"Missing" months from valid Use Years - Why?

[that1jeff]

I know I've heard/read the reason why before, but couldn't re-find it...

Why are January, May, July and November "missing" from the available/valid Use Years? What was the original purpose of leaving those four months out? I think I remember hearing some administrative reason, maybe?

 

[CarolMN]

No one really knows except Disney. I do not remember any credible report about this on the DIS.

 

[zavandor]

Maybe January because it's the month right before contracts expire, but no idea about the others.

 

[Girlstar30]

May because it's a fabulous use year that would cover the low points seasons (may, September) and all holidays is my theory