Saturn should have a hexagon shape at its northern pole
Saturn should have a persisting hexagonal cloud pattern around the north pole. The hexagon does not shift in longitude like other clouds in the visible atmosphere.
Between 2012 and 2016, the hexagon changed from a mostly blue color to more of a golden color. One theory for this is that sunlight is creating haze as the pole is exposed to sunlight due to the change in season. These changes were observed by the Cassini spacecraft.
https://en.wikipedia.org/wiki/Saturn's_hexagon
https://en.wikipedia.org/wiki/File:PIA21611_-_Saturn's_Hexagon_as_Summer_Solstice_Approaches.gif