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
Pristine Dark Skies (pristine)
Aspen
Fri, Apr 17 · 21:23–04:49 · 7h window
Medium confidence
52%
🌛Moon Altitude-31.6--4.3°
☁️Total Cloud Coverage0-4.1%
Pristine Dark Skies (pristine)
Aspen
Sat, Apr 18 · 21:24–23:00
🌛Moon Altitude:-1-8.8°
Low
Pristine Dark Skies (pristine)
Aspen
Mon, Apr 20 · 21:27–22:00
🌛Moon Altitude:34.3°
Medium
Pristine Dark Skies (pristine)
Aspen
Tue, Apr 21 · 03:00–04:44
🌛Moon Altitude:-21.6--18.1°
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° |
|---|---|---|---|---|---|---|
| Tue, Apr 14 | ||||||
| 22:00 | ✓ | 100% | 509m | 72% | 5.3% | -49° |
| 23:00 | ✓ | 100% | 441m | 77% | 5.3% | -51° |
| Wed, Apr 15 | ||||||
| 24:00 | ✓ | 100% | 10969m | 82% | 5.3% | -50° |
| 01:00 | ✓ | 100% | 2786m | 37% | 5.3% | -44° |
| 02:00 | ✓ | 100% | 370m | 19% | 5.3% | -36° |
| 03:00 | ✓ | 100% | 211m | 0% | 5.3% | -26° |
| 04:00 | ✓ | 81% | 1622m | 13% | 5.3% | -15° |
| 05:00 | ✕ | 92% | 404m | 26% | 5.3% | -3.9° |
| 06:00 | ✕ | 89% | 538m | 39% | 5.3% | 7.5° |
| 07:00 | ✕ | 78% | 1548m | 26% | 5.3% | 19° |
| 08:00 | ✕ | 73% | 3756m | 54% | 5.3% | 30° |
| 09:00 | ✕ | 51% | 23162m | 40% | 5.3% | 39° |
| 10:00 | ✕ | 24% | 16760m | 40% | 5.3% | 47° |
| 11:00 | ✕ | 44% | 24135m | 39% | 5.3% | 53° |
| 12:00 | ✕ | 89% | 23863m | 39% | 5.3% | 53° |
| 13:00 | ✕ | 88% | 22529m | 26% | 5.3% | 49° |
| 14:00 | ✕ | 92% | 21363m | 13% | 5.3% | 42° |
| 15:00 | ✕ | 98% | 10306m | 0% | 5.3% | 33° |
| 16:00 | ✕ | 97% | 19899m | 0% | 5.3% | 23° |
| 17:00 | ✕ | 93% | 24134m | 0% | 5.3% | 12° |
| 18:00 | ✕ | 77% | 24134m | 0% | 1.4% | 0.57° |
| 19:00 | ✕ | 36% | 24134m | 0% | 1.4% | -10° |
| 20:00 | ✕ | 22% | 24134m | 0% | 1.4% | -21° |
| 21:00 | ✓ | 4.1% | 24135m | 0% | 1.4% | -30° |
| 22:00 | ✓ | 4.7% | 24135m | 0% | 1.4% | -38° |
| 23:00 | ✓ | 4.6% | 24135m | 0% | 1.4% | -43° |
| Thu, Apr 16 | ||||||
| 24:00 | ✓ | 3.3% | 24135m | 0% | 1.4% | -45° |
| 01:00 | ✓ | 2.6% | 24135m | 0% | 1.4% | -42° |
| 02:00 | ✓ | 2.6% | 24134m | 0% | 1.4% | -37° |
| 03:00 | ✓ | 3.9% | 24134m | 0% | 1.4% | -29° |
| 04:00 | ✓ | 3.5% | 24134m | 0% | 1.4% | -19° |
| 05:00 | ✕ | 0.9% | 24134m | 0% | 1.4% | -8.5° |
| 06:00 | ✕ | 0.9% | 24135m | 0% | 1.4% | 2.7° |
| 07:00 | ✕ | 0.5% | 24134m | 0% | 1.4% | 14° |
| 08:00 | ✕ | 0% | 24135m | 0% | 1.4% | 25° |
| 09:00 | ✕ | 0.9% | 24134m | 0% | 1.4% | 36° |
| 10:00 | ✕ | 2.9% | 24134m | 0% | 1.4% | 47° |
| 11:00 | ✕ | 5% | 24135m | 0% | 1.4% | 55° |
| 12:00 | ✕ | 5.2% | 24135m | 0% | 1.4% | 60° |
| 13:00 | ✕ | 76% | 24135m | 0% | 1.4% | 60° |
