What is indicated by a sky coverage of “overcast” in a weather report?

A sky coverage described as "overcast" in a weather report means that the sky is completely covered by clouds, indicating a cloud coverage of 100%. This term signifies that thick clouds cover the entire sky, limiting visibility of the sun and creating a uniform gray appearance. Such conditions typically suggest that there may be significant cloud cover impacting weather patterns, potentially leading to precipitation or reduced visibility.

The other options do not accurately reflect the definition of "overcast." For example, a cloud ceiling of less than 1,000 feet pertains to ceilings and visibility that might indicate low cloud conditions but does not specifically equate to the term "overcast." Similarly, 50% to 75% cloud coverage does not meet the criteria for being classified as overcast, nor do clear skies, which would indicate no cloud coverage at all. Thus, the correct understanding of an "overcast" condition solidifies the choice of full cloud coverage, making it the accurate response.