Just for comparison sakes, I checked my pond temp [surface] at 7:15 AM - 79 degrees F. At 3:00 PM - 81 degrees F. This is an inground pond 2 ft to 3 ft deep, under oak canopy. East side of house. Latitude 28.76 I was planning to check it again around 6PM but it's starting to rain, so that would probably be a false reading.