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The December 2025 full Moon peaked on December 4 at 23:14 UTC—6:14 p.m. EST. Commonly called the Cold Moon, it was described as a supermoon because the full phase occurred while the Moon was near its closest point to Earth. The exact peak was one moment; your local date and best viewing time depended on your time zone and location.
When was the December 2025 full Moon?
The Moon reached its full phase on December 4, 2025, at 23:14 UTC. That was 6:14 p.m. Eastern Standard Time on December 4, a time also listed by Farmers’ Almanac and The Old Farmer’s Almanac. Timeanddate gives the UTC peak in its December 2025 Moon guide.
The phase itself happens at the same instant worldwide, but local clocks—and sometimes the local calendar date—differ. Convert 23:14 UTC to your time zone rather than assuming the date will be December 4 everywhere.
Why it was called the Cold Moon
“Cold Moon” is a commonly used name for December’s full Moon, reflecting cold-season associations in the Northern Hemisphere. Timeanddate also lists “Moon Before Yule,” “Long Night Moon,” and “Oak Moon.” The Old Farmer’s Almanac describes its Moon-name traditions as drawing from Native American, colonial, and European traditions.
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These names should not be treated as universal or as having one established origin: naming practices vary among cultures and communities. The name does not change the Moon’s astronomical phase.
Why December’s full Moon was called a supermoon
Timeanddate describes a supermoon as a full or new Moon that coincides with the Moon being near its closest point to Earth. It reported a center-to-center Earth–Moon distance of 357,218 km at the December 4 full phase. For comparison, the November 5, 2025 full Moon was at 356,978 km, making November’s slightly closer in that comparison.
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“Supermoon” is a descriptive label here, not a claim that there is one universally accepted distance cutoff. The figures are the distances reported by Timeanddate for those two full phases.
How the Moon’s path differed by hemisphere
The December full Moon followed a higher path across the sky in the Northern Hemisphere and a lower one in the Southern Hemisphere. Timeanddate gives meridian-passing altitudes of 75.7° in Chicago and 24.9° in Melbourne for the December 4/5 full Moon. These are location-specific examples, not forecasts for every city.
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The seasonal pattern reverses between hemispheres: in December, the northern pole tilts toward the full Moon while the southern pole tilts away. Your actual view also depends on local terrain, buildings, and the Moon’s position at the time you look.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.How and when to see it
You do not need special equipment: the Moon is visible to the unaided eye. It can appear full on the evenings around the exact peak, so the peak time does not have to match your best local opportunity to look. A full Moon is generally above the horizon through much of the night, with moonrise around sunset and moonset around sunrise; check local moonrise and moonset times, weather, and whether your horizon is clear.
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Binoculars or a telescope are optional if you want to inspect more lunar surface detail, as TIME’s viewing guide notes. They are not required to see the full Moon.
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