We spent five days floating in the pond. It was too hot to do much else. Not getting any cooler. I didn’t get a temp, but the surface was pretty warm. Down a foot or so, it was nice and cool. Four grandkids kept the water stirred up.
12 yr old pond, 1 ac, 15' deep. RES, YP, GS, FHM (no longer), HBG (decreasing), SMB, and HSB (only two have been seen in 5 yrs) I think that's about all I should put in my little pond. Otter attack in 2023.