I wear pretty much the same clothes in very cold as in 40F - I have a huge coat that is not too hot when warmer but warm enough when colder. I will admit that sometimes I get a bit cold sitting there for too long and this could affect things. But I had one instance when all seemed fine (I was not cold) and I watched the arrow just "take off" high, very high. I have searched around and I have read where hunters say the bow shoots 5-10 lb heavier, which would give you a high shot. Also, the arrow is stiffer so that could affect things. What I might do is try out the bow right after I take it out, let it sit two full hours, and then try again.