Twin Falls County Climate
Twin Falls County, Idaho
NOAA NCEI 1991-2020 Climate NormalsAvg Annual Temp
49.6°F
Annual Precip
10.2"
Annual Snowfall
24.2"
Extreme Heat Days
35
days >= 90°F/yr
Monthly Temperature
Precipitation Calendar
Growing Season & Gardening
6b
Minimum winter temperature range for plant survival
2,546
Supports most vegetables & fruits
Seasonal Overview
National Comparison
7-Day Outlook
Forecast
Current Conditions
Air Quality
Safety
Weather Alerts
Climate Advisory: Twin Falls County
Climate Verdict
Twin Falls County has a cool, averaging 49.6°F annually, arid conditions receiving just 10.2 inches of precipitation annually, occasional hot days — 35.28 per year above 90°F, moderate snowfall of 24.2 inches annually. This climate profile shapes everything from energy costs to outdoor recreation opportunities.
Seasonal Breakdown
Winters are cold, with January averaging 29.4°F. summers are warm — July averages 72.8°F. The 43°F seasonal variation provides noticeable but manageable change. December is typically the coldest month and July the warmest.
Outdoor & Gardening Guidance
Growing season and gardening data is currently limited for Twin Falls County. Check the USDA Plant Hardiness Zone Map and local extension office for specific guidance.
Regional Context
Twin Falls County is 3.0°F warmer than the Idaho statewide average of 46.5°F, it is also noticeably drier, receiving 6.8 inches less precipitation than the state average.
Climate Profile
About Twin Falls County Weather
A Classic High Desert Climate
Twin Falls averages 49.6°F annually, which is roughly four degrees cooler than the national median. The region features the dry air and clear skies typical of the Intermountain West.
Warmer Than the Idaho Average
At 49.6°F, this county is warmer than the Idaho state average of 46.5°F. It ranks as a relatively temperate zone compared to the state's mountainous northern reaches.
Dry Skies Over the Magic Valley
The county receives only 10.2 inches of annual precipitation, far less than the Idaho average of 17.0 inches. This aridity distinguishes it from the wetter counties in the panhandle.
Hot Summers and Snowy Winters
Summer brings 35 days of heat at or above 90°F, centered around a 72.8°F July average. Winter stays cold enough for 24.2 inches of annual snowfall.
Plan for Aridity and Heat
Efficient air conditioning is vital for the five weeks of extreme summer heat. Gardeners should prioritize xeriscaping to manage the low 10.2-inch annual rainfall.
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.