Boulder, CO sky calendar · December 2026
Full moon: Wed, Dec 23. New moon: Tue, Dec 8. Sunrise moves from 7:03 AM to 7:22 AM, sunset from 4:36 PM to 4:45 PM. 2 sky events this month (below). Times are local (MST).
| Date | Sunrise | Sunset | Moonrise | Moonset | Moon |
|---|---|---|---|---|---|
| Tue, Dec 1 | 7:03 AM | 4:36 PM | — | 12:36 PM | Waning crescent · 44% |
| Wed, Dec 2 | 7:04 AM | 4:35 PM | 12:47 AM | 12:59 PM | Waning crescent · 34% |
| Thu, Dec 3 | 7:05 AM | 4:35 PM | 1:52 AM | 1:22 PM | Waning crescent · 25% |
| Fri, Dec 4 | 7:06 AM | 4:35 PM | 2:57 AM | 1:46 PM | Waning crescent · 16% |
| Sat, Dec 5 | 7:07 AM | 4:35 PM | 4:02 AM | 2:12 PM | Waning crescent · 10% |
| Sun, Dec 6 | 7:08 AM | 4:35 PM | 5:06 AM | 2:43 PM | Waning crescent · 5% |
| Mon, Dec 7 | 7:09 AM | 4:35 PM | 6:10 AM | 3:20 PM | Waning crescent · 2% |
| Tue, Dec 8 | 7:10 AM | 4:35 PM | 7:10 AM | 4:04 PM | New moon · 0% |
| Wed, Dec 9 | 7:11 AM | 4:35 PM | 8:05 AM | 4:54 PM | Waxing crescent · 1% |
| Thu, Dec 10 | 7:12 AM | 4:35 PM | 8:53 AM | 5:50 PM | Waxing crescent · 3% |
| Fri, Dec 11 | 7:12 AM | 4:35 PM | 9:33 AM | 6:50 PM | Waxing crescent · 7% |
| Sat, Dec 12 | 7:13 AM | 4:35 PM | 10:07 AM | 7:52 PM | Waxing crescent · 12% |
| Sun, Dec 13 | 7:14 AM | 4:36 PM | 10:35 AM | 8:54 PM | Waxing crescent · 19% |
| Mon, Dec 14 | 7:15 AM | 4:36 PM | 11:00 AM | 9:56 PM | Waxing crescent · 27% |
| Tue, Dec 15 | 7:15 AM | 4:36 PM | 11:22 AM | 10:58 PM | Waxing crescent · 36% |
| Wed, Dec 16 | 7:16 AM | 4:36 PM | 11:44 AM | — | First quarter · 46% |
| Thu, Dec 17 | 7:17 AM | 4:37 PM | 12:06 PM | 12:00 AM | Waxing gibbous · 56% |
| Fri, Dec 18 | 7:17 AM | 4:37 PM | 12:29 PM | 1:05 AM | Waxing gibbous · 66% |
| Sat, Dec 19 | 7:18 AM | 4:38 PM | 12:56 PM | 2:14 AM | Waxing gibbous · 76% |
| Sun, Dec 20 | 7:18 AM | 4:38 PM | 1:29 PM | 3:27 AM | Waxing gibbous · 85% |
| Mon, Dec 21 | 7:19 AM | 4:38 PM | 2:11 PM | 4:44 AM | Waxing gibbous · 92% |
| Tue, Dec 22 | 7:19 AM | 4:39 PM | 3:05 PM | 6:01 AM | Waxing gibbous · 97% |
| Wed, Dec 23 | 7:20 AM | 4:40 PM | 4:12 PM | 7:13 AM | Full moon · 100% |
| Thu, Dec 24 | 7:20 AM | 4:40 PM | 5:29 PM | 8:14 AM | Waning gibbous · 99% |
| Fri, Dec 25 | 7:21 AM | 4:41 PM | 6:50 PM | 9:03 AM | Waning gibbous · 95% |
| Sat, Dec 26 | 7:21 AM | 4:41 PM | 8:09 PM | 9:41 AM | Waning gibbous · 89% |
| Sun, Dec 27 | 7:21 AM | 4:42 PM | 9:24 PM | 10:12 AM | Waning gibbous · 81% |
| Mon, Dec 28 | 7:22 AM | 4:43 PM | 10:35 PM | 10:39 AM | Waning gibbous · 71% |
| Tue, Dec 29 | 7:22 AM | 4:44 PM | 11:43 PM | 11:03 AM | Waning gibbous · 61% |
| Wed, Dec 30 | 7:22 AM | 4:44 PM | — | 11:26 AM | Last quarter · 50% |
| Thu, Dec 31 | 7:22 AM | 4:45 PM | 12:49 AM | 11:49 AM | Waning crescent · 40% |
Sky events this month
- Sun, Dec 13Geminids meteor shower peakUp to about 150 meteors an hour under a perfectly dark sky · the Moon stays out of the way
- Wed, Dec 23 6:28 PMFull moonSupermoon: a full moon close to Earth, slightly bigger and brighter
Month by month
Calculated with Astronomy Engine (MIT license).