The NASA Phoenix Mars Lander has identified snow falling from Martian clouds. A Phoenix scientist says, "Nothing like this view has ever been seen on Mars."
NASA Mars Lander sees falling snow, soil data suggests liquid past," that Phoenix has detected snow falling from about 2.5 miles (4.2 kilometers) above the landing site of the spacecraft.
The snow is falling from Martian clouds within its atmosphere The NASA website of the Phoenix Mars Lander mission contains more information.
However, Phoenix has shown that the snow is vaporizing before it reaches the ground.