There is a really handy tool online which lets you check the
weather in Toronto day by day. This will let you see how the weather is leading up to your trip. During winter Toronto’s weather conditions are much harsher than you could expect. The city receives its first snow during late August, and continues to receive deposits of snow through out the rest of the winter. The average minimum temperatures are around -1 degree Celsius, and the average maximum temperatures are around 16 degrees Celsius. You’ll feel the cold when visiting Toronto during the winter, although Toronto’s weather conditions make it an excellent destination if you want to go on a ski trip.
As for Ski-ing and Snowboarding there is a fantastic resort called Blue Mountain in Ontario. This would be a 2 hour drive from Toronto but would be well worth a visit. Here they dont only offer fabulous slopes but various other activities such as paint balling, golf and much more.