Jasper County Climate
Jasper County, Illinois
NOAA NCEI 1991-2020 Climate NormalsAvg Annual Temp
53.6°F
Annual Precip
45.1"
Annual Snowfall
15.1"
Extreme Heat Days
24
days >= 90°F/yr
Monthly Temperature
Precipitation Calendar
Growing Season & Gardening
6b
Minimum winter temperature range for plant survival
3,680
Supports most vegetables & fruits
Seasonal Overview
National Comparison
7-Day Outlook
Forecast
Current Conditions
Air Quality
Safety
Weather Alerts
Climate Advisory: Jasper County
Climate Verdict
Jasper County has a mild, with an average annual temperature of 53.6°F, moderately wet with 45.1 inches of annual precipitation, occasional hot days — 24.2 per year above 90°F, light snow averaging 15.1 inches per year. This climate profile shapes everything from energy costs to outdoor recreation opportunities.
Seasonal Breakdown
Winters are cold, with January averaging 28.6°F. summers are warm — July averages 75.8°F. The 47°F seasonal variation provides noticeable but manageable change.
Outdoor & Gardening Guidance
Growing season and gardening data is currently limited for Jasper County. Check the USDA Plant Hardiness Zone Map and local extension office for specific guidance.
Regional Context
Jasper County closely matches the Illinois statewide average temperature of 52.8°F, it is somewhat wetter than average for Illinois.
Climate Profile
About Jasper County Weather
Perfectly aligned with the national median temperature
Jasper County's 53.6°F average temperature sits almost exactly at the U.S. median. Its 45.1 inches of rain makes it wetter than the national average.
Slightly warmer than the Illinois state average
The county is 0.8°F warmer than the state average of 52.8°F. This reflects its position in the southeastern part of Illinois.
Wetter and warmer than northern Iroquois County
Jasper receives 45.1 inches of precipitation, which is over 5 inches more than Iroquois. It also experiences 24 extreme heat days, compared to only 16 in the north.
Moderate snowfall and warm, humid summers
The county averages 15.1 inches of snow and 24 days above 90°F. January temperatures average 28.6°F, which is milder than northern Illinois counties.
Prepare for wet springs and hot summers
With 45.1 inches of annual rain, basement waterproofing is a wise investment. Ensure HVAC systems can handle the 75.8°F July average and 24 heat days.
Frequently Asked Questions
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Track your own weather in Jasper County
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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.