14 of the U.S. will experience below-zero temperatures this week. National Weather Service, Des Moines, Iowa, via statement Wednesday could be the br coldest day ever br recorded in Chicago, Mike Doll, AccuWeather Senior Meteorologist, via statement Wind chills as low as -55 in Chicago are "likely," 55 million people could experience temperatures below zero Wednesday morning. On the East Coast, Wednesday night lows could reach br 6 degrees in New York, 7 degrees in Philadelphia and br 9 degrees in Washington, D.C.