Unfortunately for that timing you may need to bring a mix of everything. When you are closer, you can look at the 10 day forecast to help, but it varys greatly. We have been there on Thanksgiving twice, once wearing shorts, once bundled in many layers with gloves and earmuffs, as it was 40 degrees in the morning - I think it may have been warmer back in South Jersey that day! Actually had my DH bring down DD's winter coat when we realized the temperature drop, since he and DS came a few days later that trip. We have also been there Jersey week (beginning of Nov.) and our sleep in/swim day did not work out as it was in the 60s, and we wore pants that day, but by the end of the week it was very hot and Splash Mt. felt good!