So I realize this is an old thread, but instead of starting a new one, and the fact that it is almost January, I'm interested to hear what is the point where you won't go play due to the temp.
This morning, in SE Oklahoma, it's sunny and a brisk 24 degrees. I do plan on going to the driving range sometime today, but I don't know if I will play.I might play tomorrow. It's hard for me to muster the motivation to be out in the cold when I work in it all week. I guess some sacrificing of comfort will get my game better. In the hot temps, I don't mind playing. I drink plenty of water and if the temp is above 90, I will use a cart instead of walking (gave myself a touch of heat exhaustion this past summer walking in hot weather). All I know to do in cold weather is do some stretches before I go out and layer on the clothing.