Rule
Dark Skies
Aspen - Dark Skies - Rocky Mountains
Aspen, 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)
Aspen
Sat, Feb 21 · 20:00–21:00 · 1h window
Medium confidence
42%
🌛Moon Altitude31.8°
☁️Total Cloud Coverage8.4%
Good Dark Skies
Aspen
Sun, Feb 22 · 01:00–02:00
🌛Moon Altitude:-19.2°
Low
Good Dark Skies
Aspen
Sun, Feb 22 · 03:00–04:00
🌛Moon Altitude:-30.9°
Low
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72-hour requirements breakdown
What passed or failed, hour by hourOR 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% | -7.2° |
| 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% | 32° |
| 14:00 | ✓ | 100% | 21741m | 17% | 1.2% | 27° |
| 15:00 | ✓ | 100% | 12672m | 11% | 1.2% | 20° |
| 16:00 | ✓ | 100% | 19980m | 5.6% | 1.2% | 11° |
| 17:00 | ✓ | 90% | 20097m | 0% | 0% | 1.4° |
| 18:00 | ✓ | 13% | 9041m | 1.1% | 0% | -9.3° |
| 19:00 | ✓ | 2.6% | 19976m | 2.3% | 0% | -20° |
| 20:00 | ✓ | 0.5% | 24135m | 3.4% | 0% | -31° |
| 21:00 | ✓ | 5.7% | 24134m | 36% | 0% | -42° |
| 22:00 | ✓ | 2.9% | 24134m | 68% | 0% | -52° |
| 23:00 | ✓ | 2.1% | 24134m | 100% | 0% | -60° |
| Tue, Feb 17 | ||||||
| 24:00 | ✓ | 2.4% | 24134m | 100% | 0% | -65° |
| 01:00 | ✓ | 28% | 24134m | 100% | 0% | -63° |
| 02:00 | ✓ | 79% | 24134m | 100% | 0% | -56° |
| 03:00 | ✓ | 100% | 12893m | 100% | 0% | -46° |
| 04:00 | ✓ | 100% | 1382m | 100% | 0% | -35° |
| 05:00 | ✓ | 100% | 2886m | 100% | 0% | -24° |
| 06:00 | ✓ | 100% | 509m | 100% | 0% | -13° |
| 07:00 | ✓ | 90% | 242m | 99% | 0% | -1.3° |
| 08:00 | ✓ | 100% | 1773m | 99% | 0% | 9.4° |
| 09:00 | ✓ | 100% | 16192m | 99% | 0% | 19° |
| 10:00 | ✓ | 26% | 16687m | 99% | 0% | 28° |
| 11:00 | ✓ | 79% | 3142m | 100% | 0% | 35° |
| 12:00 | ✓ | 61% | 2372m | 100% | 0% | 39° |
| 13:00 | ✓ | 97% | 1260m | 100% | 0% | 40° |
| 14:00 | ✓ | 77% | 1904m | 100% | 0% | 37° |
| 15:00 | ✓ | 90% | 3501m | 100% | 0% | 31° |
| 16:00 | ✓ | 68% | 6429m | 100% | 0% | 23° |
| 17:00 | ✓ | 91% | 8040m | 100% | 1.2% | 13° |
| 18:00 | ✓ | 100% | 4064m | 100% | 1.2% | 2.8° |
| 19:00 | ✓ | 77% | 1440m | 100% | 1.2% | -8.1° |
| 20:00 | ✓ | 84% | 3031m | 100% | 1.2% | -19° |
| 21:00 | ✓ | 92% | 885m | 100% | 1.2% | -30° |
| 22:00 | ✓ | 90% | 911m | 100% | 1.2% | -41° |
| 23:00 | ✓ | 100% | 688m | 100% | 1.2% | -50° |
| Wed, Feb 18 | ||||||
| 24:00 | ✓ | 100% | 766m | 100% | 1.2% | -56° |
| 01:00 | ✓ | 94% | 1096m | 100% | 1.2% | -59° |
| 02:00 | ✓ | 100% | 12850m | 100% | 1.2% | -56° |
| 03:00 | ✓ | 100% | 875m | 100% | 1.2% | -49° |
| 04:00 | ✓ | 100% | 288m | 100% | 1.2% | -39° |
| 05:00 | ✓ | 100% | 930m | 100% | 1.2% | -29° |
| 06:00 | ✓ | 100% | 1464m | 100% | 1.2% | -17° |
| 07:00 | ✓ | 100% | 1731m | 100% | 1.2% | -6° |
| 08:00 | ✓ | 100% | 3895m | 100% | 1.2% | 5.3° |
| 09:00 | ✓ | 87% | 6698m | 100% | 1.2% | 16° |
| 10:00 | ✓ | 74% | 4960m | 100% | 1.2% | 26° |
| 11:00 | ✓ | 100% | 2416m | 100% | 1.2% | 35° |
| 12:00 | ✓ | 100% | 999m | 100% | 1.2% | 42° |
| 13:00 | ✓ | 100% | 1612m | 100% | 1.2% | 46° |
| 14:00 | ✓ | 100% | 1642m | 100% | 1.2% | 46° |
| 15:00 | ✓ | 100% | 1024m | 100% | 1.2% | 42° |
| 16:00 | ✓ | 100% | 1171m | 100% | 1.2% | 34° |
| 17:00 | ✓ | 100% | 8483m | 100% | 4.5% | 25° |
| 18:00 | ✓ | 100% | 875m | 98% | 4.5% | 15° |
| 19:00 | ✓ | 100% | 1244m | 95% | 4.5% | 4.4° |
| 20:00 | ✓ | 88% | 6537m | 93% | 4.5% | -6.7° |
| 21:00 | ✓ | 100% | 218m | 92% | 4.5% | -18° |
| 22:00 | ✓ | 100% | 170m | 91% | 4.5% | -28° |
| 23:00 | ✓ | 100% | 130m | 91% | 4.5% | -38° |
| Thu, Feb 19 | ||||||
| 24:00 | ✓ | 100% | 3984m | 73% | 4.5% | -46° |
| 01:00 | ✓ | 81% | 12032m | 56% | 4.5% | -51° |
| 02:00 | ✓ | 87% | 6075m | 39% | 4.5% | -52° |
| 03:00 | ✓ | 96% | 10855m | 41% | 4.5% | -48° |
| 04:00 | ✓ | 94% | 4135m | 44% | 4.5% | -41° |
| 05:00 | ✓ | 80% | 6026m | 46% | 4.5% | -32° |
| 06:00 | ✓ | 85% | 2922m | 52% | 4.5% | -22° |
| 07:00 | ✓ | 94% | 672m | 58% | 4.5% | -10° |
| 08:00 | ✓ | 93% | 863m | 64% | 4.5% | 0.97° |
| 09:00 | ✓ | 87% | 11015m | 68% | 4.5% | 12° |
| 10:00 | ✓ | 93% | 16224m | 72% | 4.5% | 23° |
| 11:00 | ✓ | 88% | 17788m | 76% | 4.5% | 34° |
| 12:00 | ✓ | 79% | 14523m | 58% | 4.5% | 43° |
| 13:00 | ✓ | 69% | 11258m | 40% | 4.5% | 50° |
| 14:00 | ✓ | 60% | 7993m | 22% | 4.5% | 53° |
| 15:00 | ✓ | 62% | 10352m | 28% | 4.5% | 51° |
| 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° |
| 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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