If you’ve ever heard a meteorologist or local say it’s “Chamber of Commerce weather,” they’re not just describing a beautiful day — they are talking about a “perfect” day.

Yes, “perfect” weather is a relative term. Everyone’s idea of a perfect weather day can vary.

However, “Chamber of Commerce weather” refers to days that are so pleasant (sunny skies, mild temperatures, low humidity, light breezes) that they could be used in a tourism ad or postcard.

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It’s the kind of weather that makes you want to get outside, stroll along downtown, hit the trails or enjoy an outdoor café. Think: blue skies, 72 degrees, no wind and zero clouds.

The phrase itself likely came from local chambers of commerce, which are business organizations that often promote their cities or towns to visitors, investors and potential new residents. When hosting outdoor events, festivals or ribbon-cuttings, chambers would naturally hope for beautiful, inviting weather.

Over time, the phrase became a lighthearted way to describe the kind of ideal weather that makes a place look its absolute best, as if it were handpicked by the local business community.

Today, meteorologists, news anchors, and even tourists will drop the phrase when a location is enjoying a streak of postcard-worthy weather. It’s a compliment to Mother Nature and a nod to the charm of a perfect day.

Jennifer Gray is a weather and climate writer for weather.com. She has been covering some of the world's biggest weather and climate stories for the last two decades.