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It was shirtsleeves weather in southern cities Sunday. It's not like that anymore. Get the details.

Ontario: Massive temp drop between Sunday and Monday

Daniel Martins
Digital Reporter

Monday, December 1, 2014, 8:17 AM - Shirtsleeves weather on the last day of November? That was southern Ontario on Sunday.

But if you put your winter jacket away, we hope you didn't stow it too deeply in your coat closet. The first day of December is ushering in temperatures that won't stray far from the 0oC mark for the rest of the week.

Toronto's forecasted high of 4oC on Wednesday is about as warm as it'll get this week, and Monday's expected maximum of -1oC is is almost 15 degrees colder than it was at Pearson International Airport on Sunday.

St. Catharines was even warmer, and most cities in southern Ontario made it past the 10oC mark.

But it's fair to say none of that warmth made it into northern Ontario. By 9 a.m. Sunday, the difference between Windsor in the southwest and Kenora in the northwest was a full 35 degrees.

It's looking to be even colder up north on Monday. Winds of 20 km/h are making an Arctic air mass feel even colder, with windchill values in the minus forties in the morning, and around -30 by the afternoon.

The region saw some snow and freezing rain over the weekend, and snow squalls are expected to bring even more to areas east of Superior.

"A trough passing over central parts of Ontario will bring snow to the Wawa, Sault Ste. Marie and Sudbury area today," Weather Network meteorologist Kelly Sonnenburg said early Monday. "Snow squall warnings have been issued and the area is expected to see up to 10 cm of snow, although it will be quite localized. Sudbury should see only a centimetre or two from this."

There's little chance of precipitation in the south on Monday, but Sonnenburg says there's a chance of brief flurries around the Huron and Georgian Bay areas, with northwest winds gusting up to 50 km/h.

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