Tip's sun angle works great on the south side of structures. But the north side of my house is icy tundra. What makes it worse is that's the side of my property where the drainage occurs, so it's layer upon layer of ice build up on the sloped driveway, with very little melting during the day. I often wonder why people don't consider such things when they design homes (or why people like me buy those homes).
Give me one more blizzard (ice-FREE), or send me into May.