For fans of White Christmases in the Delaware Valley, this post may not be for you. However, if you like snow you generally need at least some cold air around or nearby (although Snowtober proves that dynamics can win in the right environment!) and it does look like we have a shot of having a cold blast of some sort on or near Christmas.
The storm that triggers this on the models would bring rain to the region on Christmas Eve night -- it would certainly not be a White Christmas if the GFS was right! However, it would help usher in a shot of cold that will certainly reinforce the thought that it was winter around here.