Hardin County Climate
Hardin County, Illinois
Avg Annual Temp
54.8°F
Annual Precip
50.9"
Annual Snowfall
3.3"
Extreme Heat Days
30.9
days >= 90°F/yr
Monthly Temperature
Precipitation Calendar
Seasonal Overview
National Comparison
Climate Profile
About Hardin County Weather
Warm and wet compared to national norms
Hardin County's 54.8°F average temperature exceeds the national median, placing it in a more temperate zone. It is significantly more humid than many other regions in the U.S.
One of the warmest spots in Illinois
The county's 54.8°F average temperature is 2.0°F warmer than the state average of 52.8°F. This makes it part of the warmer southern corridor of the state.
Leading the region in annual rainfall
With 50.9 inches of rain, Hardin is much wetter than the state average of 41.7 inches. It receives nearly 10 inches more precipitation than northern counties like Hancock.
Milder winters with very rare snowfall
Snowfall is minimal at just 3.3 inches per year, while summer brings 31 extreme heat days. January averages a relatively mild 31.8°F compared to northern Illinois.
Prioritize drainage and efficient summer cooling
Residents need to manage 50.9 inches of annual rain with proper home drainage and gutter maintenance. High-efficiency cooling is essential for the month-long stretch of 90°F days.
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.