Snow makes excellent natural lighting. Every night I walk my darkbrown dog into the park nearby, and even on the open field she is concealed by the dark. But the weather turned a few days ago and we were lucky to get plentiful snow. Even if there's no moon or stars, the snow lights everything from the bottom up and the little landscape and its shapes are easier to make out - the hedges, the basketball net, the swings and trees. And of course the dog is easier to find. And she loves snow.
I thought I remembered a Hawthorne story where light shines from below a town square (?), creating an ominous atmosphere. But the snowlight isn't ominous, just pretty, and reveals everything is where it's supposed to be.