Lyon County Climate
Lyon County, Iowa
Avg Annual Temp
46.0°F
Annual Precip
29.3"
Annual Snowfall
34.9"
Extreme Heat Days
18.5
days >= 90°F/yr
Monthly Temperature
Precipitation Calendar
Seasonal Overview
National Comparison
Climate Profile
About Lyon County Weather
The cold edge of the prairie
Lyon County is one of the cooler spots in the nation with an annual average of just 46.0°F. This is significantly lower than the national median, reflecting its position in the far northwest corner of Iowa.
Colder and drier than the state
Lyon's 46.0°F average is 2.0 degrees lower than the Iowa state average. It is also considerably drier than the rest of the state, receiving only 29.3 inches of precipitation annually.
A unique climate among neighbors
Lyon is notably colder and drier than Marshall County, which averages 47.7°F and 35.9 inches of rain. Despite the cold, it surprisingly records 19 days of extreme heat, more than many warmer counties.
Harsh winters and high-contrast summers
Winter is intense here, with a January average of only 15.6°F and 34.9 inches of snow. Summers reach a July average of 73.3°F, creating a massive temperature swing between seasons.
Heavy-duty heating is mandatory
With a winter average of 19.1°F, residents must invest in high-performance HVAC systems. The combination of 34.9 inches of snow and extreme January lows requires specialized winter gear.
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.