An Okta is a unit of measure to measure cloud cover.
Cloud cover is how much cloud there is in the sky.
A bit like a centimetre, the bigger the number of Oktas the more
cloud there is, the more centimetres, the longer the object being
measured.
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One Okta = One eighth of the sky covered by cloud.
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Meteorologists measure the amount of cloud cover in the sky
using a unit of measurement called an "okta." Basically, one okta
is one eighth of the sky that is covered in cloud. The severity of
cloud cover ranges from zero oktas to eight, with zero being a
completely clear sky and eight oktas being complete cloud
cover.
It can be fun to observe how the cloud cover will differ from
day to day and even from hour to hour. What do you think is
responsible for these changes