Louisa County Climate
Louisa County, Iowa
NOAA NCEI 1991-2020 Climate NormalsAvg Annual Temp
48.8°F
Annual Precip
38.6"
Annual Snowfall
33.4"
Extreme Heat Days
17
days >= 90°F/yr
Monthly Temperature
Precipitation Calendar
Growing Season & Gardening
5b
Minimum winter temperature range for plant survival
3,051
Supports most vegetables & fruits
Seasonal Overview
National Comparison
7-Day Outlook
Forecast
Current Conditions
Air Quality
Safety
Weather Alerts
Climate Advisory: Louisa County
Climate Verdict
Louisa County has a cool, averaging 48.8°F annually, moderate rainfall of 38.6 inches per year, rare extreme heat with only 16.9 days above 90°F annually, moderate snowfall of 33.4 inches annually. This climate profile shapes everything from energy costs to outdoor recreation opportunities.
Seasonal Breakdown
Winters are very cold — January averages 20.4°F. summers are warm — July averages 73.4°F. Residents experience a substantial 53°F difference between winter and summer.
Outdoor & Gardening Guidance
Growing season and gardening data is currently limited for Louisa County. Check the USDA Plant Hardiness Zone Map and local extension office for specific guidance.
Regional Context
Louisa County closely matches the Iowa statewide average temperature of 48.0°F, it is somewhat wetter than average for Iowa.
Climate Profile
About Louisa County Weather
Consistent humid continental patterns
Louisa County's annual average of 48.8°F reflects a temperate climate that is cooler than the U.S. national median. The region experiences distinct seasonal transitions typical of the American Midwest.
Warmer and wetter than most of Iowa
The county's 48.8°F average temperature exceeds the state baseline of 48.0°F. Additionally, its 38.6 inches of annual precipitation is significantly higher than the Iowa average of 36.1 inches.
Leading neighbors in precipitation
Louisa is wetter than neighboring Linn County, receiving an extra 1.5 inches of precipitation annually. It also experiences more extreme heat days than Linn, totaling 17 days per year above 90°F.
Heavier snowfall and humid summers
The county receives 33.4 inches of snow annually, which is higher than many of its immediate neighbors. Summer temperatures peak in July at 73.4°F, while winter averages stay around 23.6°F.
Equip homes for humidity and snow
With 17 days of extreme heat, central air conditioning is vital for comfortable summers. Homeowners should also prepare for heavier snow loads compared to counties further west.
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.