making it moderately wet.
Just above the Idaho state average
At 46.8°F, Lewis County is slightly warmer than the Idaho statewide average of 46.5°F. Its 21.9 inches of precipitation sits about 5 inches higher than the state average of 17.0 inches.
Warmer and wetter than Jefferson
Lewis County is two degrees warmer and twice as wet as Jefferson County. It also sees double the snowfall of Jefferson, with 42.2 inches compared to 20.4 inches.
High snowfall and consistent heat
The county averages 42.2 inches of snow per year, with January temperatures hovering around 30.1°F. Summers bring a July average of 66.2°F and 24 days of temperatures hitting 90°F or higher.
Manage moisture and winter snow
With over 40 inches of snow, residents need effective plowing solutions and sturdy roofing. The combination of 21.9 inches of rain and moderate summer heat makes moisture-resistant building materials a wise investment.
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.