What is the unit to measure the amount of visible sky that is covered by clouds?

Q. What is the unit to measure the amount of visible sky that is covered by clouds?
Answer: Oktas
Notes: An Okta is a unit of measurement used to describe the amount of cloud cover at any given location such as a weather station.
Clear sky is measured as 0 oktas.
An overcast or grey sky is measured as 8 oktas.

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