It turns out that despite all of the rain we get here in Seattle, rarely do we get "significant" snow on Christmas day. In fact, we haven't had more than 1" of snow on the ground in the last 17 years. Oddly, December is one of our most precipitatious1 months, but we get enough ambient heat and temperature damping from the Puget Sound (and associated moisture in the air) that it just doesn't get cold enough to keep all that much snow on the ground for very long.
And that's just fine by me, really. I'm all about water and snow falling from the sky, but it bothers me least when it doesn't collect on the ground.
1 absomentularifically precipitatious

oh so rainy,Im going to go sunbathe!
But it's snow!