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Illinois Climate & Weather

Illinois Climate and Weather


The weather in Illinois can be fairly extreme, in summer (June to August) temperatures rise to between 80-90°F (27-32°C) and there is high humidity, while in winter (January to March) it can be wet and cold, between 12°F and 29°F (-11°C and -2°C) with icy winds whipping off Lake Michigan and regular snow. May and September are the most pleasant months with reliably warm days.


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