A frost advisory was issued on Monday for parts of the Greater Toronto Area and a large swath of Southern Ontario.
“Patchy frost is expected overnight and into early Tuesday morning,” Environment Canada and Climate Change Canada said in an alert covering Markham, Vaughan, Richmond Hill, Caledon, Pickering, Oshawa and Uxbridge in the GTA.
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Toronto, Burlington and Oakville were not included in the frost advisory.
Parts of Southwestern Ontario, including Hamilton, Waterloo, Guelph, Kitchener, and London, are also covered by a frost advisory.
Brace for a chilly evening
From London to Guelph, the thermometer could drop as low as –3C or –4C during early Tuesday morning, according to The Weather Network , calling it “an exceptional chill for this time of year.”
Environment Canada warned that damage to plants, trees, and crops is possible, advising residents in frost-prone areas to cover up plants.
Temperatures in the GTA “will get dangerously close to the freezing mark,” The Weather Network said, with its forecast showing the thermometer dropping to 2C overnight and 4C Tuesday morning.
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Normal temperatures for this time of the year in Toronto are a high of 18C and a low of 8C, according to Environment Canada.
Frost advisories have also been issued in parts of Southeastern Ontario, covering Belleville and Ottawa.
While the week is off to a frigid start, Environment Canada’s forecast shows Toronto will finally warm up for the Victoria Day long weekend with a high of 21C expected on Friday, rising to 22C on Saturday and Sunday.