Hancock County Climate
Hancock County, Illinois
NOAA NCEI 1991-2020 Climate NormalsAvg Annual Temp
51.8°F
Annual Precip
40.2"
Annual Snowfall
22.9"
Extreme Heat Days
28
days >= 90°F/yr
Monthly Temperature
Precipitation Calendar
Growing Season & Gardening
6a
Minimum winter temperature range for plant survival
3,514
Supports most vegetables & fruits
Seasonal Overview
National Comparison
7-Day Outlook
Forecast
Current Conditions
Air Quality
Safety
Weather Alerts
Climate Advisory: Hancock County
Climate Verdict
Hancock County has a mild, with an average annual temperature of 51.8°F, moderately wet with 40.2 inches of annual precipitation, occasional hot days — 27.65 per year above 90°F, moderate snowfall of 22.9 inches annually. This climate profile shapes everything from energy costs to outdoor recreation opportunities.
Seasonal Breakdown
Winters are very cold — January averages 24.6°F. summers are warm — July averages 75.5°F. Residents experience a substantial 51°F difference between winter and summer.
Outdoor & Gardening Guidance
Growing season and gardening data is currently limited for Hancock County. Check the USDA Plant Hardiness Zone Map and local extension office for specific guidance.
Regional Context
Hancock County closely matches the Illinois statewide average temperature of 52.8°F.
Climate Profile
About Hancock County Weather
Hancock County is cooler than the national median
The county's average temperature of 51.8°F sits below the U.S. median of approximately 53°F. It experiences a classic humid continental climate with distinct seasonal shifts.
Below the Illinois state temperature average
Hancock's annual temperature of 51.8°F is exactly 1.0°F lower than the Illinois average of 52.8°F. This reflects its position in the west-central part of the state.
Drier than southern neighbors, wetter than northern ones
The county receives 40.2 inches of annual precipitation, which is slightly less than the state average of 41.7 inches. It remains significantly wetter than Henderson County to its north.
Sweating through nearly a month of extreme heat
Residents face 28 days per year with temperatures hitting 90°F or higher. Winter brings 22.9 inches of snow and average January lows of 24.6°F.
Prepare for significant winter snow and summer humidity
Homeowners should winterize for 22.9 inches of snow and ensure HVAC systems can handle the 75.5°F July average. Outdoor planning should account for the 28 days of extreme heat.
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.