ombrology

noun

1. The study of rainfall.

   “Hints for an Essay on Anemology and Ombrology, founded partly on admitted Principles, and partly on Observations and Discoveries, recently made, on the Influence of the Planet Jupiter and its Satellites on our Atmosphere; with a Weather Almanack for 1841. By Peter Leigh, Esq., A.M., Author of "The Music of the Eye."”

   “Combined and digested, these observations give us a very intelligible view of the fall of rain that occurs over the island. Yet further multiplied and continued for a series of years, they would reduce our knowledge of the ombrology of the country to the state of definite scientific information.”