Winter perfect for Sundogs | Weather
Why does the Sun look so unusual on partly sunny Winter days? Sundogs and halos are quite common and are beautiful to watch. Ice crystals falling in cirrostratus clouds show up as sundogs and halos.
Sundogs are visible when the sun is near the horizon and on the same plane as the observer along with the ice crystals. Kim Crosby's picture from Greenville servers as a perfect example. As the sunlight moves through the ice crystals, it is bent by 22-degrees before coming to our eyes. Very similar to what happens when viewing halos and rainbows.
Red is the most common color that we see.