We were there last year 12/14 to 12/19, we missed the heavy rains from the week before, but it was cold the first few days, especially at night. But being from PA we were prepared, thank goodness we took our winter coats.
Saturday the 14th the MK was mobbed! I think probably because there had been so much rain the days before. We got to the park around 1:00 tried to find a place to eat and everything was packed, we got hot dogs from Caseys but had to sit on the curb to eat. We were able to do the Haunted Mansion and one other ride before we decided to get at spot for the 3:00 parade. After the parade we opted to leave the park until later that night because there were 2 showings of Spectro that night, and we were going to
MVMCP later in the week.
We had dinner at the Poly, saw the fireworks from Ohana, and then went back to the Mk for the 2nd parade. That worked out great, it was not as crowded as earlier in the day, we got a great spot near the railroad station, and then just bolted after the parade was done in our area. It started there so we were able to beat the crowds.
The remainder of the week the other parks were not crowded, waiting times were 5 minutes most times, 20 minutes tops for the rides like Test Track, RNR etc.
This year, I am going in September and I am going to start in another park during the day, but go in the evening for Spectro, and save MK for a week day.
One good thing about December is the MVMCP, we were able to do a lot of rides during the party as well as see the Christmas parade and some of the shows.