It's cold when you have to wear wool innerclothing, two pants, normal sweater, thick sweater, winter jacket and cover your face to be "comfy" so minus 30 and below
>>212359831 (OP) Around -15 you have to think about how to dress. Wearing thick gloves or 2 pairs. Before that it's just long johns, scarf, hat and regular gloves.
Over 20 degress is to hot. If it's 20 during the night it's a nightmare.