Idaho County Climate
Idaho County, Idaho
Avg Annual Temp
44.8°F
Annual Precip
28.8"
Annual Snowfall
52.4"
Extreme Heat Days
23.776923076923076
days >= 90°F/yr
Monthly Temperature
Precipitation Calendar
Seasonal Overview
National Comparison
Climate Profile
About Idaho County Weather
A vast, cool, and wet mountain landscape
Idaho County averages a cool 44.8°F, placing it significantly below the national median temperature. While much of the interior West is arid, this county receives a robust 28.8 inches of annual precipitation.
Cooler than the Gem State average
The county's 44.8°F annual average is nearly two degrees cooler than the Idaho state average of 46.5°F. This temperature gap reflects the high-elevation, rugged terrain that defines much of its 8,500 square miles.
Wetter than its Eastern neighbors
Compared to Jefferson County's 11.2 inches of rain, Idaho County is a regional anomaly with 28.8 inches of annual precipitation. It shares a similar average temperature with Jefferson but experiences a much more humid environment.
Deep snow and moderate summers
Winters are defined by a substantial 52.4 inches of annual snowfall and January averages of 27.2°F. Summers remain mild with a July average of 65.8°F, though residents still face 24 days of heat over 90°F annually.
Prepare for snow and mountain rain
Residents should invest in heavy-duty snow removal equipment to manage the 50-plus inches of annual accumulation. High-quality waterproof gear and reliable home insulation are essential for the damp, cool climate.
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.