Here in north Florida we have already a few nights in the high 20s and one night in the high teens. A nice chilly morning, a nice chilly bucket of throwing water.
My solution is to put one of those coffee heater uppers in the water when I get to the shop, and by the time I am ready to throw, after my normal putzing around, the water is nice and warm.
Meghan is holding the coffee doo dad. Be sure not to let it get near the plastic of the bucket. I hang mine over a throwing stick.