Cassia County Climate
Cassia County, Idaho
NOAA NCEI 1991-2020 Climate NormalsAvg Annual Temp
48.2°F
Annual Precip
10.7"
Annual Snowfall
18.5"
Extreme Heat Days
33
days >= 90°F/yr
Monthly Temperature
Precipitation Calendar
Growing Season & Gardening
6b
Minimum winter temperature range for plant survival
2,218
Favors cool-season crops
Seasonal Overview
National Comparison
7-Day Outlook
Forecast
Current Conditions
Air Quality
Safety
Weather Alerts
Climate Advisory: Cassia County
Climate Verdict
Cassia County has a cool, averaging 48.2°F annually, arid conditions receiving just 10.7 inches of precipitation annually, occasional hot days — 33.1 per year above 90°F, light snow averaging 18.5 inches per year. This climate profile shapes everything from energy costs to outdoor recreation opportunities.
Seasonal Breakdown
Winters are cold, with January averaging 28.6°F. summers are warm — July averages 70.3°F. The 42°F seasonal variation provides noticeable but manageable change.
Outdoor & Gardening Guidance
Growing season and gardening data is currently limited for Cassia County. Check the USDA Plant Hardiness Zone Map and local extension office for specific guidance.
Regional Context
Cassia County closely matches the Idaho statewide average temperature of 46.5°F, it is also noticeably drier, receiving 6.3 inches less precipitation than the state average.
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 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.