Rain on Ferenginar.
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Rain is precipitation of liquid from the atmosphere which falls to the ground. It is caused by condensation of the liquid when the humidity passes the saturation point of the air it is in.
On most Class M planets, rain is in the form of liquid water. On Class M planets nucleogenic particles are necessary to produce rain; without them a planet would be incapable of producing any rain at all. Some forms of technology are capable of destroying nucleogenic particles. The Caretaker's race caused this damage to the Ocampan atmosphere, and as such it had no rain. (VOY: "Caretaker")
Planets of other classes sometimes have rain composed of other compounds. An example is the class N Venus, which rains sulfuric acid. (citation needed • edit)
Ferenginar is well known for its near-constant rain. Because of the extremely rainy climate of their homeworld the Ferengi have 178 different words for rain in all its various forms. They also have no word for "crisp," as all food on Feringinar becomes soggy very quickly. (DS9: "Let He Who Is Without Sin...", "Family Business", "The Magnificent Ferengi", "Valiant") In 2375, an accident at a power plant there produced toxic rain. (DS9: "The Dogs of War")
On Banea, in the Delta Quadrant, rain storms are called "cloud bursts." (VOY: "Ex Post Facto")
Many planets, such as Caldos II and Risa, had weather modification networks which, among other things, controlled rainfall. (TNG: "Sub Rosa"; DS9: "Let He Who Is Without Sin...")
One of the hosts of Dax helped the Federation deliver rain-inducing technology to Kelton IV, ending the drought on the planet. (DS9: "Dramatis Personae")
In 2373, Michael Eddington lamented the lack of rain and too much of it on a planet in the Demilitarized Zone. (DS9: "Blaze of Glory")
In an alternate timeline in which Benjamin Sisko suffered temporal displacement, Melanie visited Jake Sisko on a particularly rainy night in 25th century New Orleans. (DS9: "The Visitor")