Went this year Mar 1-8, the week before our March Break - it was busier than I expected because of dance competitions and other breaks for southern states - and towards the end of the week it got really busy. The weather was okay, only wore shorts one day, the rest of the time was capris or jeans with layers, and definitely needed sweatshirts at night. Still, not a drop of rain all week except about 5 min of sprinkles one afternoon, so it was a really nice time with my daughter (her surprise sweet 16 trip!). As far as crowds and weather, I usually say 'who cares, I'm in Disney World!' When you live in Canada and get to go south in March, even a cool day is better than at home!