Nez Perce County Climate
Nez Perce County, Idaho
Avg Annual Temp
53.8°F
Annual Precip
12.9"
Annual Snowfall
12.7"
Extreme Heat Days
44.1
days >= 90°F/yr
Monthly Temperature
Precipitation Calendar
Seasonal Overview
National Comparison
Climate Profile
About Nez Perce County Weather
A Warm Interior Northwest Hub
With an average of 53.8°F, Nez Perce is one of the warmest spots in the Pacific Northwest interior. Its dry climate yields only 12.9 inches of annual precipitation.
Idaho's Famous Banana Belt
This is one of Idaho's warmest counties, far exceeding the state average of 46.5°F. The local geography keeps the Lewiston area significantly milder than the rest of the state.
Warmer and Drier Than Neighbors
It is much warmer than surrounding mountain counties like Clearwater and Shoshone. While it stays dry, its 12.7 inches of snow is minimal compared to its high-altitude neighbors.
Intense Heat and Mild Winters
Summers are intense with 44 days reaching 90°F and a July average of 75.8°F. Winters are the mildest in the state, averaging a relatively warm 36.9°F.
Cooling is the Top Priority
Modern air conditioning is essential to navigate the frequent 90-degree summer days. Light winter layers usually suffice as January averages stay well above freezing at 36.2°F.
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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.