Bonneville County Climate
Bonneville County, Idaho
Avg Annual Temp
43.8°F
Annual Precip
15.2"
Annual Snowfall
65.7"
Extreme Heat Days
18.4
days >= 90°F/yr
Monthly Temperature
Precipitation Calendar
Seasonal Overview
National Comparison
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 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.