This is exactly when I've been the last 2 years and I'm going back around the same time in 2014. I've been pleased with the crowd levels, even this year when I was there over Mardi Gras. I basically used FP just for things like Soarin' and TSM which are going to have long lines whenever you go.
Weather can be hit or miss - it was beautiful this year, but in 2012 there were a couple of really cold mornings (in the 30s). I've yet to see a drop of any sort of precipitation on my Feb trips, though. Tip: Don't go to AK on a really cold morning if you want to see the animals; some of them won't be out if it's too cold. (Kali River Rapids was closed, too, until it warmed up some.)