March thru April are nice months to go to the World, but it's Spring break for alot of kids and it's somewhat crowed. I like late October, early November. On my last trip we stayed October 28-November 11, some nights we ran the air conditioner, some nights we ran the heater. The days were cool and it would warm up nicely. Early December is the same way, cool mornings, somewhat warm during the day then cooling down for the night. Sometimes a cold front comes through and it gets chilly for a few days but overall its warm, not steaming hot. Check the weather chanel webpage for Orlando temp. averages, some disney pages have this info also. Have a great stay.