Clarke County Climate
Clarke County, Iowa
Avg Annual Temp
49.8°F
Annual Precip
38.7"
Annual Snowfall
28.1"
Extreme Heat Days
25
days >= 90°F/yr
Monthly Temperature
Precipitation Calendar
Seasonal Overview
National Comparison
Climate Profile
About Clarke County Weather
Clarke County approaches national temperature averages
An annual average of 49.8°F puts Clarke County closer to the national median than its northern Iowa peers. The climate remains humid continental but benefits from a more southern latitude.
A warmer pocket in the Iowa landscape
Clarke County is nearly two degrees warmer than the Iowa state average of 48.0°F. It also exceeds the state precipitation average, receiving 38.7 inches of rainfall and snow annually.
Higher heat frequency than northern neighbors
Clarke County experiences 25 extreme heat days annually, far more than the 8 to 10 days seen in northern Iowa. It also sees significantly less snow, with 28.1 inches compared to the 40+ inches found in the north.
Hot summers and manageable winter totals
July averages 75.2°F, fueled by frequent heat waves that push temperatures above 90°F twenty-five times per year. Winters are milder than the state average, with a January mean of 21.8°F.
Prepare for significant summer heat waves
With 25 days of extreme heat, robust HVAC systems are the top priority for Clarke County residents. While snowfall is lower at 28.1 inches, the 38.7 inches of precipitation suggests a need for good drainage and rain gear.
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.