Today we had one of the coldest mornings of the year and temperatures are only going to drop as February arrives.
The city remains under an extreme cold weather alert and the worst of the frigid air is expected to be felt by the end of the week.
Meteorologist Jill Taylor, said the cold snap follows an extended period of relatively mild weather in January.
"Some of the coldest highs we've experienced in about three years for Friday," Taylor says, adding that the overnight low Friday into Saturday morning could reach the coldest air in the city since 2016.
The high for Friday is -14 C and is expected to drop below -20 C overnight. That doesn't even take into account the potential wind chill.
A winter weather travel advisory is in effect for areas north of Toronto, including Barrie. Lake effect flurries could extend to parts of the GTA.
Then, the forecast changes over the weekend with a high of 3°C expected on Sunday and things will remain milder next week.
In the U.S., there are about 40 million people under winter weather alerts from Texas to West Virginia as a multi-state storm has caused thousands of flights to be cancelled.
The City of Toronto announced it will open a fourth warming center downtown. The Cecil Community Centre near College Street and Spadina Avenue will provide space for 30 homeless Toronto residents to spend the night.