Boundary County Climate
Boundary County, Idaho
NOAA NCEI 1991-2020 Climate NormalsAvg Annual Temp
47.5°F
Annual Precip
21.3"
Annual Snowfall
53.8"
Extreme Heat Days
20
days >= 90°F/yr
Monthly Temperature
Precipitation Calendar
Growing Season & Gardening
6b
Minimum winter temperature range for plant survival
2,048
Favors cool-season crops
Seasonal Overview
National Comparison
7-Day Outlook
Forecast
Current Conditions
Air Quality
Safety
Weather Alerts
Climate Advisory: Boundary County
Climate Verdict
Boundary County has a cool, averaging 47.5°F annually, semi-arid conditions with only 21.3 inches of annual precipitation, occasional hot days — 20.45 per year above 90°F, moderate snowfall of 53.8 inches annually. This climate profile shapes everything from energy costs to outdoor recreation opportunities.
Seasonal Breakdown
Winters are cold, with January averaging 28.4°F. summers are pleasantly cool with July averaging 68.9°F. The 40°F seasonal variation provides noticeable but manageable change.
Outdoor & Gardening Guidance
Winter sports enthusiasts benefit from reliable snow cover for 3-4 months annually.
Regional Context
Boundary County closely matches the Idaho statewide average temperature of 46.5°F, it is somewhat wetter than average for Idaho.
Climate Profile
About Boundary County Weather
Moderate Temperatures on the Canadian Border
Boundary County averages 47.5°F annually, which is surprisingly mild for its northern latitude compared to the national median. It receives 21.3 inches of precipitation, making it more humid than the typical Western interior.
Above Idaho's Average Annual Temperature
The county's annual average of 47.5°F is higher than the Idaho state average of 46.5°F. It also receives 4.3 inches more precipitation than the typical Idaho county.
Drier and Warmer Than Bonner County
Boundary County is notably drier than its neighbor Bonner, receiving 21.3 inches of precipitation compared to Bonner's 32.4. It also enjoys a warmer July average of 68.9°F versus Bonner's 66.1°F.
Crisp Winters and Brief Heat Waves
The county sees 53.8 inches of snow annually, with winter temperatures averaging 29.4°F. Summer peaks in July at 68.9°F, and residents should expect about 20 days per year over 90°F.
Year-Round Outdoor Planning Essentials
While snowfall is moderate for Idaho at 53.8 inches, residents should still prioritize reliable heating systems. The 20 extreme heat days mean that while summers are mild, cooling solutions are becoming increasingly relevant.
Frequently Asked Questions
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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.