The final full moon of 2025 is here, and it’s the last of three consecutive supermoons that make for a stunning sight in California’s night sky.

The December full moon, known as the Cold Moon, is on Thursday, Dec. 4. But a moon will appear full for a couple of days, said NASA , so you do have some time to look up at the sky.

What is a supermoon?

A supermoon is when a full moon is at or near its closest point to Earth, a point known as the perigee, said NASA .

When the moon reaches perigee, it’s about 226,000 miles from our planet (although the exact distance can vary), said NASA , making some supermoons closer or farther than others. That’s still extraordinarily far from us but nonetheless has a visual impact: the full moon appears “especially large and bright in the sky,” N

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