On Texas Christmases - Part 2

UPDATE #1:

The water temperature is up to 66 degrees at 10:20 a.m.
Only 24 degrees more to go!

UPDATE #2:

The water temperature is up to 73 degrees at 1:30 p.m.
Only 17 degrees more to go.

(I confess I'm a little concerned about the physics of what I'm attempting here. There is a lot of surface water exposed on our pool, the air temperature outside is in the high 40s to low 50s, and from time to time Old Man Winter is dumping the cold water of rain into the pool by the tenth-of-the-inch. Time will tell whether our heater is up to the task. We may have to just focus on warming up the spa part.)