The University of Chicago does not necessarily endorse the parties represented. This is often the case. Chicago enjoys four distinct seasons, although Spring and Fall seem to go by rather quickly. If you are visiting in December through March, dress warmly and in layers.
Most days are overcast and grey.
Wind chills often mislead what one expects from the air temperatures. Visitors from April to June can usually get by with a jacket. There is a fair amount of rain earilier in the Spring, but many days are sunny and breezy. July through mid-September brings hot and often humid air. Relief for weary visitors can be found at the lakefront.