Lyon County Climate
Lyon County, Iowa
NOAA NCEI 1991-2020 Climate NormalsAvg Annual Temp
46.0°F
Annual Precip
29.3"
Annual Snowfall
34.9"
Extreme Heat Days
19
days >= 90°F/yr
Monthly Temperature
Precipitation Calendar
Growing Season & Gardening
5a
Minimum winter temperature range for plant survival
2,824
Supports most vegetables & fruits
Seasonal Overview
National Comparison
7-Day Outlook
Forecast
Current Conditions
Air Quality
Safety
Weather Alerts
Climate Advisory: Lyon County
Climate Verdict
Lyon County has a cool, averaging 46.0°F annually, moderate rainfall of 29.3 inches per year, rare extreme heat with only 18.5 days above 90°F annually, moderate snowfall of 34.9 inches annually. This climate profile shapes everything from energy costs to outdoor recreation opportunities.
Seasonal Breakdown
Winters are very cold — January averages 15.6°F. summers are warm — July averages 73.3°F. Residents experience a substantial 58°F difference between winter and summer.
Outdoor & Gardening Guidance
Growing season and gardening data is currently limited for Lyon County. Check the USDA Plant Hardiness Zone Map and local extension office for specific guidance.
Regional Context
Lyon County closely matches the Iowa statewide average temperature of 48.0°F, it is also noticeably drier, receiving 6.8 inches less precipitation than the state average.
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 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.