Moon calendar
Moon phases in December 2025
In December 2025 the full moon falls on 4 December at 23:15 UTC, and the new moon on 20 December. Every night of the month with its phase and how much of the Moon is lit, computed from the same engine the rest of the site runs on.
The exact moments
- Full Moon
- Last Quarter
- New Moon
- First Quarter
Times are UTC. A phase is a moment, not a night: the Moon is “full” at one instant, and looks full for a day either side of it. The live calendar works these out for your own clock and, if you let it, your own horizon.
Every night in December 2025
| Date | Phase | Lit |
|---|---|---|
| Mon 1 | Waxing Gibbous | 78% |
| Tue 2 | Waxing Gibbous | 87% |
| Wed 3 | Waxing Gibbous | 94% |
| Thu 4 | Waxing Gibbous Full Moon 23:15 UTC | 98% |
| Fri 5 | Full Moon | 100% |
| Sat 6 | Waning Gibbous | 98% |
| Sun 7 | Waning Gibbous | 94% |
| Mon 8 | Waning Gibbous | 87% |
| Tue 9 | Waning Gibbous | 79% |
| Wed 10 | Waning Gibbous | 69% |
| Thu 11 | Last Quarter Last Quarter 20:53 UTC | 59% |
| Fri 12 | Last Quarter | 49% |
| Sat 13 | Waning Crescent | 39% |
| Sun 14 | Waning Crescent | 30% |
| Mon 15 | Waning Crescent | 22% |
| Tue 16 | Waning Crescent | 14% |
| Wed 17 | Waning Crescent | 8% |
| Thu 18 | Waning Crescent | 4% |
| Fri 19 | New Moon | 1% |
| Sat 20 | New Moon New Moon 01:44 UTC | 0% |
| Sun 21 | New Moon | 1% |
| Mon 22 | Waxing Crescent | 4% |
| Tue 23 | Waxing Crescent | 8% |
| Wed 24 | Waxing Crescent | 14% |
| Thu 25 | Waxing Crescent | 22% |
| Fri 26 | Waxing Crescent | 31% |
| Sat 27 | First Quarter First Quarter 19:11 UTC | 41% |
| Sun 28 | First Quarter | 52% |
| Mon 29 | Waxing Gibbous | 63% |
| Tue 30 | Waxing Gibbous | 74% |
| Wed 31 | Waxing Gibbous | 84% |
Illumination is taken at 00:00 UTC on each date. It changes by a percent or two over a day, which is why the site’s own nightly card computes it for the evening you are actually standing in.
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2025
December in other years