It's like the song says, "Baby, it's cold outside."
An extreme cold warning is in effect in southern parts of Grey County and into Wellington County with the wind chill at -30 C or lower.
Highs are only expected to reach -10 C on Thursday, with it being colder in some areas.
Snow squall warnings were also in effect for Huron County and southern areas of Bruce County, but they have since been rescinded.
Extreme cold warnings are issued when very cold temperatures or wind chill creates an elevated risk to health such as frostbite and hypothermia.