Clayton County Climate
Clayton County, Iowa
NOAA NCEI 1991-2020 Climate NormalsAvg Annual Temp
47.2°F
Annual Precip
38.6"
Annual Snowfall
36.8"
Extreme Heat Days
11
days >= 90°F/yr
Monthly Temperature
Precipitation Calendar
Growing Season & Gardening
5a
Minimum winter temperature range for plant survival
2,829
Supports most vegetables & fruits
Seasonal Overview
National Comparison
7-Day Outlook
Forecast
Current Conditions
Air Quality
Safety
Weather Alerts
Climate Advisory: Clayton County
Climate Verdict
Clayton County has a cool, averaging 47.2°F annually, moderate rainfall of 38.6 inches per year, rare extreme heat with only 11.05 days above 90°F annually, moderate snowfall of 36.8 inches annually. This climate profile shapes everything from energy costs to outdoor recreation opportunities.
Seasonal Breakdown
Winters are very cold — January averages 17.7°F. summers are warm — July averages 72.5°F. Residents experience a substantial 55°F difference between winter and summer.
Outdoor & Gardening Guidance
Growing season and gardening data is currently limited for Clayton County. Check the USDA Plant Hardiness Zone Map and local extension office for specific guidance.
Regional Context
Clayton County closely matches the Iowa statewide average temperature of 48.0°F, it is somewhat wetter than average for Iowa.
Climate Profile
About Clayton County Weather
Clayton County mirrors the Midwest median
The county's average annual temperature of 47.2°F is standard for the humid continental climate of the northern United States. This temperature is lower than the national average but typical for its latitude.
A wet and temperate Iowa county
Clayton County is slightly cooler than the 48.0°F state average, but it is much wetter than many peers. It receives 38.6 inches of annual precipitation, surpassing the state average of 36.1 inches.
Moderate heat compared to southern Iowa
Clayton County sees only 11 extreme heat days, which is much lower than the 25 days recorded in southern counties like Clarke. Its snowfall of 36.8 inches is fairly typical for northeastern Iowa.
Pleasant summers and standard snowy winters
Summer temperatures average a comfortable 70.6°F, with July peaking at 72.5°F. Winter brings a significant cool down, with a January average of 17.7°F and over 36 inches of snow.
Plan for moisture and moderate winters
With 38.6 inches of precipitation, residents should ensure their homes have proper gutter systems and basement waterproofing. The 36.8 inches of annual snowfall requires standard winter equipment and insulated clothing.
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.