Texas Diver:Hey Lunar.
I agree with the Squeekycat - 3mm is all you are going to need in June.
But now on a more serious note:
Lunar. I'm thinking about inventing an electric wet suit, which will run off a rechargable 9 volt battery. So, no matter where you dive you can dial in a comfy 82 degrees inside the suit. And the weight of the battery will offset some of the weight you carry. I can't find a downside with this idea.
I am currently testing a suit on my cat. I just put her into a kitty suit, turn on the gizmo and throw her into our bath tub full of ice water. So far I only fried her slighty a couple of times. So don't even worry about getting electrocuted. That is all I can say at the moment. I am afraid I may unwittingly divulge enough information for a competitor to steal my idea and rush into production ahead of me.
Just think of it. No more embarrassing uncontrolled feet first ascents in a dry suit.
This is a HUGE money making idea. The next step in the evolution of scuba diving. Something Cousteau himself, would think of if he could come back from the dead.
Of course, being a loyal customer of Christi's, I would offer her the first suits to offer to her customers, free of charge.
If you are interested in pre ordering, just PM me and I will give you all the specifics about size and price. Or, you can wait until they are available to the general public. I am thinking of sellling them through the Time Share guys on Cozumel then going the franchise route.
I think that you should abandon the electrics idea and go with propane. Propane is cheap and easily obtainable, and you could use a little air from your tank to provide oxygen. You could run a heat exchanger from the burner to flow heated water through microtubules in the suit. Think about it. If you use my idea (which I just documented and had notarized, BTW), then I'll expect a licensing fee.