Zowie! Now this is winter! We might see lows in single digits this morning, the coldest in years. And no decent snow yet. Marie Skane in Catonsville asks, "Is there any validity to the saying, 'It's too cold to snow'?" Sometimes. The colder the air, the less moisture it can hold, or drop as snow. But if winds or mountains provide some lift, even cold, dry air will rise, cool even more, and squeeze out some snow. The biggest snows fall from moist air that's 15 degrees or warmer.