Okay, so I live in Vancouver and it hardly ever snows here at Christmas, anyway. And the nature of climate change – which increases the likelihood of unusual weather events – means a white Christmas may be more probably now than in the past. But we have a trend and the skiers aren't going to like it.
Check this article from the Independent Online, which quotes Dr. Michael Coughlan, head of the National Climate Centre  at the Australian Bureau of Meteorology, as saying:
“One probably has to go back into prehistoric times - and way back in them - to be seeing these sorts of temperatures.”
Just to add to the record, NASA also announced that 2005 was the hottest year on record.