Welcome! You are going to be amazed at what you can do on this grill/smoker!
I've always had a cover on mine, but I live in Iowa, where the winters are particularly harsh compared to NC. Don't fret rain - it's tile, just like in your bathroom. But, there's the sun factor. If your KK is going to be in the sun most of the day, then consider a cover to protect against UV and sun fade. Cheap insurance.