Cassia County Climate
Cassia County, Idaho
Avg Annual Temp
48.2°F
Annual Precip
10.7"
Annual Snowfall
18.5"
Extreme Heat Days
33.1
days >= 90°F/yr
Monthly Temperature
Precipitation Calendar
Seasonal Overview
National Comparison
Climate Profile
About Cassia County Weather
A Mild but Very Dry Climate
Cassia County averages 48.2°F annually, which is warmer than many of its Idaho peers. However, it is exceptionally dry, receiving just 10.7 inches of precipitation per year.
Warmer and Drier Than the State Average
At 48.2°F, Cassia is 1.7 degrees warmer than the Idaho state average. Its precipitation levels are significantly lower than the state's 17.0-inch average, totaling only 10.7 inches.
Warmer and Drier than Bonneville County
Cassia County is much warmer than Bonneville County, with an annual average of 48.2°F versus 43.8°F. It is also significantly drier, receiving only 18.5 inches of snow compared to Bonneville's 65.7.
Hot Summers and Manageable Winters
The county experiences 33 days above 90°F, with a July average of 70.3°F. Winters are relatively mild for Idaho, with an average temperature of 30.0°F and only 18.5 inches of snow.
Essential Cooling and Water Management
With 33 days of extreme heat, reliable air conditioning is a necessity for residents. The low 10.7 inches of precipitation requires drought-resistant landscaping and efficient agricultural irrigation.
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.