Jerome County Climate
Jerome County, Idaho
NOAA NCEI 1991-2020 Climate NormalsAvg Annual Temp
49.6°F
Annual Precip
10.4"
Annual Snowfall
—
Extreme Heat Days
43
days >= 90°F/yr
Monthly Temperature
Precipitation Calendar
Growing Season & Gardening
6b
Minimum winter temperature range for plant survival
2,650
Supports most vegetables & fruits
Seasonal Overview
National Comparison
7-Day Outlook
Forecast
Current Conditions
Air Quality
Safety
Weather Alerts
Climate Advisory: Jerome County
Climate Verdict
Jerome County has a cool, averaging 49.6°F annually, arid conditions receiving just 10.4 inches of precipitation annually, occasional hot days — 43.366666666666674 per year above 90°F. This climate profile shapes everything from energy costs to outdoor recreation opportunities.
Seasonal Breakdown
Winters are cold, with January averaging 28.5°F. summers are warm — July averages 73.8°F. The 45°F seasonal variation provides noticeable but manageable change.
Outdoor & Gardening Guidance
Growing season and gardening data is currently limited for Jerome County. Check the USDA Plant Hardiness Zone Map and local extension office for specific guidance.
Regional Context
Jerome County is 3.1°F warmer than the Idaho statewide average of 46.5°F, it is also noticeably drier, receiving 6.6 inches less precipitation than the state average.
Climate Profile
About Jerome County Weather
A warm pocket in the Intermountain West
Jerome County's 49.6°F average temperature is closer to the national median than many of its Idaho neighbors. The climate is distinctly arid, receiving only 10.4 inches of annual precipitation.
One of Idaho's warmer regions
The county is significantly warmer than the state average, topping 46.5°F by more than three degrees. It is also much drier, falling nearly 7 inches short of the Idaho average annual precipitation.
Warmer and drier than the North
Jerome is nearly 3 degrees warmer annually than Kootenai County and significantly drier than most northern Idaho regions. It shares a similar high-heat profile with neighboring Lincoln County.
High heat and dry winters
Summer is intense here, featuring 43 days of temperatures at or above 90°F and a July average of 73.8°F. While specific snowfall data is limited, the winter average sits at a relatively mild 30.0°F.
Prioritize cooling and water conservation
With 43 extreme heat days, efficient air conditioning is a primary necessity for Jerome County residents. Xeriscaping and water-wise landscaping are also recommended due to the low 10.4-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.