Not real sure on that I have heard that some are storing them in their refridgerators but, I don't know if that has proven to do anything or not. I generally keep mine in the basement in my shop which is usually around 68 to 70 degrees. I do know that in the winter at around 30 degrees or less if you don't keep em' warm they don't last as long during use but when warmed back up they perform normally again.

Jason