All the ole' timers at home use to say that if you see a sundog in the sky that some kind of weather was coming whether it be rain or snow depending on what time of year is is. Does this have any truth to it?
Yes! A sundog can be seen when high, thin cirrus clouds move in before a storm system. The sun's rays are refracted through the ice crystals that make up these clouds and a prism of color can be seen on either side of the sun. The same thing happens at night when the moon is barely visible through the high clouds... it looks like a ring around the moon.