I've left cans sit in the direct sun here(in Mesa) and have never had a problem. FWIW this "ëxplosion" (like the can heated on the stove) can only happen if there is something to ignite it. A can just bursting is just a can bursting, not an explosion,but I wouldn't want to be too close . And just for all the Experts here, I worked at an aerosol valve manufacturer. I was in the Machine repair end and my brother & a friend were in Quality control.