The full moon in December 2025 occurs on Thursday, 4 December 2025, with the exact moment of fullness at 23:14 UTC.

Exact timing

  • Peak fullness: 4 December 2025 at 23:14 UTC.
  • In U.S. Eastern Time, that corresponds to about 6:14 PM EST on 4 December 2025.
  • The Moon will appear essentially full for a couple of nights, roughly 3–5 December 2025 , even though the technical peak is on the 4th.

Extra details

  • This December full moon is commonly called the Cold Moon, reflecting the onset of colder weather in the Northern Hemisphere.
  • The 4 December 2025 full moon is also classified as a supermoon , meaning it appears slightly larger and brighter than an average full moon because the Moon is closer to Earth in its orbit.