Hi So!
Welcome to the Disney Parks Moms Panel and thanks for your question!!
My answer is always ANY weather is perfect weather when you are at
Walt Disney World!!
I am not a huge fan of the heat, so I prefer to visit when the temperatures are a little on the cooler side (like late fall and winter), and that is exactly what you will find when you visit in February.
January is typically the coldest "average" month in Florida and July is typically the hottest. February temperatures run between an average low of 49 degrees F (evenings) and an average high of 73 degrees F (daytime). I find this weather perfect but most guests feel more comfortable with a light sweater or sweatshirt in the late day and evenings.
No matter how you slice it, Walt Disney World is ALWAYS cool in my humble opinion.
I hope this helps and I wish you a Magical trip!!
Chris