Just depends
In 1998 and 2001 the weather was great. Temps were in the upper 70's and low 80's and sunny. In 2000 it was in the 50's and 60's, dipping into the upper 30's at night. There were still people (kids) in the water though.
If the weather is near normal, you will be able to.
That was our favorite time of the year to go when our children were very young. The pools are heated and we always swam. My husband and sons would even swim on cool nights. Then they'd make a mad dash for a warm shower ! We would check in on the Sunday after Thanksgiving. In those days, all the Christmas decorations went up over night during that week after Thanksgiving. Talk about magical! Of course, in those days there were only a few hotels and one, then two parks to decorate!