Clinton County Climate
Clinton County, Iowa
Avg Annual Temp
50.2°F
Annual Precip
37.2"
Annual Snowfall
30.3"
Extreme Heat Days
14.5
days >= 90°F/yr
Monthly Temperature
Precipitation Calendar
Seasonal Overview
National Comparison
Climate Profile
About Clinton County Weather
Clinton County enjoys a warmer Iowa climate
At 50.2°F, Clinton County's average temperature is one of the highest in the state, though still below the national median. This eastern county experiences the full range of humid continental seasons with a milder edge.
One of the state's warmest regions
Clinton County's average annual temperature of 50.2°F is 2.2 degrees higher than the state average. It also receives 37.2 inches of precipitation, slightly more than the Iowa norm of 36.1 inches.
Less snow than the northern interior
The county receives 30.3 inches of snow, which is significantly less than the 40+ inches seen in counties like Clay. Its 15 extreme heat days represent a middle ground between the cooler north and hotter south.
Longer summers and milder winter lows
July averages 74.4°F, while the winter average of 25.2°F is the warmest among this group. This results in less extreme cold, though 15 days of 90°F heat still occur each year.
Prioritize humidity control and rain prep
With 37.2 inches of annual precipitation and warmer temperatures, humidity can be high; dehumidifiers are a smart home investment. Residents should still keep a snow shovel ready for the 30.3 inches of annual snowfall.
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.