What is Clear?
Observation of the sky from the observer's location where there are no clouds, and there is no obstruction to visibility. Clear sky. In meteorology, this term is also used when the cloud cover is less than 1/8 during the day or at the observation hour.
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Observation of the sky from the observer's location where there are no clouds, and there is no obstruction to visibility....
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The state of the atmosphere when it contains the maximum amount of water vapor possible at a given temperature and pressure.
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