For example, running outside, during winter as opposed to summer. My guess would be that you do burn extra calories just to keep the body temperature up. To offset that though, maybe you sweat more in summer, so the body works harder and you burn more calories?
It doesn’t say which burns more, but it is probably dependant on how cold/hot it is. For example, maybe you burn the same amount of calories at 120 degrees as you do at 15 degrees. I have no idea as to the real numbers though.
Thermogenesis takes energy. You can get an idea of how much by comparing the calorie count of the military’s cold and warm weather rations. It looks like cold weather activities require an extra ~1500 calories a day.
I surf in water that’s about 53 deg. I always thought I used more energy trying to stay warm. This is because cold water is supposed to take heat from your body at ten times the rate of cold air, so you have to keep swimming to create heat & stay warm. In hot weather, you can stay calm & be warm. Seems to me, therefore you need more energy in cold weather.
Well I must start this post by saying that I haven’t read the links in the above statements, so this will be purely my opinion. It seems like when it’s cold out, the body would be trying to get warm. By excercising, you are helping the body to get warm. This seems as if it would make it easier for the body to get warm. Vice versa, in the heat, the body is trying to get cooler. By excercising, you are getting it hotter and hotter, making it harder for the body to reach the desired temperature. I would think that it would take more calories to perform the harder task, and therefore would burn more calories in the heat.
Just my opinion though