Clarke County Climate
Clarke County, Iowa
NOAA NCEI 1991-2020 Climate NormalsAvg 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
Growing Season & Gardening
5b
Minimum winter temperature range for plant survival
3,233
Supports most vegetables & fruits
Seasonal Overview
National Comparison
7-Day Outlook
Forecast
Current Conditions
Air Quality
Safety
Weather Alerts
Climate Advisory: Clarke County
Climate Verdict
Clarke County has a cool, averaging 49.8°F annually, moderate rainfall of 38.7 inches per year, occasional hot days — 25 per year above 90°F, moderate snowfall of 28.1 inches annually. This climate profile shapes everything from energy costs to outdoor recreation opportunities.
Seasonal Breakdown
Winters are very cold — January averages 21.8°F. summers are warm — July averages 75.2°F. Residents experience a substantial 53°F difference between winter and summer.
Outdoor & Gardening Guidance
Growing season and gardening data is currently limited for Clarke County. Check the USDA Plant Hardiness Zone Map and local extension office for specific guidance.
Regional Context
Clarke County closely matches the Iowa statewide average temperature of 48.0°F, it is somewhat wetter than average for Iowa.
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 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.