We've already seen some beautiful astronomical phenomena this year, from the northern lights to the Leonid meteor shower that's about to peak. Add the December full moon, the final supermoon of the year, to the mix.

When is the December full moon? What makes it a supermoon? How did it get its name? Here's more on the December full moon.

When is the December 2025 full moon?

The December full moon, known as the cold moon, will reach peak illumination on Thursday, Dec. 4, at 6:14 p.m. ET, according to Space.com .

Is the December full moon a supermoon?

There are three supermoons in 2025, with two already visible in October and November.

December's full moon will be the third and final supermoon of the year.

When will be the best time to see the December supermoon?

The best time t

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