As I like to keep my windows up as much as possible, my house and my deck are similar. Bob believes we all deserve ribbons. After emails with a guy who has them on a yacht, I gave ribbons a shot on the deck for the last few months. (they are not cheap) I have the small trio ones, and the Summer has had no effect on them. They remain crisp and clear here in SC. They sound so good, it will break your heart. I don't use them to send sound over the yard, just have them zeroed in to this chair. They do require a sub.
Another myth is now crushed. Don't believe the guys posting on POLK who don't actually have speakers this good.
You can buy replacement ribbons for these even on Amazon cheap, but I can see I will not need to. Looking forward to testing them in snow fall this Winter.