Jerome County Climate
Jerome County, Idaho
Avg Annual Temp
49.6°F
Annual Precip
10.4"
Annual Snowfall
—
Extreme Heat Days
43.366666666666674
days >= 90°F/yr
Monthly Temperature
Precipitation Calendar
Seasonal Overview
National Comparison
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
What is the average temperature in Jerome County?
How much rain does Jerome County get?
How hot does Jerome County get in summer?
How cold are winters in Jerome County?
Track your own weather in Jerome County
Ambient Weather personal weather stations give you hyperlocal climate data.
Sponsored
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.