Having just spent a small fortune on winterising my walking kit and the further investment in walking spikes and an ice axe I hope it sooner rather than later. I use Metcheck.com for planning my walks, its general accuracy is first class. However, I understand from mountain rescue sources that it likely to be February before there’s any major dump of snow for the hills around Cumbria and that usually means that the Pennines get a taste. The following link takes you to the White Christmas Snow-o-Meter at metcheck; the snow charts are also quite good. If you’re in to out door activities or sports the hobbies forecast is also a good one.
http://www.metcheck.com/V40/UK/FREE/whitechristmas.asp