Clayton County Climate
Clayton County, Iowa
Avg Annual Temp
47.2°F
Annual Precip
38.6"
Annual Snowfall
36.8"
Extreme Heat Days
11.05
days >= 90°F/yr
Monthly Temperature
Precipitation Calendar
Seasonal Overview
National Comparison
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 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.