A strong polar vortex keeps that cold air hemmed in. Yes, but more for how long — about 10 days — the cold has lasted, than how cold it has been. Visitors take photographs at the brink of the Horseshoe Falls in Niagara Falls, Ont., as cold weather continues through much of the province on Tuesday. (Aaron Lynett/Canadian Press)In Canada, a number of records are falling across the country, mainly for daily cold temperatures. "Montreal just broke an all-time record for longest-stretch of cold temperatures below –16 C," said Wagstaffe.

Source: CBC News January 03, 2018 15:17 UTC