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By Newsweek Editors

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What is the difference between "partly cloudy" and "partly sunny" weather?

It depends on whether your weatherman is a "glass is half-empty" or "half-full" kind of guy. Art Kraus, a meteorologist for the National Weather Service, says, "In the grand scheme of things, the two terms mean about the same thing." Officially, both "partly cloudy" and "partly sunny" refer to when clouds cover 31 percent to 69 percent of the sky. While there's no hard-and-fast rule, meteorologists tend to only use "partly sunny" during the daytime, whereas "partly cloudy" can be used both day and night.

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