Temperatures in the GTA plummeted to -23 C in the early morning hours, and felt more like -33 with wind chill. The high on the day throughout the region is -14 C. The average high temperature for this time of year in Toronto is -1 C.
"Bitterly cold arctic air is combining with light northerly winds to create wind chills of minus 30 to minus 35 this morning. Conditions will improve later this morning as temperatures rise," said a statement released by the federal weather agency.
Extreme cold warnings are issued by Environment Canada "when very cold temperatures or wind chill creates an elevated risk to health such as frost bite and hypothermia."
The chief medical officer of Toronto also issued a warning specific to the city. Additional services for the homeless are made available when the city is under such an advisory.
Yesterday was the coldest day on record at Toronto Pearson airport.
Officials at Pearson and Billy Bishop airports are warning travellers to check their flight statues before heading out because the cold temperatures could cause delays or cancellations, particularly for flights scheduled to fly to the Canadian East Coast and eastern seaboard of the U.S.