Parts of the US and Canada are gripped by freezing temperatures as a “polar vortex” weather system sends the mercury running for cover. <br /><br />The latest freeze follows a snow storm, which has already blanketed areas of Canada and north-eastern United States.<br /><br />The weather has played havoc with transport with 3,000 flights cancelled on Monday on top of the thousands that failed to take off over the weekend. <br /><br />Schools have closed in a number of states and residents are being advised to stay indoors.<br /><br />Sports fans are a hardy lot and in Wisconsin the 70,000 people who braved the conditions to see the Green Bay Packers play the San Francisco 49ers dressed for the occasion.<br /><br />“Four layers of long johns, two sets of snow pants, four shirts, a sweatshirt, and a coat,” said one wrapped up Packer.<br /><br />Green Bay offered fans free hand warmers, hot coffee and chocolate.<br /><br />Sadly on the field they could not deliver a result losing by a chilling 23 to 20 to the boys from California.
