Environment Canada has issued an extreme cold warning as Guelph and Waterloo region wait in an icy night on Tuesday.
The agency said it expects a temperature as low as -27 C with wind-cold values between -28 and -33.
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Residents are urged to stay indoors and keep their pets indoors as well. Anyone who needs to go out should dress warmly with layers and the outer layer should be windproof.
Frostbite can develop on exposed skin within minutes, Environment Canada said.
Extreme cold warnings are in effect for most of Ontario and extend as far as Quebec. The Sudbury area expects wind-cold values of around -40.
Old Man Winter on Wednesday will not give Guelph and Waterloo region much of a respite with a high of -13 C and a low of -17 C predicted by Environment Canada.
The two jurisdictions have opened a number of warm-up centers.
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