For the past 3 years (2012, 2013, 2014) I've made a solo trip in February, leaving before the weekend of Presidents Day. (I do believe I have been there on your birthday all 3 times!) For next year, I've flirted with April, but honestly I will probably end up doing February again.
As far as I'm concerned, there are only 2 negatives about February: Splash Mountain will probably be closed, and I always worry about winter weather at my home airport.
On the plus side: February before Pres Day weekend has had about the lowest rates of the year, and I think there are usually at least some discounts going on (I had a great Disney discount on BC in 2012, used
AAA discounts on POFQ because Disney doesn't discount that one much). Crowds have been very manageable, even with Mardi Gras falling during my trip in 2013.
Weather can be hit or miss, but I've always had at least a couple of nice days (and have seen plenty of people in the pools). 2012 had two super-cold mornings, but the sun was out and the afternoons warmed up, then the rest was beautiful. 2013 was perfect first-to-last. 2014 had two cool days that dripped rain off and on, but the rest was beautiful. As long as you're going to be there more than 2 or 3 days, you should catch at least some pleasant weather.
That's just my experience, but take it for what it's worth.
