Best time to go might be equated to the answer Madame Lily Bollinger gave when asked if she drank Champagne...
"I drink champagne when I'm happy and when I'm sad. Sometimes I drink it when I'm alone. When I have company I consider it obligatory. I trifle with it if I'm not hungry and drink it when I am. Otherwise, I never touch it -- unless I'm thirsty."
Anytime you can get there is the best time!! For me living on the Southeast coast, the summers are about the same so the time of the year doesn't matter. Once I move there the new question will be when is it a good time to visit the US....
