Above ground pool question
The only concern that I can think of is freezing; so many hours in the 20's are required to cause some freezing. It takes time to lower the temperature , then freezing require removal of a great amount of heat. Hoses will be the first thing to freeze. I had a 32 X 16 in the Chicago area and did not do much for winter ; I think I needed a new liner every other year. Many years there was about a foot of ice.  Putting in a liner was much easier than taking it down and putting it up. One year it did freeze solid ; an iceberg in the back yard.