You can go to touringplans.com. You will need to pay a small subscription fee or buy their book. They have been fairly accurate. I read another post they really under estimated and over estimated this April - May (I think I remember the months right).
A general rule of thumb you can use for trip planning is this:
1. Weekends are (almost) always busier than weekdays by default.
2. Traditional Holiday and Vacation (Summer, Easter, Spring Break, Thanksgiving, Christmas-New Years) periods increase crowds, sometimes to exceptionally high levels
3. Whatever park has morning Extra Magic Hours will be busier than the other parks that day. This doesn't always hold true if the park has evening extra magic hours (which in my opinion are more fun anyway).
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