Moon · December 2025

Moon calendar for Great Falls, Montana, United States: December 2025

Daily moon phases, illumination, moonrise and moonset in Great Falls, Montana, United States for December 2025. Full moon: December 4, 2025. All times are shown in the local time of Great Falls, Montana, United States.

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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%	1:52 PM	4:19 AM
2	Waxing Gibbous	94%	2:18 PM	5:42 AM
3	Waxing Gibbous	98%	2:34 PM	7:23 AM
4	Full Moon	100%	3:30 PM	8:33 AM
5	Waning Gibbous	99%	4:17 PM	9:55 AM
6	Waning Gibbous	95%	5:35 PM	10:53 AM
7	Waning Gibbous	89%	6:50 PM	11:41 AM
8	Waning Gibbous	81%	8:19 PM	12:11 PM
9	Waning Gibbous	72%	9:40 PM	12:25 PM
10	Waning Gibbous	62%	10:56 PM	12:40 PM
11	Last Quarter	52%	—	1:08 PM
12	Last Quarter	41%	12:15 AM	1:28 PM
13	Waning Crescent	32%	1:31 AM	1:35 PM
14	Waning Crescent	23%	2:25 AM	1:43 PM
15	Waning Crescent	16%	3:38 AM	2:08 PM
16	Waning Crescent	10%	4:33 AM	2:23 PM
17	Waning Crescent	5%	5:48 AM	2:52 PM
18	Waning Crescent	2%	6:49 AM	3:37 PM
19	New Moon	0%	7:51 AM	4:19 PM
20	New Moon	1%	8:33 AM	5:27 PM
21	Waxing Crescent	3%	9:32 AM	6:21 PM
22	Waxing Crescent	7%	9:57 AM	7:36 PM
23	Waxing Crescent	13%	10:23 AM	8:36 PM
24	Waxing Crescent	21%	10:35 AM	10:02 PM
25	Waxing Crescent	30%	11:15 AM	11:28 PM
26	First Quarter	41%	11:32 AM	—
27	First Quarter	52%	11:39 AM	12:26 AM
28	Waxing Gibbous	63%	11:57 AM	1:52 AM
29	Waxing Gibbous	74%	12:19 PM	3:30 AM
30	Waxing Gibbous	84%	12:33 PM	4:39 AM
31	Waxing Gibbous	91%	1:26 PM	6:17 AM

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Frequently asked questions

When is the full moon in December 2025 in Great Falls, 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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