A weather alert has been issued for nearly all of southern Ontario.

Environment Canada has issued a yellow frost advisory for an area stretching from Ottawa, south to Chatham.

The Greater Toronto Area, Hamilton, Niagara Region, Kitchener — Waterloo, and London are among the areas impacted by the alert.

For much of the region, forecasters said temperatures are expected to fall to near or below the freezing mark Monday night into Tuesday morning.

The advisory reads slightly different for parts of the Greater Toronto Area, Hamilton, Niagara, and extreme southwestern areas including Chatham, where temperatures are expected to fall to near 0 C overnight into the morning.

“Damage to plants, trees, and crops is possible,” Environment Canada said.

“Take preventative measures to protect cold-sensitive plants, trees, and crops. Cover up plants, especially those in frost-prone areas.”

Environment Canada has a low of 2 C in the forecast for Toronto, with a high of 16 C and sunny conditions expected during the day on Tuesday.

Ottawa is expecting a low of 1 C overnight and a high of 13 C with sun on Tuesday.

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Areas shaded in yellow are under a frost advisory from Environment Canada. (Credit: Environment Canada)

Environment Canada issues frost advisories when frost or freezing temperatures are expected during the growing season.

Other than the frost advisory, Environment Canada’s vigilance outlook says no significant weather is expected in Ontario over the next few days.

Meanwhile, Canada’s first blizzard warning of the season was issued over the weekend for part of Yukon and remains in effect.

The Weather Network reported that temperatures also dropped to -20 C in Yukon and Nunavut on Sunday. They said similar conditions have been seen in recent years by late September, but normally it takes until deep winter to get temperatures that cold to go further south.


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