Illinois Weather History

Illinois weather history reports an annual average temperature of 51.7 °F with an average high temperature of 62.0 °F and an average low temperature of 41.4 °F.

The average weather in Illinois indicates a relative humidity in the morning of 77.7%, and 64.7% in the afternoon and evening. The annual precipitation average is 38.99 inches. The yearly cloudiness breakdown for Illinois indicates 98 days of clear skies, 99 days of partly cloudy skies, and 167 annual cloudy days.