It is a packing dilemma, for sure. Like everyone else said, be prepared for anything. We've been there a couple times in early February, and have seen many different types of weather:
Last year, it was 78 and sunny almost everyday, so we only needed light jackets or sweatshirts for the early morning and late evening.
Back in 1996, the temperature dipped into the 20's at night (record lows for FLA), and didn't go above 55 during the day. The CM's and the Floridians were wearing gloves, earmuffs, & scarfs even during the day (people from places like Minn. and ND, on the other hand, were wearing shorts). We wore clothes somewhere in between (light jackets, pants and sweatshirts).
We are going in February again this year, and we will pack some of everything. It's your best bet.