What time is the full moon in December 2025?

Maximum illumination falls on 4 December 2025 at 23:14 UTC. That is a single instant worldwide, so your local clock time depends on your offset from UTC — the Moon looks essentially full for about a day either side.

Why is it called the Cold Moon?

The long-night moon of deep winter. The name comes from Mohawk tradition. Other cultures use different names for the same phase — they are labels laid over one physical event, not competing claims.

Do I have to do the ritual on the exact day?

No. The phase is a marker, not a deadline. Working within a day or two either side is normal practice, and a ritual you actually complete beats a perfectly timed one you skip.

Cold Moon · Gemini

Full Moon December 2025

4 December 2025 at 23:14 UTC

The Cold Moon of December 2025 peaks on 4 December 2025 at 23:14 UTC, in Gemini. A full moon is the point of maximum illumination — the Moon opposite the Sun, the whole disc lit. Traditionally it marks culmination: what you started at the new moon is now visible, including the parts you would rather it weren't. It is a releasing phase, not a starting one.

Date	4 December 2025
Exact time	23:14 UTC
Zodiac sign	Gemini (Air, Mutable)
Traditional name	Cold Moon
Distance from Earth	357,611 km
Supermoon	Yes — near perigee, appears larger and brighter
Theme	curiosity · language · exchange

What the December full moon means

A full moon in Gemini surfaces everything unsaid. Conversations you have rehearsed for months tend to happen now, often faster than planned. Expect information to arrive from two directions at once.

Gemini is a mutable air sign ruled by Mercury. Air signs work through language. Say it, write it, or send it — the thought does not finish inside your head.

The release edge this month sits with the noise you keep on to avoid your own thoughts. That is where the friction usually shows up — not as a crisis, more as something you have been carrying that suddenly feels heavier than it is worth.

A ritual for this moon

Write the message you have not sent. Do not send it yet — leave it overnight and read it once in the morning. Gemini's gift is precision, and precision needs a night between the feeling and the sending.

Journal prompts

What have I been explaining instead of asking?
Which story about myself have I told so often I stopped checking it?

The Gemini tone echoes the Arcturian lineage — if that resonance is familiar, the resonance journey mirrors your own answers back without forcing a verdict.

Where this sits in the 2025 cycle

This is one of 12 full moons in 2025. The 2025 moon calendar lists every one with exact times and signs. The previous full moon was November 2025. The next is January 2026.

Common questions

What time is the full moon in December 2025?: Maximum illumination falls on 4 December 2025 at 23:14 UTC. That is a single instant worldwide, so your local clock time depends on your offset from UTC — the Moon looks essentially full for about a day either side.
Why is it called the Cold Moon?: The long-night moon of deep winter. The name comes from Mohawk tradition. Other cultures use different names for the same phase — they are labels laid over one physical event, not competing claims.
What sign is the full moon in?: It falls in Gemini, a mutable air sign ruled by Mercury. Air signs work through language. Say it, write it, or send it — the thought does not finish inside your head.
Do I have to do the ritual on the exact day?: No. The phase is a marker, not a deadline. Working within a day or two either side is normal practice, and a ritual you actually complete beats a perfectly timed one you skip.