Clinton County Climate
Clinton County, Iowa
NOAA NCEI 1991-2020 Climate NormalsAvg Annual Temp
50.2°F
Annual Precip
37.2"
Annual Snowfall
30.3"
Extreme Heat Days
15
days >= 90°F/yr
Monthly Temperature
Precipitation Calendar
Growing Season & Gardening
5a
Minimum winter temperature range for plant survival
3,282
Supports most vegetables & fruits
Seasonal Overview
National Comparison
7-Day Outlook
Forecast
Current Conditions
Air Quality
Safety
Weather Alerts
Climate Advisory: Clinton County
Climate Verdict
Clinton County has a mild, with an average annual temperature of 50.2°F, moderate rainfall of 37.2 inches per year, rare extreme heat with only 14.5 days above 90°F annually, moderate snowfall of 30.3 inches annually. This climate profile shapes everything from energy costs to outdoor recreation opportunities.
Seasonal Breakdown
Winters are very cold — January averages 21.9°F. summers are warm — July averages 74.4°F. Residents experience a substantial 53°F difference between winter and summer.
Outdoor & Gardening Guidance
Growing season and gardening data is currently limited for Clinton County. Check the USDA Plant Hardiness Zone Map and local extension office for specific guidance.
Regional Context
Clinton County closely matches the Iowa statewide average temperature of 48.0°F.
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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Track your own weather in Clinton County
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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.