The December full moon in 2025 occurs on Thursday, December 4, reaching its peak illumination at about 23:14 UTC.

Date and time

  • The December full moon, often called the Cold Moon, is on December 4, 2025.
  • It is at its fullest around 23:14 UTC (evening of December 4 in Europe and late afternoon to evening in the Americas, depending on time zone).
  • The moon will look “full” for a few nights, roughly from December 3 to December 5.

Extra context

  • This December full moon is also classed as a supermoon, appearing slightly larger and brighter than average.
  • Traditional names for this December full moon include Cold Moon and Long Night Moon, tied to the colder weather and long winter nights in the Northern Hemisphere.

Information gathered from public forums or data available on the internet and portrayed here.