Brook, we have taken 3 trips in March, 2 the 1st week and 1 the second. Weather can be all over, and corwdes dependin on schools spring breaks and when Easter falls.
In 2007 our trip was much cooler. The last day did get to high 70's, but we left early that day. I still wore shorts most of the trip, but also mostly wore a sweatshirt too. The 1st night was so cold I had on a winter coat. The crowds were very high that trip too, but we also did alot of EMH days.
The 2008 trip was the best crowd wise. Easter was in March that year, which made alot of schools spring break earlier, so we missed that, and then the ones that fall over Easter were coming in about the time we were leaving. The weather was pretty good too. Mostly just sweatshirts for evenings. in 2009, we went the 2nd week and the weather was hot! Crowds were pretty doable. Some days were busier, and since we don't park hop, we were stuck in the park if it was busy. WE also learned to avoid most EMH days.
My parents went in late Feb (I think) this year, and it was very chilly for them. My mom said the wind was really strong.
I think Tim went the 2nd week of March this year, and his weather was chilly too. It can go either way, and it seems liek the last few years FL has had some unseasonable cold spells.