No, 365 days open a year
No, they are open. It's just cooler weather, possibly from the 40's to 60's. Depending upon what parts of the Country you're from...but if you're from a place with snow you are already leaving in warm clothes. Just pack the appropriate clothes for warmer weather than you came from.
No. They may (rarely) close due to very severe weather.
The Disney parks are open 365
No, winter is very mild in Florida.
They do not but there water parks do sometimes.
The parks do not close.
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