Galactic Patrol by E.E. Smith

Judged by any Earthly standards, the planet Trenco was -- and is -- a peculiar one indeed. Its atmosphere, which is not air, and its liquid, which is not water, are its two outstanding peculiarities and the sources of most of its others. Almost half of that atmosphere and by far the greater part of the liquid phase of the planet is a substance of extremely low latent heat of vaporization, with a boiling point such that during the daytime it is a vapor and at night a liquid. To make matters worse, the other constituents of Trenco's gaseous envelope are of very feeble blanketing power, low specific heat, and of high permeability, so that its days are intensely hot and its nights are bitterly cold.

At night, therefore, it rains. Words are entirely inadequate to describe to any one who has never been there just how it does rain during Trenco's nights. Upon Earth one inch of rainfall in an hour is a terrific downpour. Upon Trenco that amount of precipitation would scarcely be considered a mist; for along the equatorial belt, in less than thirteen Tellurian hours, it rains exactly forty-seven feet and five inches every night -- no more and no less, each and every night of every year.