There is, in fact, a water cycle not only on Earth, but Mars as well. There are discrete cloud layers above the surface that appear to be composed of water, ice, and characteristics similar to hazes that produce "diamond dust" precipitation in the continental Antarctic of Earth. The hazes may play a key role in the seasonal water cycle of Mars.
Kahn, R. (1990), Ice haze, snow, and the Mars water cycle, J. Geophys. Res., 95(B9), 14677–14693, doi:10.1029/JB095iB09p14677.
Kahn, R. (1990), Ice haze, snow, and the Mars water cycle, J. Geophys. Res., 95(B9), 14677–14693, doi:10.1029/JB095iB09p14677.