Hi youngster!
There is nothing at DLR like the crowd predictors site for WDW. The demand is just not there.
Some might jump to the conclusion that it is because DLR is so much less popular than WDW. There is some truth in that because DLR draws at most half the people than WDW (two parks vs. four).
But an even bigger reason is the crowd mix. WDW draws 85% of its visitors from outside its geographic region and most of those are there on longer vacations. Hence there is a high demand for crowd prediction far in advance.
DLR is situated in a densely populated area (20 million people in SoCal) and draws only 30% of its visitors from outside SoCal. So it is more of a "locals" resort. Most of those visitors are not on vacation at DLR and are in fact day trippers. And DLR has 800,000 AP holders of which some 90% are from SoCal.
Bottom line here is that most SoCal day trippers do not care for crowd planning and just go to DLR whenever they decide to go and deal with whatever crowds happen to be there.
With all that said, here are some trends you can consider:
1. DLR is more of a locals park and in general has more lumpy attendance than WDW. Weekends and holiday weekends tend be more crowded than weekdays and the difference tends to be larger than you would find at WDW.
2. DLR's SoCal AP holders can really swing attendance at certain times of the year. See "The Psychology of the DLR Annual Pass Holder"
http://www.disboards.com/showthread.php?t=2244322
3. You can use historical DL park hours as an indicator of expected crowds. Here is the guide:
8AM-Midnight - High crowds
9AM-10PM - Moderate crowds
10AM-8PM - Light crowds
4. DLR off-season crowds have surprised people in recent years for being busier than anticipated for some visitors. Even so, there are more downsides to visiting DLR than WDW in off-season. See "What You Should Know About Off-Season at DLR"
www.disboards.com/showthread.php?p=18462889
HTH