Jasper County Climate
Jasper County, Illinois
Avg Annual Temp
53.6°F
Annual Precip
45.1"
Annual Snowfall
15.1"
Extreme Heat Days
24.2
days >= 90°F/yr
Monthly Temperature
Precipitation Calendar
Seasonal Overview
National Comparison
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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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.