December's full moon is particularly significant. Here's how to observe it.

As 2025 comes to an end, the year concludes with its last full moon, which will reach its peak on December 4. This full moon is particularly remarkable because it qualifies as a supermoon, occurring when the moon is closest to Earth in its orbit while also being fully illuminated. During this event, the moon can appear up to 14% larger and about 30% brighter than usual.

Decembers supermoon follows similar events in October and November, making it the third consecutive supermoon of the year.

Viewing the Full Moon

The moon will rise on December 4 at 4:14 a.m. Arizona time. Traditionally, the December full moon is called the Cold Moon due to the chilly weather commonly experienced during this month in many regions.

Why December's Full Moon is Unique

This full moon stands out not only as the final supermoon of 2025 but also because it occurs close to the winter solstice. During this time, the Northern Hemisphere is tilted farthest from the sun, resulting in the shortest day and the longest night of the year. In some cultures, this full moon is known as the Long Night Moon because of its timing.

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Author: Sophia Brooks