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Cloud Cover Observation Measurements

Publisher Climate Services, Bureau of Meteorology
Created: 17 Sep 2021 𝕏
Cloud cover observations are measured in oktas (eighths). The sky is visually inspected to produce an estimate of the number of eighths of the dome of the sky covered by cloud. The presence of any trace of cloud in an otherwise blue sky is recorded as 1 okta, and similarly any trace of blue on an otherwise cloudy sky is recorded as 7.
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The Bureau of Meteorology use this vocabulary to provide definitions for cloud cover measurements.