Large data set - Visibility, Pressure and Cloud Coverage

Question 1

What is visibility?

Answer 1

the greatest horizontal distance an object can be seen in daylight

Question 2

how is visibility measured?

Answer 2

1Dm or 1 Decametre (10m)

Question 3

How is pressure measured?

Answer 3

hectopascals (1hPa = 100Pa = 1milibar)

Question 4

what is cloud coverage?

Answer 4

how many eighth of the sky is covered

Question 5

what are the unit of cloud coverage?

Answer 5

Oktas