Wiktionary
methane rain
n. rain, in the form of liquid methane rather than water which falls on Saturn's moon Titan and creates equivalent geographical features (rivers, lakes etc.) as does normal rain.
Usage examples of "methane rain".
The regolith here was still pretty much grey-white, cleansed by methane rain.
Conceivably, therefore, the surface of Titan could consist of methane oceans and water-ice continents covered by nitrogenous-hydrocarbon soil, above which methane rain precipitated from methane clouds formed below the aerosol blanket.