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Winter lag of seasons: The time between the shortest day (which is the time of minimum heat input from the sun–about Dec. 21) and the actual date of the average lowest temperatures (in Chicago, about Jan. 16). Chicago’s lag of seasons during the winter: about four weeks.
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Tom Skilling is chief meteorologist at WGN-TV. His forecasts can be seen Monday through Friday on WGN-TV News at noon and 9 p.m.
WGN-TV meteorologists Steve Kahn, Richard Koeneman and Paul Dailey plus weather producer Bill Snyder contribute to this page.
