I like the pool 85+ but this summer I've actually been trying to cool mine. Yesterday morning the surface temp was finally 78, but by the time I got home from work it was back up to 84. I couldn't believe it when the pool hit 92 last week (second time in six years). It doesn't feel good at all during the day, but it is kind of nice if you go out and swim late at night. Most of the last two weeks I was swimming near midnight with the pool around 90 and the air temp around 80-85. Very strange for Iowa, but I don't think I'll complain since the last two years I was struggling to keep the water above 80 much of the summer.

I take the thermometer out in the late summer when the nights start to cool (after July 29 here, normally) and the kids are used to really warm water. If my teens SEE the temp is 80 they will say it is too cold, but if they don't have the thermometer to look at they will swim down to about 77 before they mention it.