Dissolved oxygen is more important that water temp. Yes, the cooler the water the more D.O. is possible but in most cases it seems 60 degrees is about max for comfort in the right situation for that 60 deg water to hold the DO required.
My guess would be no. My pond is deeper, with cooler water (below 65) but the DO is too low even with aeration but I'm not rolling all of the deeper water to the surface so I'm not mixing the upper layers to warm up the entire depth-on purpose.
If rolling the entire pond, the temp will be very similar top to bottom so the lower layers will be the same as the upper-maybe not 85 as the surface is, but likely not but a few degrees less.
