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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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Question Number: 154 in Climatology - Atmosphere, Winds, Humidity, Clouds, Rainfall in above course in App.