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Illinois Climate
Highest Temperature The highest temperature recorded in Illinois is 117°, Fahrenheit. This record high was recorded on July 14, 1954 at East St. Louis.
Lowest Temperature The lowest temperature in Illinois, -36°, was recorded on January 5, 1999 at Congerville.
Average Temperature Monthly average temperatures range from a high of 87.1 degrees to a low of 9.8 degrees.
Climate Average yearly precipitation for Illinois, from 1971 to 2000, is shown on this chart from Oregon State University.