What's the difference between 'Partly Sunny' and 'Mostly Cloudy'?

Partly sunny? Or Mostly cloudy? Sounds like the can be interchangeable but the National Weather Service has specific definitions on each term used to describe cloud cover.

Intro Guide Part One: Mostly Sunny vs Partly Cloudy – janesweather

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Heather's Weather Whys: What's the difference between partly sunny and partly cloudy?

What's the difference between 'partly sunny' and 'mostly cloudy'?

mostly cloudy partly cloudy sunny intervals hazy sunny ice storm

Days of Sunshine

Tim Leishman (@Leishman82) / X

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Intro Guide Part One: Mostly Sunny vs Partly Cloudy – janesweather

Matt's Weather Spot: Partly Cloudy vs. Partly Sunny

What's the difference between partly cloudy and partly sunny?