Bonneville County Climate
Bonneville County, Idaho
NOAA NCEI 1991-2020 Climate NormalsAvg Annual Temp
43.8°F
Annual Precip
15.2"
Annual Snowfall
65.7"
Extreme Heat Days
18
days >= 90°F/yr
Monthly Temperature
Precipitation Calendar
Growing Season & Gardening
5b
Minimum winter temperature range for plant survival
1,758
Favors cool-season crops
Seasonal Overview
National Comparison
7-Day Outlook
Forecast
Current Conditions
Air Quality
Safety
Weather Alerts
Climate Advisory: Bonneville County
Climate Verdict
Bonneville County has a cool, averaging 43.8°F annually, semi-arid conditions with only 15.2 inches of annual precipitation, rare extreme heat with only 18.4 days above 90°F annually, heavy winter snowfall averaging 65.7 inches per year. This climate profile shapes everything from energy costs to outdoor recreation opportunities.
Seasonal Breakdown
Winters are very cold — January averages 21.6°F. summers are pleasantly cool with July averaging 67.3°F. The 46°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
Bonneville County closely matches the Idaho statewide average temperature of 46.5°F.
Climate Profile
About Bonneville County Weather
High Altitude and Cold Average Temperatures
Bonneville County maintains an average annual temperature of 43.8°F, placing it well below the national median. This reflects its high-elevation position within the Rocky Mountains.
One of Idaho's Colder Inhabited Counties
The county's average temperature of 43.8°F is nearly three degrees colder than the Idaho state average of 46.5°F. Annual precipitation is 15.2 inches, slightly drier than the 17.0-inch state mark.
Similar to Southern Neighbors in Precipitation
Bonneville County shares a similar arid profile with Caribou County, receiving 15.2 inches of moisture compared to Caribou's 15.4 inches. However, Bonneville sees more extreme snow with 65.7 inches annually.
Freezing Winters and Moderate Heat
Winter is intense here, with an average winter temperature of 23.1°F and over 65 inches of snow. July highs average 67.3°F, though the county experiences 18 days of heat above 90°F annually.
Winter Gear and Moderate Cooling Needs
With 65.7 inches of snow, heavy-duty winter tires and high-quality insulation are non-negotiable for residents. The 18 extreme heat days suggest that central air or efficient window units are necessary for summer comfort.
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.