I just put a 12 ml solar cover (my first cover ever) on my pool about 5 days ago. I live in Florida, so while it is miserably hot & humid here every day, we haven't had much sun during the past week. We have been getting sun in the am from like 8-11 or 12 noon, then clouds the rest of the day. Also, it's been raining every night since I have been using the cover. My question is this; the day I added the cover, the temp was 82 degrees, today I checked the temp for the first time in five days and was shocked to see that the temp was STILL 82 degrees...had not moved up even 1 degree. Could the rain water and lack of sun be causing the pool water to stay the same? I was so excited to use this cover because I thought "finally, pool water that is pleasant to get into"...so disappointed.