Boise County Climate
Boise County, Idaho
Avg Annual Temp
45.0°F
Annual Precip
25.3"
Annual Snowfall
93.0"
Extreme Heat Days
33.300000000000004
days >= 90°F/yr
Monthly Temperature
Precipitation Calendar
Seasonal Overview
National Comparison
Climate Profile
About Boise County Weather
High precipitation and cool temperatures
Boise County's 45.0°F average annual temperature is cooler than the national median. However, its 25.3 inches of annual precipitation is higher than many Western interior counties.
Slightly cooler and wetter than average
The county sits just below the Idaho average of 46.5°F but is much wetter than the state average of 17.0 inches. This results in heavy mountain snowpacks that feed the state's river systems.
The snow capital of the region
Boise County averages a massive 93.1 inches of snow, nearly triple that of neighboring Ada County. It also receives nearly twice the annual precipitation of its valley neighbors.
Extreme snowfall and moderate heat
The county is defined by its 93.1 inches of annual snow and a chilly January average of 25.2°F. Despite the snow, it still sees 33 days of heat over 90°F in the summer canyon depths.
Prepare for serious winter accumulation
Metal roofing and snow rakes are common needs for handling over 90 inches of annual snow. Residents should keep emergency supplies for potential winter road isolation when temperatures hit 26.6°F.
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.