The US side of the partly frozen Niagara Falls is pictured in Ontario. A low of -22.5C ties with the previous record set for the Niagara area in 1942. The frigid air and ‘polar vortex’ that affected about 240 million people in the US and southern Canada will depart during the second half of this week, and a far-reaching January thaw will begin, according to AccuWeather.com.
