Checking the Pool Temp after Closing
Check out the Pool Temp this Winter
The best way to check the pool temperature in the winter is to use a laser temperature checker.
Most standard pool thermostat can't handle temperature readings below 50-degrees. I have found that you'll likely get false readings.
The most accurate reading is using a laser thermometer.
Etekcity Lasergrip 774 Non-contact Digital Laser Infrared Thermometer is one such product that will give you a more accurate pool temperature reading. Yes, you can get accurate water temperature with a laser thermometer! This works well because you just need a little space to put the last dot in the pool.
Why Check the Temperature after Closing?
There's no real reason to check the temperature after closing. It's more for entertainment purposes. It's also interesting to find out what the pool temp is on the coldest day of the year.