piffle
Contributor
If you plan on diving, say, Beaver Lake. Even in June and July the water temp at depth is still only in the 50's. Forget April and May. Tenkiller was low 50's in mid April. (Check out dive conditions at midwestmuckdiving.com) If you dive there in a 3mm, you WILL freeze. If you're talking only one suit, I would still go with 7mm or at least a 7/5mm. It might be more restrictive, but it beats being cold.
