You will be fine. Most likely there won't be any hurricanes at that time. I will be flying to Florida on the 22nd.
If you are on a cruise during a hurricane the Captain will not take any chanches and you will be safe.
Carnival Liberty New Year's Eve 2007
Liberty of the Seas 5/2008+11/2009
Allure 1/16/ 2011
Independence of the Seas 12/29/2013 Booked!