Anyone who has ever lived in the North can tell you about it: snowlight. Waking from an afternoon nap I knew immediately, by the light alone, that snow was falling. Snowlight.
What's most surprising is just how bright it is. Some years back at a Midwinter's Eve bonfire down at Coldwater Spring, the ritualists went on and on about how this night, being the solstice, was the darkest night. Unconscious irony is my favorite kind. While they talked darkness, we all stood there in a night striking for its brightness. We'd had so much snow that year that one could practically have read a newspaper by the ambient light from the drifts and sky. Snowlight.
In quality and color it more nearly resembles moonlight than anything else: like the Moon's, snow's light is reflected light. But moonlight comes from a source, and snowlight is ambient. In snowlight, one immerses.
Snowlight has a certain thickness, a nearly tangible quality to it. One thinks of snow as silent, unlike rain. But the Northern ear knows that you can indeed hear snow. It's a high, crystalline ringing, all those snowflakes chiming together as they fall, in which even familiar sounds echo strangely. The same is true of the light, as it bounces wildly back and forth from flake to falling flake. Snowlight.