Lewis County Climate
Lewis County, Idaho
NOAA NCEI 1991-2020 Climate NormalsAvg Annual Temp
46.8°F
Annual Precip
21.9"
Annual Snowfall
42.2"
Extreme Heat Days
24
days >= 90°F/yr
Monthly Temperature
Precipitation Calendar
Growing Season & Gardening
6b
Minimum winter temperature range for plant survival
1,800
Favors cool-season crops
Seasonal Overview
National Comparison
7-Day Outlook
Forecast
Current Conditions
Air Quality
Safety
Weather Alerts
Climate Advisory: Lewis County
Climate Verdict
Lewis County has a cool, averaging 46.8°F annually, semi-arid conditions with only 21.9 inches of annual precipitation, occasional hot days — 23.933333333333334 per year above 90°F, moderate snowfall of 42.2 inches annually. This climate profile shapes everything from energy costs to outdoor recreation opportunities.
Seasonal Breakdown
Winters are cold, with January averaging 30.1°F. summers are pleasantly cool with July averaging 66.2°F. The 36°F seasonal variation provides noticeable but manageable change. December is typically the coldest month and August the warmest.
Outdoor & Gardening Guidance
Winter sports enthusiasts benefit from reliable snow cover for 3-4 months annually.
Regional Context
Lewis County closely matches the Idaho statewide average temperature of 46.5°F, it is somewhat wetter than average for Idaho.
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
What is the average temperature in Lewis County?
How much rain does Lewis County get?
Does it snow in Lewis County?
How hot does Lewis County get in summer?
How cold are winters in Lewis County?
Track your own weather in Lewis County
Ambient Weather personal weather stations give you hyperlocal climate data.
Sponsored
Data sources: NOAA National Centers for Environmental Information (NCEI), U.S. Climate Normals 1991-2020. Forecast and alert data from National Weather Service API. Air quality data from Open-Meteo.
Climate normals are 30-year averages of weather variables. Station data is aggregated to county level. Forecasts and alerts are fetched live and may change frequently. Data is informational only — not a substitute for official National Weather Service forecasts or emergency weather warnings.