How can I translate the 'Cloud Cover' data on your site?

Cloud cover (out of 8) means the fraction of cloud cover on average for any given month. Look at it like it's a pie. If you see an average cloud cover of 4 (which means 4 out of 8), half the sky is covered with clouds. If you see an average cloud cover of 2, it means that 2/8th of the sky is covered on average (about a quarter of the sky)

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