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Meteorological autumn: Comprised of September, October and November, it begins on Sept. 1. Astronomical autumn extends from the autumnal equinox to the winter solstice (about Sept. 21 to Dec. 21).
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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
