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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.
Temperature and Humidity
Illinois Average Temperatures
Illinois Relative Humidity
MeasurementPer Year
Humidity (AM)77.7%
Humidity (PM)64.7%
Low Temperature Yearly Average41.4 °F
High Temperature Yearly Average62.0 °F
Days under 32ºF118 Days
Days above 90ºF25 Days
Precipitation Inches Per Year38.99"
Precipitation Days108 Days
Clear Days98 Days
Partly Cloudy Days99 Days
Cloudy Days167 Days

Weather History by State:

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