What I didn't mention was that in Jan and Feb the water is the same temperature from surface to bottom. This is actually the best time to dive the deeper sites. As the thermocline starts to descend in the spring the silt and trash gets trapped in the cold water layer. Visibility beneath the thermocline is sometimes zero. In June or July the main thermocline is down to about 40 feet and gives you a great deal better visibility and a much more comfortable dive.
Rick Murchison was up there about a month ago and forgot his hood. He went ahead and did a 30 or so minute dive and it took quite a while and some Sam Adams for him to recover his body temperature.
We're looking really forward to the diving season up there because it is near and the price is right. Plus there is Sinclair's restaurant for a fine decompression stop.
Beat me to it... what is the temp right now past 40? When I was there I got down to 35 but no deeper than that. Don't get me wrong I'm ready for the diving season too, just really want to get some diving in now and it has to be really close.