Other than the most crowded times (Christmas, Easter, etc.), summer is the WORST time to really enjoy WDW. The only plusses are longer park hours, more daylight, and late-night swimming. Being from the northeast, nothing beats escaping the cold from November through April. You need a bit of luck if you're going in January or February though. Although the normal high temps are around 70 degrees, you can get a cold spell. The mid-days are still usually OK with a heavy sweatshirt or jacket, but the mornings and after-dark can be pretty cold. But that's the exception, not the rule. Sign me up for comfortable temperatures and smaller crowds!