Christmas lights are actually best when the ground is covered with snow. The white snow reflects the light, making for the traditional winter wonderland. But, the truth is that it is not uncommon for London, Ontario, to have a green Christmas. We usually get some snow before Christmas, maybe even a lot, but it is not unusual to have it all melt away by the 25th. There's a good reason why the small ski hill in London makes snow every night when possible.