Monona County Climate
Monona County, Iowa
Avg Annual Temp
48.0°F
Annual Precip
31.4"
Annual Snowfall
28.6"
Extreme Heat Days
19.9
days >= 90°F/yr
Monthly Temperature
Precipitation Calendar
Seasonal Overview
National Comparison
Climate Profile
About Monona County Weather
The Definition of Mid-Continental
Monona County averages 48.0°F annually, which is well below the national median but typical for the plains. It is slightly drier than average with 31.4 inches of precipitation.
Matching the State Baseline
Monona perfectly matches the Iowa state average temperature of 48.0°F. It serves as a climate benchmark for the transition between southern warmth and northern cold.
Cooler Than the South
The county is nearly 3 degrees cooler on average than Mills County to the south. However, it remains warmer than O'Brien County which sits further north.
Balanced Seasonal Extremes
Residents face 20 days of 90°F heat and 28.6 inches of annual snowfall. January is the coldest month, averaging 19.1°F, while July averages 73.7°F.
Versatile Home Prep Required
HVAC systems must be robust enough to handle both the 20 days of extreme heat and winter lows. Plan for moderate snow removal tasks to manage the 28.6 inches of annual accumulation.
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.