Hancock County Climate
Hancock County, Illinois
Avg Annual Temp
51.8°F
Annual Precip
40.2"
Annual Snowfall
22.9"
Extreme Heat Days
27.65
days >= 90°F/yr
Monthly Temperature
Precipitation Calendar
Seasonal Overview
National Comparison
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 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.