Monthly Temperature Averages and Climate for Alton, IL

Alton, IL has a longitude of -90.1 degrees and a latitude of 38.9 degrees. Alton, IL has temperatures that can go as high as 85.9 °F in June, 87.7 °F in July, and 87.7 °F in August. The hottest month is typically August. Alton, IL also has temperatures that can go as low as 29.1 …

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