There's no such thing as "too cold" for this old fan! I have the clothing to keep me warm. I have hot socks, hoodies and a hot seat, a cushion that keeps your behind almost sweaty. I have played in 35 degree weather and I don't think the cold is that much uncomfortable for the players. I remember a team a few years ago that had propane heaters in the bench area to keep they warm when not playing.
We need to dress warmly and enjoy the games while we can!