I believe air temps will be much better than 13 degrees.
I am guessing more like the 20 range. As for water temps, let the barbs begin, count on 48 degrees. Sorry the computer is set to read in celcius and I just haven't taken the time to convert.
I will let you know if a spot is open on that Bahamas trip. I know Watt is coming again and Sallmon. Fleetham is a maybe. If my wife opts for not going I will let you know as that would free a spot. That is in the Bahamas, not the USA, so feeding is allowed.
As for the hundred sharks, I would love it. Although the artificial 14ft hammerheads and tigers come around I still find them to be a truly beautiful creature to see. I am hoping we see the Bulls up at Walker's again too.
You should go see Chris and Monique in SA for the flying sharks. They were on our trip in January. I haven't yet but am really hoping to soon. Outstanding people. Apparently they are doing makos and blues also. Not sure if that meets your definition of artificial but...