In Ottawa, you should generally switch to winter tires when temperatures consistently drop below 7°C (45°F) and switch back to summer/all-season tires when temperatures consistently stay above 7°C (45°F).
In Ottawa, you should generally switch to winter tires when temperatures consistently drop below 7°C (45°F) and switch back to summer/all-season tires when temperatures consistently stay above 7°C (45°F).