A cloudy sky indicates that the sky is full of clouds, making it impossible to see the sun. According to the provided reference, a cloudy sky can tell you several things:
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Sun Obscured: You can't see the sun. This is the most direct indication.
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Outdoor Activities Affected: A cloudy day is not ideal for activities like going to the beach or stargazing.
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Possible Rain: A cloudy sky can suggest that rain is on the way.
In essence, a cloudy sky signifies a specific atmospheric condition, impacting visibility and potentially foreshadowing precipitation.