Long time ago when living in MD, the flavorizer bars and grates in my gasser rusted out prematurely. I called Weber and the CS person at that time suggested not covering the grill. She said they were designed to withstand most environments and that the cover actually holds in moisture and may have caused the corrosion. Since then I have never covered my gasser. Not sure due to the electronics on the SmokeFire how appropriate it is to not cover it and Weber really pushes their cover for it. Living in SC now, humidity is a factor as well as some pretty good rains.