Hardin County Climate
Hardin County, Illinois
NOAA NCEI 1991-2020 Climate NormalsAvg Annual Temp
54.8°F
Annual Precip
50.9"
Annual Snowfall
3.3"
Extreme Heat Days
31
days >= 90°F/yr
Monthly Temperature
Precipitation Calendar
Growing Season & Gardening
7a
Minimum winter temperature range for plant survival
3,804
Supports most vegetables & fruits
Seasonal Overview
National Comparison
7-Day Outlook
Forecast
Current Conditions
Air Quality
Safety
Weather Alerts
Climate Advisory: Hardin County
Climate Verdict
Hardin County has a mild, with an average annual temperature of 54.8°F, moderately wet with 50.9 inches of annual precipitation, occasional hot days — 30.9 per year above 90°F, light snow averaging 3.3 inches per year. This climate profile shapes everything from energy costs to outdoor recreation opportunities.
Seasonal Breakdown
Winters are cold, with January averaging 31.8°F. summers are warm — July averages 75.8°F. The 44°F seasonal variation provides noticeable but manageable change.
Outdoor & Gardening Guidance
Growing season and gardening data is currently limited for Hardin County. Check the USDA Plant Hardiness Zone Map and local extension office for specific guidance.
Regional Context
Hardin County closely matches the Illinois statewide average temperature of 52.8°F, it is also noticeably wetter, receiving 9.1 inches more precipitation than the state average.
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 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.