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Lag of seasons: The period between the longest day (June 21) and the hottest part of summer (late July), or the period between the shortest day (about Dec. 21) and the coldest part of winter (late January).
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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.
