Ok, Had my pool refinished from plain white plaster to Tahoe blue exposed aggregate finish. Last year July-August temps were approx 78 degrees at best in the dead of summer. At this time of year it was about 76-78
I used the exact thermometer and not one other thing changed and temps are
81 on same thermometer and 82.6 on new digital one. Pool is noticeably warmer. No it isn't a hot tub but less of that shock when you first get in. I am going to assume maybe a degree or more will be gained when in the middle of summer like last years above temps.
So scientist, calculations, speculation, etc all I can do is report that for whatever reason my pool has seen a nice increase in temps. Figured I would report back for reference. I will update in late July.