(of the sky or the weather) covered with clouds; with a lot of clouds opposite clear. a grey, cloudy day. An overcast day can be dark, cold, and gloomy, or just quiet and calm. A day that's gray and cloudy is overcast, and a dull, sunless sky can also be described this way.
However, if skies are cloudy, some of the sun's rays are reflected off the cloud droplets back into space. Therefore, less of the sun's energy can reach the earth's surface, which causes the earth to heat up more slowly. This leads to cooler temperatures.
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