In the early 1980s, a Voyager mission discovered a curious hexagon on Saturn’s north pole. Incredibly enough, just one side of the hexagon is 8,600 miles long, or more than Earth’s diameter. The jury is still out as to why such a shape appears on the planet, but most astronomers believe it is due to a standing-wave pattern within Saturn’s atmosphere.
It was also Voyager that discovered Saturn’s finer clouds patterns. In the upper cloud layers, temperatures are around 100-160 Kelvin, or really, really cold.