Most home freezers sit at about −18°C. At −63°C, things behave very differently. Hot water thrown from a cup turns to snow before it hits the ground. If you breathe out, you can sometimes hear a soft crackle - the moisture in your breath freezing into tiny crystals in the air.
Even in the warmer parts of Canada, like Toronto and Montreal, winter can be very cold - usually well below freezing. Canadian children walk to school in proper winter coats, snow trousers, hats, mittens and boots. Many schools have a special room called a 'mud room' just for taking off all the snowy gear.
Far in the north, in the Yukon and the Northwest Territories and Nunavut, winter is long and dark. The sun barely rises in midwinter. People keep warm with very thick walls in their houses, big stoves, lots of layers, and warm hot drinks.
Canadians have all sorts of inventions for the cold. They invented the snow blower, the snowmobile, the goalie's hockey mask, and electric coats that warm themselves up. Living through cold winters together is a big part of being Canadian.