Does it rain on mars?

So when it gets cold, Mars has precipitation. However, this precipitation most likely takes the form of frost, rather than rain or snow. The ground is likely to be colder than the air (especially on cold clear nights), and so air hitting the ground cools and the water freezes to the ground as frost. read more

There is lots of evidence that Mars did have running water on the surface at one time when the atmosphere was warmer, wetter and thicker. That means Mars would have likely supported a full hydrospheric/atmospheric cycle including rainfall. read more

Generally, Mars - 50 percent farther from the sun than Earth - is bitter cold. Its atmosphere is paper thin (1 percent as dense as Earth) and, at times, windy and dusty. There is no rain on Mars because the low temperatures and pressures mean water can only exist as vapor or ice (although it may have have rained in the geologic past say scientists). read more

But Lydia gives me an idea -- conditions could be such that minuscule amounts of rain might form, and evaporate in drier layers of the lower atmosphere -- a phenomenon known on Earth as, "virga." -- In looking that up, I see that this has in fact been observed on Mars, in frozen form -- see Source. read more