I've been an avid spring/summer rider but this year I'm vowing to carry on into winter when the weather is cooperative. I'm not so concerned about the cold, but the winds and the precip have and will keep me at bay. Anyway, I've been riding in these cooler temps - upper 30s/lower 40s. I'm layered but otherwise riding in favorable conditions (<15 mph winds). I honestly haven't been riding as much with mileage falling off from about 130/wk to 70/wk. Part of that is time/conditions but the other part is I just don't seem to have as much energy in the cold weather. Does the body use such resources to maintain warmth thus draining my capacity for longer rides?