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Illinois Climate & Weather

Illinois Climate and Weather


Most of Illinois has a humid continental climate, with hot, humid summers and cold winters. The southernmost part of the state borders on a humid subtropical climate, boasting milder winters. 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, with temperatures as low as 12°F and 29°F (-11°C and -2°C), and icy winds whipping off Lake Michigan. Snow is likely in winter. May and September are the most pleasant months, with reliably warm, sunny days.


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