How to Measure Cloud Cover

Clouds are usually measured on oktas (0 oktas = clear sky, 8 oktas = total coverage). 

Students can do basic calculations by dividing a mirror into multiples of 8. 

They can then count the number of full or partial squares – convert to oktas e.g. if 6 out of 16 squares are filled then cloud cover is 3 oktas.

Measuring Cloud Cover

Watch the following videos:

Cloud Cover Measurement