Winter temperatures in Calgary are quite cold as the average low is at -15,1 ºC and the high at -2,8 ºC. However, there are colder Canadian cities, such as Yellowknife, where the average low is -30,9 ºC. You have all the information in: «The climate of Canada: information and temperatures«.
You have all the information in: "The climate of Canada: information and temperatures".