i've played just below 32deg before, but will not do that again (accept for ice bowl, since it's for charity). Being cold sucks, not being able to move sucks...one of those is sacrificed in cold weather.
I use coffee and Hand Warmers to try to stay warm. I wear mittens (with hand warmers inside). And I complain about the cold the whole time. I learn bad form from shortened run-ups and less flexibility, which translates to a bad start to the tourney season in the spring as well. That is the main reason I will not be doing that this winter.
Pretty stoked about this coming thanksgiving weekend though. Should be about 40deg, which is my self imposed limit this year. Going to try to get a few rounds in before winterizing my bag. (putting it in the closet with all my boxed discs as well)