Forecasters say the temperature is expected to fall to around -10C throughout Sunday and -20C overnight.
Environment Canada issued a snow squall warning and extreme cold warning Sunday for Sarnia and Lambton County.
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NOTE: The Winter Weather Advisory issued Saturday evening expired at 10 a.m. Sunday morning. Clouds are clearing out this morning, so expect sunshine for the afternoon. Winds from the north at 20 km/h and gusting to 40 but then becoming light near midnight.
"Visibilities will also be reduced to near zero in blowing snow due to strong northerly winds gusting to 70 km/h", the warning states.
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During the overnight the temperature will drop to -23C - but again - it will feel more like -34C with the wind chill. "Cover up. Frostbite can develop within minutes on exposed skin, especially with wind chill".
Risks are greatest for young children, older adults, people with chronic illnesses, people working or exercising outdoors, and those without proper shelter, the warning said. The temperature is expected to reach a high of 2C on Wednesday.
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The agency warned it's also too cold for pets to stay outside.