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World Travel Guide > Guides > North America > United States of America > Illinois

the fp is weather-climate-geography

Illinois Weather, climate and geography

Weather and climate

Best time to visit

Wide variation between hot summers and freezing winters, especially in the north of the state. The highest humidity is in the summer near the Great Lakes.

Required clothing

Warm winter clothes are needed in the coldest months. Light to mediumweights are advised for the summer. Rainwear may be useful.