This thread made me curious enough to do a few google searches. Apparently, there is evidence both ways, and no set conclusions. Some studies show that the body has to expend more energy maintaining warmth in cold weather, evidenced by shivering. Some say that the heart works harder to cool us off in hot temperatures. Apparently, both extremes make for more "work" for the body, hence more calorie expenditure.
Studies apparently also show that humans (and other animals) are generally more active in the warm months. They find that weight loss comes more easily during warm weather because of this increase in activity.
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The same stream of life that runs through my veins night and day
runs through the world and dances in rhythmic measures.
from Stream of Life, Rabindranath Tragore
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