I would also look at the statistics if it was available. I think as for all such entertainments, the peak of attendance is all seasons except for summer, when many travel, have fun on the street, etc.
If you follow the logic, then in cities where many tourists traffic grows in the summer, but does not fall.
Yes you are right. In the resort towns such parks will be especially popular. Even given the high competition in the entertainment industry, I assume that there will be a huge number of visitors during the holiday season.