Plymouth County Climate
Plymouth County, Iowa
NOAA NCEI 1991-2020 Climate NormalsAvg Annual Temp
46.9°F
Annual Precip
29.7"
Annual Snowfall
33.8"
Extreme Heat Days
17
days >= 90°F/yr
Monthly Temperature
Precipitation Calendar
Growing Season & Gardening
5a
Minimum winter temperature range for plant survival
2,887
Supports most vegetables & fruits
Seasonal Overview
National Comparison
7-Day Outlook
Forecast
Current Conditions
Air Quality
Safety
Weather Alerts
Climate Advisory: Plymouth County
Climate Verdict
Plymouth County has a cool, averaging 46.9°F annually, moderate rainfall of 29.7 inches per year, rare extreme heat with only 17.2 days above 90°F annually, moderate snowfall of 33.8 inches annually. This climate profile shapes everything from energy costs to outdoor recreation opportunities.
Seasonal Breakdown
Winters are very cold — January averages 17.3°F. summers are warm — July averages 73.1°F. Residents experience a substantial 56°F difference between winter and summer.
Outdoor & Gardening Guidance
Growing season and gardening data is currently limited for Plymouth County. Check the USDA Plant Hardiness Zone Map and local extension office for specific guidance.
Regional Context
Plymouth County closely matches the Iowa statewide average temperature of 48.0°F, it is also noticeably drier, receiving 6.4 inches less precipitation than the state average.
Climate Profile
About Plymouth County Weather
A Brisk and Dry Continental Climate
Plymouth County is cooler and drier than the national average, with a mean temperature of 46.9°F. Its annual precipitation of 29.7 inches is notably lower than the national median, reflecting its position in Western Iowa.
One of Iowa’s Drier Northwest Counties
Plymouth County receives only 29.7 inches of precipitation annually, well below the state average of 36.1 inches. Its 46.9°F annual temperature also tracks over a degree cooler than the statewide mean.
Drier and Cooler Than Eastern Neighbors
Compared to Pocahontas County, Plymouth is significantly drier, receiving 3 inches less precipitation annually. It maintains a similar temperature profile to its neighbors but with fewer extreme snow days than those further east.
Cold Winters and Moderate Summer Peaks
Winter is sharp with a January average of 17.3°F and 33.8 inches of annual snow. Summer brings 17 days of temperatures at or above 90°F, though the overall July average remains a comfortable 73.1°F.
Manage Dry Soils and Winter Winds
Gardeners should choose drought-resistant plants to accommodate the low 29.7-inch rainfall average. Heavy winter coats and wind protection are essential for the 20.5°F average winter temperatures.
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.