Bruce,
I’ve been diving up around Door County a couple of times with decent viz, and in late summer on the bay side the water temps can be in the 60’s. I’ll probably be heading back up there in early August or September to train some friends in the Sister Bay / Fish Creek area. I can hit you up when I go if you like? Pebble Beach is one of my fav. dive sites and there’s an interesting wreck marked by a buoy in about 30’ of water at the SE end of Little Sister Island that’s an easy dive with lots of bass and other fish present. I hope this helps!
-Curtis