Toronto and the GTA remains under a wind chill warning Tuesday morning.
Environment Canada warns these frigid temperatures are expected to last throughout the day with values reaching the minus 30's in the A.M.
The wind chills will improve somewhat Tuesday afternoon but are expected to return to near minus 30 or colder again at night across many areas as the strong and gusty winds persist.
Further north in Thunder Bay, Dryden and the Sioux Lookout, wind chills of minus 45 to minus 40 are occurring again.
The weather agency warns that frostbite and hypothermia will occur under these temperatures if you're not dressed warmly and these conditions can happen within minutes of having your skin exposed to the elements.
In the United States, snow and ice scattered across the deep south, prompting officials from New Orleans to North Carolina to ready road crews and close some schools.
Popular warm-weather tourist destinations including Charleston, S.C., Savannah, Ga., Pensacola, Fla., and New Orleans are expecting ice and even snow. Both rare occurrences in places that seldom see prolonged sub-freezing temperatures.
Delta Air Lines officials say more than 1,800 flights have been cancelled ahead of a winter storm expected to pelt areas of the Southeast with sleet and snow.