Thanks again Mad Monk for some great info. This would be important to know for anyone living in our hotter sections of the country.
Smylee,
Right on with that one. Last place would be storage in a closed vehicle. Years ago I read one where the guy stuck a 1 pound can of black powder in the car's glove compartment and left it in there with the car parked in the blazing sun in Arizona. Took most of the dash out when it went up.