We just got back, we went Feb 3-7. It was beautiful weather. The 6th it got kinda dreary and cool but all the other days were perfect. It would hit 80' but it wasn't a HOT 80', it was very pleasant. This is the second year in a row for going the first week of February.
Also is is a great low crowd time. There were a few tour groups but they only effected us once, at a Mickey greet. Also is a cheerleading completion but we never saw any of them. We stayed at Pop Century, buses were quick and pretty light, we never had to stand.
We tend to go weekdays.
Only downfall is Splash has been closed that week both years.