Tobermory, you do the arabia? 120' deep. water temp 39 degrees year round.I did Tobermory in July in a wetsuit. Not as cold as Ice diving, but still cold enough that the boat captain was pouring hot water inside our wetsuits before each dive. And FWIW - I had upgraded my reg after my freeze up so no problems there! The wetsuit, however didn't get upgraded until after. Now, I wouldn't even consider a Ohio dive without my Drysuit! Well, Circleville twin quarries is pretty much bathing suit diving june-september so that doesn't count (but with their max depth of 15' - they hardly count as dives!
we used to drive down from michigan to do our students o/w checkout dives.
salisbury quarry, west of maumee, until it closed with development.
and then portage quarry down near bowling green.