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A friend of mine in Canada is suffering -40c currently. She sent me a photo, that I've posted in photography section. I'd suggest you have a look.
Photo sent to me by a Canadian in Ontario.
Temperature -34c, ice crystals in the air cause light beams to shoot up into the sky, I'm guessing from the street lighting.
Also checkout the chimney smoke it rises until it cools and then stop ascending, amazing.