We've been twice in February now and it's my favourite time of year to go. The parks are as quiet as I've ever seen them- we went as a party of 4 a year or so ago and found we didn't need any ADRs and still did everything we wanted to do. The rides are pretty much walk-ons apart from the biggies. Weather wise it's unpredictable. I'm a Brit so pretty used to the cold- February weather in FLA felt warm to me, but definitely not hot. We managed with shorts in the daytime but had to resort to jeans at night. One day, however, we wear caught short and ended up having to buy sweaters from Discovery Cove we were so cold.. so I'd always carry some sort of lightweight jacket. Rain-wise we've always been really lucky in Feb and hardly experienced any! I think it's a lovely time to go!
HTH..
Rach xx