Rule
Dark Skies
Crested Butte - Dark Skies - Rocky Mountains
Crested Butte, Colorado, United States
Moonless nights with crystal-clear skies for deep-sky photography
Upcoming Opportunities
When all conditions match, PhotoWeather marks an opportunity window.
Times shown in America/Denver
Next opportunity
Excellent Dark Skies (pristine)
Crested Butte
Sat, Feb 21 · 20:00–21:00 · 1h window
Medium confidence
42%
🌛Moon Altitude31.9°
☁️Total Cloud Coverage8.4%
Good Dark Skies
Crested Butte
Sun, Feb 22 · 01:00–02:00
🌛Moon Altitude:-19.3°
Low
Good Dark Skies
Crested Butte
Sun, Feb 22 · 03:00–04:00
🌛Moon Altitude:-31.2°
Low
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72-hour requirements breakdown
What passed or failed, hour by hour0matching hours in the next 95 hours
OR logic: one branch per group is enough
Meets requirement
Misses requirement
Time America/Denver | Astronomical Night Any | Total Cloud Coverage ≤ 20.0% | Visibility ≥ 12000.0m | Precipitation Chance ≤ 10.0% | Moon Illumination OR1·B1≤ 35.0% | Moon Altitude OR1·B2≤ 10.0° |
|---|---|---|---|---|---|---|
| Mon, Feb 16 | ||||||
| 06:00 | ✓ | 100% | 24134m | 0% | 1.2% | -7.3° |
| 07:00 | ✓ | 100% | 24135m | 0% | 1.2% | 3.4° |
| 08:00 | ✓ | 100% | 24135m | 0% | 1.2% | 13° |
| 09:00 | ✓ | 100% | 24135m | 13% | 1.2% | 22° |
| 10:00 | ✓ | 100% | 24134m | 26% | 1.2% | 29° |
| 11:00 | ✓ | 100% | 24135m | 39% | 1.2% | 33° |
| 12:00 | ✓ | 100% | 24135m | 32% | 1.2% | 34° |
| 13:00 | ✓ | 100% | 24134m | 24% | 1.2% | 33° |
| 14:00 | ✓ | 100% | 24135m | 17% | 1.2% | 28° |
| 15:00 | ✓ | 100% | 7847m | 11% | 1.2% | 20° |
| 16:00 | ✓ | 100% | 8139m | 5.6% | 1.2% | 12° |
| 17:00 | ✓ | 100% | 24134m | 0% | 0% | 1.6° |
| 18:00 | ✓ | 100% | 24134m | 1.1% | 0% | -9.1° |
| 19:00 | ✓ | 90% | 24134m | 2.3% | 0% | -20° |
| 20:00 | ✓ | 70% | 24135m | 3.4% | 0% | -31° |
| 21:00 | ✓ | 7.8% | 24134m | 36% | 0% | -42° |
| 22:00 | ✓ | 2.8% | 24134m | 68% | 0% | -52° |
| 23:00 | ✓ | 2.7% | 24134m | 100% | 0% | -61° |
| Tue, Feb 17 | ||||||
| 24:00 | ✓ | 7.4% | 24134m | 100% | 0% | -65° |
| 01:00 | ✓ | 10% | 24134m | 100% | 0% | -63° |
| 02:00 | ✓ | 42% | 24134m | 100% | 0% | -56° |
| 03:00 | ✓ | 88% | 24135m | 100% | 0% | -46° |
| 04:00 | ✓ | 99% | 17668m | 100% | 0% | -35° |
| 05:00 | ✓ | 100% | 2338m | 100% | 0% | -24° |
| 06:00 | ✓ | 100% | 213m | 100% | 0% | -13° |
| 07:00 | ✓ | 100% | 496m | 99% | 0% | -1.4° |
| 08:00 | ✓ | 100% | 1727m | 99% | 0% | 9.5° |
| 09:00 | ✓ | 100% | 3330m | 99% | 0% | 20° |
| 10:00 | ✓ | 97% | 856m | 99% | 0% | 28° |
| 11:00 | ✓ | 100% | 411m | 100% | 0% | 35° |
| 12:00 | ✓ | 100% | 363m | 100% | 0% | 39° |
| 13:00 | ✓ | 100% | 342m | 100% | 0% | 40° |
| 14:00 | ✓ | 86% | 415m | 100% | 0% | 37° |
| 15:00 | ✓ | 100% | 588m | 100% | 0% | 31° |
| 16:00 | ✓ | 93% | 375m | 100% | 0% | 23° |
| 17:00 | ✓ | 97% | 477m | 100% | 1.2% | 14° |
| 18:00 | ✓ | 100% | 914m | 100% | 1.2% | 3° |
| 19:00 | ✓ | 100% | 314m | 100% | 1.2% | -7.9° |
| 20:00 | ✓ | 100% | 217m | 100% | 1.2% | -19° |
| 21:00 | ✓ | 100% | 177m | 100% | 1.2% | -30° |
