Moon · December 2025
Moon calendar for Helena, Montana, United States: December 2025
Daily moon phases, illumination, moonrise and moonset in Helena, Montana, United States for December 2025. Full moon: December 4, 2025. All times are shown in the local time of Helena, Montana, United States.
Full moonThursday, December 4, 2025, 4:18 PM
New moonFriday, December 19, 2025, 7:59 PM
| Day | Phase | Illumination | Moonrise | Moonset |
|---|---|---|---|---|
| 1 | Waxing Gibbous | 87% | 2:00 PM | 4:19 AM |
| 2 | Waxing Gibbous | 94% | 2:21 PM | 5:42 AM |
| 3 | Waxing Gibbous | 98% | 2:47 PM | 7:21 AM |
| 4 | Full Moon | 100% | 3:36 PM | 8:30 AM |
| 5 | Waning Gibbous | 99% | 4:23 PM | 9:51 AM |
| 6 | Waning Gibbous | 95% | 5:41 PM | 10:46 AM |
| 7 | Waning Gibbous | 89% | 7:08 PM | 11:39 AM |
| 8 | Waning Gibbous | 81% | 8:22 PM | 12:10 PM |
| 9 | Waning Gibbous | 72% | 9:44 PM | 12:25 PM |
| 10 | Waning Gibbous | 62% | 11:08 PM | 12:34 PM |
| 11 | Last Quarter | 52% | — | 1:12 PM |
| 12 | Last Quarter | 41% | 12:18 AM | 1:30 PM |
| 13 | Waning Crescent | 32% | 1:33 AM | 1:36 PM |
| 14 | Waning Crescent | 23% | 2:25 AM | 1:43 PM |
| 15 | Waning Crescent | 16% | 3:39 AM | 2:13 PM |
| 16 | Waning Crescent | 10% | 4:34 AM | 2:26 PM |
| 17 | Waning Crescent | 5% | 5:48 AM | 3:07 PM |
| 18 | Waning Crescent | 2% | 6:47 AM | 3:40 PM |
| 19 | New Moon | 0% | 7:49 AM | 4:23 PM |
| 20 | New Moon | 1% | 8:32 AM | 5:32 PM |
| 21 | Waxing Crescent | 3% | 9:32 AM | 6:24 PM |
| 22 | Waxing Crescent | 7% | 9:57 AM | 7:39 PM |
| 23 | Waxing Crescent | 13% | 10:23 AM | 8:40 PM |
| 24 | Waxing Crescent | 21% | 10:37 AM | 10:08 PM |
| 25 | Waxing Crescent | 30% | 11:14 AM | 11:31 PM |
| 26 | First Quarter | 41% | 11:34 AM | — |
| 27 | First Quarter | 52% | 11:42 AM | 12:28 AM |
| 28 | Waxing Gibbous | 63% | 12:06 PM | 1:54 AM |
| 29 | Waxing Gibbous | 74% | 12:22 PM | 3:30 AM |
| 30 | Waxing Gibbous | 84% | 12:43 PM | 4:35 AM |
| 31 | Waxing Gibbous | 91% | 1:32 PM | 6:15 AM |
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Frequently asked questions
When is the full moon in December 2025 in Helena, Montana, United States?
The full moon peaks on Thursday, December 4, 2025, 4:18 PM (local time).
When is the new moon in December 2025?
The new moon falls on Friday, December 19, 2025, 7:59 PM (local time) — the darkest nights of the month, best for stargazing.
Data: Meeus astronomical algorithms. How we calculate this
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