Don't get me wrong, swinging a bat in 20 degree weather has damage possibilities. You have a ball that has went up a hundred in compression, and a cold azz bat that fibers aren't going to flex as well.
But I would have no issues using a bat in the 40's and do it all the time and I can make a bat compress pretty well.
But I would have no issues using a bat in the 40's and do it all the time and I can make a bat compress pretty well.