| 22:00 | ✓ | 100% | 199m | 100% | 1.2% | -41° |
| 23:00 | ✓ | 100% | 339m | 100% | 1.2% | -50° |
| Wed, Feb 18 | ||||||
| 24:00 | ✓ | 94% | 579m | 100% | 1.2% | -56° |
| 01:00 | ✓ | 100% | 368m | 100% | 1.2% | -59° |
| 02:00 | ✓ | 100% | 318m | 100% | 1.2% | -56° |
| 03:00 | ✓ | 100% | 670m | 100% | 1.2% | -49° |
| 04:00 | ✓ | 100% | 542m | 100% | 1.2% | -40° |
| 05:00 | ✓ | 100% | 406m | 100% | 1.2% | -29° |
| 06:00 | ✓ | 100% | 342m | 100% | 1.2% | -18° |
| 07:00 | ✓ | 100% | 172m | 100% | 1.2% | -6.1° |
| 08:00 | ✓ | 100% | 708m | 100% | 1.2% | 5.3° |
| 09:00 | ✓ | 100% | 1714m | 100% | 1.2% | 16° |
| 10:00 | ✓ | 100% | 636m | 100% | 1.2% | 27° |
| 11:00 | ✓ | 100% | 1139m | 100% | 1.2% | 36° |
| 12:00 | ✓ | 100% | 1503m | 100% | 1.2% | 42° |
| 13:00 | ✓ | 100% | 838m | 100% | 1.2% | 46° |
| 14:00 | ✓ | 100% | 877m | 100% | 1.2% | 46° |
| 15:00 | ✓ | 100% | 3945m | 100% | 1.2% | 42° |
| 16:00 | ✓ | 97% | 1845m | 100% | 1.2% | 35° |
| 17:00 | ✓ | 100% | 408m | 100% | 4.5% | 26° |
| 18:00 | ✓ | 100% | 324m | 98% | 4.5% | 15° |
| 19:00 | ✓ | 100% | 228m | 95% | 4.5% | 4.5° |
| 20:00 | ✓ | 62% | 855m | 93% | 4.5% | -6.6° |
| 21:00 | ✓ | 75% | 336m | 92% | 4.5% | -18° |
| 22:00 | ✓ | 95% | 306m | 91% | 4.5% | -28° |
| 23:00 | ✓ | 62% | 796m | 91% | 4.5% | -38° |
| Thu, Feb 19 | ||||||
| 24:00 | ✓ | 56% | 6453m | 73% | 4.5% | -46° |
| 01:00 | ✓ | 97% | 546m | 56% | 4.5% | -51° |
| 02:00 | ✓ | 100% | 327m | 39% | 4.5% | -52° |
| 03:00 | ✓ | 100% | 791m | 41% | 4.5% | -49° |
| 04:00 | ✓ | 91% | 767m | 44% | 4.5% | -42° |
| 05:00 | ✓ | 92% | 1145m | 46% | 4.5% | -32° |
| 06:00 | ✓ | 82% | 985m | 52% | 4.5% | -22° |
| 07:00 | ✓ | 64% | 1275m | 58% | 4.5% | -11° |
| 08:00 | ✓ | 65% | 2511m | 64% | 4.5% | 0.84° |
| 09:00 | ✓ | 74% | 12865m | 68% | 4.5% | 12° |
| 10:00 | ✓ | 100% | 19298m | 72% | 4.5% | 23° |
| 11:00 | ✓ | 92% | 24029m | 76% | 4.5% | 34° |
| 12:00 | ✓ | 81% | 18684m | 58% | 4.5% | 43° |
| 13:00 | ✓ | 71% | 13338m | 40% | 4.5% | 50° |
| 14:00 | ✓ | 60% | 7993m | 22% | 4.5% | 53° |
| 15:00 | ✓ | 62% | 10352m | 28% | 4.5% | 52° |
| 16:00 | ✓ | 64% | 12712m | 33% | 4.5% | 46° |
| 17:00 | ✓ | 66% | 15072m | 39% | 10% | 38° |
| 18:00 | ✓ | 77% | 10247m | 39% | 10% | 28° |
| 19:00 | ✓ | 89% | 5421m | 39% | 10% | 17° |
| 20:00 | ✓ | 100% | 596m | 39% | 10% | 6.1° |
| 21:00 | ✓ | 100% | 507m | 44% | 10% | -5° |
| 22:00 | ✓ | 100% | 418m | 49% | 10% | -16° |
| 23:00 | ✓ | 100% | 328m | 54% | 10% | -26° |
| Fri, Feb 20 | ||||||
| 24:00 | ✓ | 100% | 265m | 61% | 10% | -35° |
| 01:00 | ✓ | 100% | 202m | 68% | 10% | -41° |
| 02:00 | ✓ | 100% | 138m | 74% | 10% | -45° |
| 03:00 | ✓ | 100% | 141m | 79% | 10% | -45° |
| 04:00 | ✓ | 100% | 144m | 85% | 10% | -41° |
How to read: colored cells show whether each predicate requirement is met; highlighted rows mean the full rule matched (an opportunity). For OR groups, only one branch is required, so some OR-branch predicates can be ✕ even in a matching hour.
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