However, -26C has been common. To a Brit that sounds cold, but it doesn't feel too bad if you don't stay long out in it. The reason for not feeling too cold is because there is no moisture in the air. We Brits think of our damp cold of around zero which gets to the bones, but in Canada -15C can be really quite pleasant. The sun can be shining and your living room can be very warm in winter as the sun pours in.
Houses are so much better heated than in Britain.
There is much better insulation, and they use a method of blowing hot air into the rooms through large ducts that run under the floor. I continually suffered electric shocks from the amount of static that built up in winter because it was so dry. You can expect snow for 5 months of the year. I found it more difficult to adapt to mosquitos, wood ticks and flies. Canadians tend to pride themselves at being politically correct which, in its extremes can be a bit silly.