The calendar may still say it’s fall, but winter weather is making an appearance both north and west of the GTA.

Lake-effect snow is already falling in the Barrie and London areas, with northern areas of the GTA also facing the risk of snow.

Whiteout conditions were reported in Barrie and Innisfil Saturday, as well as on parts of Highway 400.

Markham and Vaughan are both under a special-weather statement issued by Environment Canada warning of possible lake-effect snow Saturday.

Meteorologist Harold Hosein says cold air across Georgian Bay, along with Saturday’s gusty winds, can shoulder most of the blame.

“If you’re travelling north and north-west of Toronto, watch out for reduced visibilities and several centimetres of fresh snow, making for slippery driving conditions,” Hosein said.

Speaking of winter driving, Michelin Canada’s Sachin Despande says the first step is to get the right tires for the conditions.

“The moment the temperature starts dipping below seven degrees Celsius, even if it’s bone dry out there and daylight, you need to get your winter tires on,” Despande said.

With December almost here, it’s likely these wintry conditions are, for the most part, here to stay.