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"That's the most snow that's fallen on Nov. 9 at that site ever. The previous record was 1.5 centimetres (that) fell back in 1971," he said.

"If we look further into the record books, the only snowier date earlier in the month was Nov. 2, 1966, where the Pearson airport reported 10.2 centimetres of snow."

He said 7.1 centimetres of snow fell on Oct. 21, 1969, and another 5.3 centimetres the next day. 

"It was a two-day event back then that gave a notable snowfall," he said. "There's been other events that they may have had some snow, but not necessarily the amounts that we're talking about."

The snow was caused by a low pressure system that blanketed much of southern Ontario, with 16 centimetres reported in Hamilton and 11.7 centimetres in Ottawa as of Monday morning.

It led to tricky driving conditions, with Ontario Provincial Police reporting hundreds of collisions on Greater Toronto Area roads. 

OPP Sgt. Kerry Schmidt said officers responded to about 220 crashes by Monday morning, and police received reports of another 120 vehicles stuck in the snow. 

Environment Canada said a high of -1 C and more flurries were forecasted in Toronto on Monday, with a low of -2 with the wind chill near -7 Monday night.

The agency has issued snow squall warnings for the south end of Georgian Bay, including Owen Sound, the Blue Mountains, Simcoe County, southern Huron County, Middlesex County and Lambton County.

"The worst of that activity will be ending by midday on Tuesday, but it is quite possible that some locations in the snow belt in these affected areas could receive an additional 15 to 30 centimetres of snow," Coulson said.

Toronto and much of southern Ontario will see a return to more seasonal temperatures by the middle of the week, Coulson said.

"A normal high for this time of year is 8 degrees, looking at temperatures getting back to 6 to 7 degrees by midweek for those daytime highs," he said.

"Any chance of precipitation from Wednesday into Friday will be more in the form of shower activity."

This report by ºÃÉ«tvwas first published Nov. 10, 2025.