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sky cover

noun
  1. the amount of the sky that is covered by clouds, fog, haze, smoke, or the like, usually expressed in tenths of the total sky.
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Origin of sky cover

First recorded in 1955–60
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Examples from the Web for sky cover

Historical Examples of sky cover