Rain

Rain was precipitation of liquid from the atmosphere which fell from the clouds to the ground. It was caused by condensation of the liquid when the humidity passed the saturation point of the air it was in. On most class M planets, rain was then produced in the form of liquid water. 
Many planets, such as Caldos and Risa, had weather control systems which, among other things, controlled rainfall. (; )
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. ()
== Characteristics ==
=== Heavy rain ===
Regions that experience an abundance of rain that produce think lush forests were known as rainforests.
In meteorology, rain storms were heavy rain storms, often associated with thunderstorms. 
On , in the Delta Quadrant, rainstorms were called cloud bursts. After Tom Paris and Lidell Ren were caught in a cloud burst, Ren exclaimed of being "completely soaked," while Paris complained that "There must be a centimeter of water in my boots." () 
Ferenginar was well known for its near-constant rain. Because of the extremely rainy climate of their homeworld, the Ferengi had 178 different words for rain in all its various forms, including "glebbening". They also had no word for "crisp," as all food on Ferenginar became soggy very quickly. () 
=== Drought ===
A lack of rain was known as a drought. 
On class M planets nucleogenic particles were 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 's race caused this damage to the n atmosphere, and as such it had no rain. ()
In 2373, Michael Eddington lamented the lack of rain and too much of it on a planet in the Demilitarized Zone. ()
=== Pollution ===
Acid rain was a common by product of rain mixed with pollution. 
In 2375, an accident at a power plant on Ferenginar produced a toxic electrostatic cloud that hanged over the city, that according to Grand Nagus Zek, caused "a frigging mess," including poor off-world communications. ()
== Appendices ==
=== Background information ===
According to an early version of the script for the episode , one of the hosts of helped the Federation deliver rain-inducing technology to Kelton IV, ending the drought on the planet.
=== External link ===
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de:Regen
Category:Meteorology