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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Temperature scale, abbreviated as °C, found by accepting the freezing point of water at one atmospheric pressure as zero...
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The lowest level of a given cloud or cloud layer in the atmosphere, relative to the observer's position above the ground.
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A measurement determined by the wave lengths and sea conditions caused by the effect of wind, and by the movement of tree...
A type of low-altitude cloud that forms in uniform layers, often covering the entire sky and producing overcast conditions.