Temperature isn't the only factor in rainbow trout surviving. Water temps could be 60 degrees but the rainbow trout would die at a DO level of 2 ppm. Water temps could be 75 degrees and rainbow trout could survive a week if the DO level was 10 ppm. DO is just as if not more important than water temp.
My pond is heavily aerated with a solar aerator. I know trout will bite the big one fast with O2, but I was under the impression right around 70F is the cutoff as far as temps, even short term like a week. That what the trout experts tell me at least. The longer they go at 70 and above the weaker they get until floating.
