Plymouth County Climate
Plymouth County, Iowa
Avg Annual Temp
46.9°F
Annual Precip
29.7"
Annual Snowfall
33.8"
Extreme Heat Days
17.2
days >= 90°F/yr
Monthly Temperature
Precipitation Calendar
Seasonal Overview
National Comparison
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.
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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.