I just can't get comfortable riding in cold weather (anywhere in the 40's). This winter I've been experimenting with different clothing configurations but still can't seem to get comfortable. I know the temps that I consider cold are probably somewhat balmy to others, but... it's just not in me. My mileage plummets when the temps drop. I'm hoping that one day I can find the right gear that will keep me warm, but until then, I'm sleeping in.