rainfall
n. US //ˈɹeɪnˌfɔɫ// UK //ɹˈeɪnfɔːl// rain·fall
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1 amount of rain (n.) B1 Intermediate Sciencethe total amount of rain that falls in a place during a month, year, or storm.
the quantity of liquid precipitation measured over a specific duration or within a particular geographic region.
ExampleThe heavy rainfall last night caused some minor flooding in the garden.
ExampleAverage annual rainfall in the tropical rainforest can exceed two thousand millimetres, sustaining a diverse ecosystem that relies on consistent moisture throughout the year.
From rain + fall.