In England, it's unfortunately not often that it snows heavily on Christmas Eve/Day, as we usually get most of our snow between January and March. However, I can remember a couple of occasions when it did, which were very nice!
I think the ideal Christmas Eve/Day weather is a full-on blizzard. Nothing like sitting in front of the fire indoors with the Christmas tree lighting up the room looking at the outside world buried under feet of snow, with icicles on the rooftops, snowmen in front of every house, and maybe, just maybe, a little robin hopping around in the snow! Haha, that's what Christmas weather should be like!
How likely do you think a white Christmas is in your area?