I didn't even know, which isn't surprising considering what my chemistry grade was in class. The thing is, I keep the ammo in my safe, which is located in my room in front of the radiator. The only thing I know is that the shelf life of ammunition can be from 20 to 30 years, and the conditions of storage of gunpowder, etc., I have not even thought about it. I think the ideal temperature is created by the same radiator that is behind the safe and if you want you can
get more info about old-style radiators, which creates the right temperature inside.