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Percent of possible sunshine: The ratio, expressed as a percentage, of the amount of time bright sunshine occurs on a given day to the total time the sun is above the horizon on that day.
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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.
