Earlier this week NASA's Phoenix Mars Lander captured a sequence of images showing clouds drifting across the morning Martian sky. NASA composited the images into a single animation that gives you a feel for the view, which I find fascinating. Not hard to imagine this being the view out the window of your Martian homestead...

Most of the year there are only thin, high clouds of frozen carbon dioxide, but as winter approaches the atmosphere gets cold enough for water to condense and form clouds, haze, and even fog at lower levels.

Phoenix has also detected thin wisps of snow falling from some of these winter clouds, though the instrument involved was a LIDAR system that produces graphical scans of the Martian atmosphere rather than photographic images.