Everyone has a favorite time to go to Disney. What is your favorite week? Mine is the first week in June. It is warm, but not hot, usually school is still in so it is not as crowded as the rest of summer, and you can enjoy the parks and water parks.
We like the last week of January, first week of February. Weather is a little chilled, sometimes misty, but no thunderstorms. Most days get into the 70's or at least high 60's. (key word-MOST, not all.) Sometimes it is gray all day every day. Generally lines are really short. Kids are back in school and no one can afford a trip yet because they are still trying to pay off the Christmas debt. (Yeah right)
All you can do is plan your trip and hope for the best, no matter what time of year. Not everyone can win weather-wise every time. At least we have not been able to.
First week of December is my absolute favorite. You have all of the holiday decorations up at the parks and resorts and less crowds than the official 'holiday' time. Then, you don't have to deal with as much heat. Just a great time of the year to visit
We always go in August to either celebrate our anniversary (8/4) or last year for DD 1st birthday (8/21). Yes, there is smoke rising from the pavement because it's so hot, but we love it! Besides, DH teaches, so we have to go when he's off for summer.