Average humidity in Caseyville (IL)
The mean monthly relative humidity over the year in Caseyville (Illinois), the United States of America.
- On average, December is the most humid month, at 74.0%.
- On average, April is the least humid month, at 63.0%.
- The average annual percentage of humidity is 68%.
Forecast for Caseyville (IL)
overcast and heavy rain
almost clear and no rain
clear and no rain