Meteorology, the study of the atmosphere, including weather and climate, dates back to ancient times. In fact, In 340 B.C.E. Aristotle titled his book on weather Meteorologica. Throughout history, notable scientists such as Galilei Galileo, Blaise Pascal, Edmund Halley and Benjamin Franklin all studied aspects of meteorology. Nature produces unusual weather conditions, including thundersnow, fallstreak holes, sunshowers and many others. Here are five incredible weather phenomena.