Outdoor Speakers facing Lake Erie

I dunno, man. That's probably asking a lot (speakers of good quality that will also put up with the horrible weather you probably get there).

If it was me, I would really consider mounting your gear in such a way that it was easy to dismantle and store inside when not required. Unless of course you like to sit outside in blizzards and listen to Jimmy Buffet.

I've seen some JBL all-weather speakers (from the Control series, although they're all similarly weatherized) survive constant exposure for over a decade, and they still sound the same (pretty decent).