The only difference that I have seen that when you are sitting there for hours in 20 degree weather, your muscles become alot tighter than in the fall, also this temperature causes the limbs on the bow to become significantly more rigid. With both of these factors affecting, it is much harder for me to draw back my bow. But as stated above, the only thing affecting my accuracy is most likely the amount of clothing Im wearing which causes a lot more string slap for me if Im not careful. I read one of Jackie Bushman's books on hunting and he talked about a bow hunt early in his career in which it was very cold, maybe sub 20. He had a nice buck at 20 yards or so and when it came time, he said he could not physically draw his bow back because it was so cold. He said ever since then when he knows he is going to be hunting in extreme cold weather, he dials back his draw weight at least 5 pounds.