Ryan:
I had 83�F surface temps last week, with the water at 8' depth 67�F-68�F. I'm running the aerator at night, when the air temps are below 70�F. So far the trout are doing well. There is a high water table tho, and with a sandy pond bottom/sides I think I have a lot of groundwater flow thru the pond, keeping the pond lower water levels cool. It'll be interesting to see if I can get them to over-summer!
I'm really amazed at how fast they grow when they are fed good food! Mine are showing the same growth rates as your trout, but mine are RBT/Golden morphs.