Yes, Florida is anything but guaranteed for wx, and I recall a post here from another "UK Florida PPL" who was out there for weeks and missed most days' flying, and was well cheesed off. I've been there on holes a number of times...
Arizona is 362/365 CAVOK or easily flyable. But there are no JAA-capable schools there. If there were, they would wipe the floor on training. I recall some European airlines doing training out there, years ago. Must have been just CPL hour building because JAA prohibits any IR training outside JAA-land.
S. California is the only other place.