Chicago - Weather
Weather in Chicago is all over the map and can range from sweltering in the summer time to freezing cold with a chance of heavy snow in the winter. If you are visiting Chicago from the Midwest or from the prairie provinces of Canada, you understand how dramatic the swings of weather can be in Chicago.
If you are visiting from the deep south, Europe or the Pacific Northwest, you may want to pack most of your wardrobe for your visit.
Summers only really require shorts, t-shirts, Polo shirts, a pair of jeans or so and maybe a sweater just in case. It is the spring and fall that can swing back and forth from near tropical to freezing in the matter of a day. Winters in Chicago require heavy winter gear. A winter coat, several sweaters and long pants are absolutely mandatory.
Chicago Climate Chart