| 14:00 | ✕ | 66% | 24135m | 0% | 1.4% | 54° |
| 15:00 | ✕ | 72% | 24135m | 0% | 1.4% | 46° |
| 16:00 | ✕ | 82% | 24135m | 17% | 1.4% | 36° |
| 17:00 | ✕ | 97% | 24134m | 33% | 1.4% | 25° |
| 18:00 | ✕ | 100% | 24134m | 50% | 0% | 14° |
| 19:00 | ✕ | 100% | 24134m | 40% | 0% | 3° |
| 20:00 | ✕ | 84% | 19070m | 30% | 0% | -7.6° |
| 21:00 | ✓ | 99% | 11588m | 20% | 0% | -17° |
| 22:00 | ✓ | 80% | 9304m | 32% | 0% | -26° |
| 23:00 | ✓ | 51% | 24135m | 43% | 0% | -33° |
| Fri, Apr 17 | ||||||
| 24:00 | ✓ | 52% | 24134m | 54% | 0% | -37° |
| 01:00 | ✓ | 78% | 24134m | 69% | 0% | -38° |
| 02:00 | ✓ | 97% | 19172m | 84% | 0% | -35° |
| 03:00 | ✓ | 100% | 14627m | 99% | 0% | -30° |
| 04:00 | ✓ | 64% | 17001m | 100% | 0% | -22° |
| 05:00 | ✕ | 48% | 23583m | 100% | 0% | -13° |
| 06:00 | ✕ | 62% | 24135m | 100% | 0% | -2.5° |
| 07:00 | ✕ | 96% | 16696m | 93% | 0% | 8.5° |
| 08:00 | ✕ | 96% | 1883m | 86% | 0% | 20° |
| 09:00 | ✕ | 100% | 139m | 79% | 0% | 31° |
| 10:00 | ✕ | 100% | 160m | 77% | 0% | 42° |
| 11:00 | ✕ | 100% | 252m | 76% | 0% | 53° |
| 12:00 | ✕ | 100% | 556m | 74% | 0% | 61° |
| 13:00 | ✕ | 100% | 1962m | 53% | 0% | 67° |
| 14:00 | ✕ | 100% | 3711m | 33% | 0% | 65° |
| 15:00 | ✕ | 100% | 9174m | 12% | 0% | 59° |
| 16:00 | ✕ | 100% | 12251m | 8% | 0% | 49° |
| 17:00 | ✕ | 100% | 23858m | 4% | 0% | 39° |
| 18:00 | ✕ | 94% | 24135m | 0% | 1.4% | 28° |
| 19:00 | ✕ | 72% | 24134m | 0% | 1.4% | 17° |
| 20:00 | ✕ | 20% | 24134m | 0% | 1.4% | 5.8° |
| 21:00 | ✓ | 3.6% | 24134m | 0% | 1.4% | -4.3° |
| 22:00 | ✓ | 0.6% | 24135m | 0% | 1.4% | -14° |
| 23:00 | ✓ | 0.5% | 24135m | 0% | 1.4% | -22° |
| Sat, Apr 18 | ||||||
| 24:00 | ✓ | 4.1% | 24135m | 0% | 1.4% | -28° |
| 01:00 | ✓ | 2.7% | 24135m | 0% | 1.4% | -31° |
| 02:00 | ✓ | 1.4% | 24135m | 0% | 1.4% | -32° |
| 03:00 | ✓ | 0% | 24135m | 0% | 1.4% | -29° |
| 04:00 | ✓ | 0% | 24135m | 0% | 1.4% | -24° |
| 05:00 | ✕ | 0% | 24135m | 0% | 1.4% | -17° |
| 06:00 | ✕ | 0% | 24135m | 0% | 1.4% | -7.7° |
| 07:00 | ✕ | 1.7% | 24135m | 0% | 1.4% | 2.2° |
| 08:00 | ✕ | 3.3% | 24135m | 0% | 1.4% | 13° |
| 09:00 | ✕ | 5% | 24135m | 0% | 1.4% | 24° |
| 10:00 | ✕ | 5% | 24135m | 0% | 1.4% | 35° |
| 11:00 | ✕ | 5% | 24135m | 0% | 1.4% | 46° |
| 12:00 | ✕ | 5% | 24135m | 0% | 1.4% | 57° |
| 13:00 | ✕ | 5% | 24135m | 0% | 1.4% | 67° |
| 14:00 | ✕ | 5% | 24135m | 0% | 1.4% | 72° |
| 15:00 | ✕ | 5% | 24135m | 0% | 1.4% | 70° |
| 16:00 | ✕ | 5% | 24135m | 0% | 1.4% | 62° |
| 17:00 | ✕ | 5% | 24135m | 0% | 1.4% | 52° |
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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