The only problem I have had flying in cold weather is my hands getting numb. Dress very warmly. When your core starts getting cold, your circulation to your extremities is reduced to save body heat. This will cause your hands to become very cold and then numb. So dress your entire body very warmly, wear a hat, bring a thermos of hot chocolate or something. Once your hands go numb, you are done. Can't fly if you can't feel the sticks. Sometimes you can get in the car and warm up, but it doesn't last .