Boise County Climate
Boise County, Idaho
NOAA NCEI 1991-2020 Climate NormalsAvg Annual Temp
45.0°F
Annual Precip
25.3"
Annual Snowfall
93.1"
Extreme Heat Days
33
days >= 90°F/yr
Monthly Temperature
Precipitation Calendar
Growing Season & Gardening
6b
Minimum winter temperature range for plant survival
1,692
Favors cool-season crops
Seasonal Overview
National Comparison
7-Day Outlook
Forecast
Current Conditions
Air Quality
Safety
Weather Alerts
Climate Advisory: Boise County
Climate Verdict
Boise County has a cool, averaging 45.0°F annually, moderate rainfall of 25.3 inches per year, occasional hot days — 33.300000000000004 per year above 90°F, heavy winter snowfall averaging 93.1 inches per year. This climate profile shapes everything from energy costs to outdoor recreation opportunities.
Seasonal Breakdown
Winters are cold, with January averaging 25.2°F. summers are pleasantly cool with July averaging 66.8°F. The 42°F seasonal variation provides noticeable but manageable change. December is typically the coldest month and July the warmest.
Outdoor & Gardening Guidance
Winter sports enthusiasts benefit from reliable snow cover for 3-4 months annually.
Regional Context
Boise County closely matches the Idaho statewide average temperature of 46.5°F, it is also noticeably wetter, receiving 8.3 inches more precipitation than the state average.
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
What is the average temperature in Boise County?
How much rain does Boise County get?
Does it snow in Boise County?
How hot does Boise County get in summer?
How cold are winters in Boise County?
Track your own weather in Boise 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.