Hi Malgorzata,
The awesome water parks at Walt Disney World --
Typhoon Lagoon and
Blizzard Beach -- are open year-round. When one of the parks is refurbished, the other stays open so that guests always have at least one water park option.
Though the water also is heated year-round, on rare occasions in the winter, the water parks may close because of cold temperatures.
The most recent refurbishment was just completed at Typhoon Lagoon. The park's newest waterslide,
Miss Adventure Falls, opened earlier this month.
Thanks for stopping by the Disney Parks Moms Panel with your question, Malgorzata. Please let us know if we can help in any other way as you make your final plans. Enjoy!
Wilma