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
Good Dark Skies
Aspen
Thu, Apr 16 · 21:22–22:00 · 1h window
Medium confidence
44%
🌛Moon Altitude-17.4°
☁️Total Cloud Coverage18.3%
Excellent Dark Skies (pristine)
Aspen
Fri, Apr 17 · 21:23–22:00
🌛Moon Altitude:-4.3°
Medium
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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 7 | ||||||
| 22:00 | ✓ | 8.8% | 24134m | 0% | 66% | -37° |
| 23:00 | ✓ | 66% | 24134m | 0% | 66% | -26° |
| Wed, Apr 8 | ||||||
| 24:00 | ✓ | 65% | 24135m | 0% | 66% | -15° |
| 01:00 | ✓ | 57% | 24135m | 0% | 66% | -5.3° |
| 02:00 | ✓ | 39% | 24134m | 0% | 66% | 3.6° |
| 03:00 | ✓ | 53% | 24135m | 0% | 66% | 11° |
| 04:00 | ✓ | 11% | 24134m | 0% | 66% | 17° |
| 05:00 | ✓ | 4% | 24135m | 0% | 66% | 21° |
| 06:00 | ✕ | 1.9% | 24134m | 0% | 66% | 23° |
| 07:00 | ✕ | 5% | 24134m | 0% | 66% | 21° |
| 08:00 | ✕ | 4.7% | 24134m | 0% | 66% | 17° |
| 09:00 | ✕ | 3.3% | 24135m | 0% | 66% | 11° |
| 10:00 | ✕ | 1.8% | 24135m | 0% | 66% | 3.7° |
| 11:00 | ✕ | 12% | 24134m | 0% | 66% | -5.2° |
| 12:00 | ✕ | 26% | 24135m | 0% | 66% | -15° |
| 13:00 | ✕ | 78% | 24135m | 0% | 66% | -26° |
| 14:00 | ✕ | 100% | 24134m | 0% | 66% | -37° |
| 15:00 | ✕ | 100% | 24134m | 0% | 66% | -48° |
| 16:00 | ✕ | 100% | 24135m | 0% | 66% | -59° |
| 17:00 | ✕ | 98% | 24135m | 0% | 66% | -69° |
| 18:00 | ✕ | 85% | 24135m | 0% | 57% | -78° |
| 19:00 | ✕ | 66% | 24134m | 0% | 57% | -77° |
| 20:00 | ✕ | 33% | 24135m | 0% | 57% | -68° |
| 21:00 | ✓ | 22% | 24135m | 0% | 57% | -57° |
| 22:00 | ✓ | 24% | 24135m | 0% | 57% | -46° |
| 23:00 | ✓ | 63% | 24134m | 0% | 57% | -35° |
| Thu, Apr 9 | ||||||
| 24:00 | ✓ | 79% | 24134m | 0% | 57% | -24° |
| 01:00 | ✓ | 65% | 24134m | 0% | 57% | -13° |
| 02:00 | ✓ | 60% | 24135m | 0% | 57% | -3.4° |
| 03:00 | ✓ | 98% | 24134m | 0% | 57% | 5.5° |
| 04:00 | ✓ | 59% | 24135m | 0% | 57% | 13° |
| 05:00 | ✓ | 85% | 24135m | 0% | 57% | 19° |
| 06:00 | ✕ | 34% | 24135m | 0% | 57% | 23° |
| 07:00 | ✕ | 17% | 24135m | 0% | 57% | 24° |
| 08:00 | ✕ | 8.1% | 24134m | 0% | 57% | 22° |
| 09:00 | ✕ | 5% | 24135m | 0% | 57% | 18° |
| 10:00 | ✕ | 24% | 24134m | 0% | 57% | 11° |
| 11:00 | ✕ | 100% | 24134m | 0% | 57% | 3.5° |
| 12:00 | ✕ | 100% | 24135m | 0% | 57% | -5.7° |
| 13:00 | ✕ | 100% | 24135m | 7.4% | 57% | -16° |
| 14:00 | ✕ | 100% | 24134m | 15% | 57% | -26° |
| 15:00 | ✕ | 100% | 24081m | 22% | 57% | -37° |
| 16:00 | ✕ | 82% | 24135m | 22% | 57% | -49° |
| 17:00 | ✕ | 97% | 24134m | 22% | 57% | -60° |
| 18:00 | ✕ | 100% | 24135m | 22% | 47% | -70° |
| 19:00 | ✕ | 77% | 24134m | 15% | 47% | -76° |
| 20:00 | ✕ | 100% | 23332m | 7.4% | 47% | -74° |
| 21:00 | ✓ | 59% | 24135m | 0% | 47% | -65° |
| 22:00 | ✓ | 50% | 24134m | 0% | 47% | -54° |
| 23:00 | ✓ | 97% | 24134m | 0% | 47% | -43° |
| Fri, Apr 10 | ||||||
| 24:00 | ✓ | 100% | 24135m | 0% | 47% | -32° |
| 01:00 | ✓ | 100% | 24134m | 0% | 47% | -21° |
| 02:00 | ✓ | 96% | 24134m | 0% | 47% | -10° |
| 03:00 | ✓ | 61% | 24135m | 0% | 47% | -0.43° |
| 04:00 | ✓ | 58% | 24135m | 0% | 47% | 8.5° |
| 05:00 | ✓ | 56% | 24134m | 0% | 47% | 16° |
| 06:00 | ✕ | 100% | 24134m | 0% | 47% | 22° |
| 07:00 | ✕ | 100% | 24134m | 19% | 47% | 25° |
| 08:00 | ✕ | 94% | 24134m | 37% | 47% | 26° |
| 09:00 | ✕ | 100% | 24134m | 56% | 47% | 24° |
| 10:00 | ✕ | 100% | 24134m | 57% | 47% | 19° |
| 11:00 | ✕ | 100% | 24135m | 57% | 47% | 12° |
| 12:00 | ✕ | 100% | 24135m | 58% | 47% | 4° |
| 13:00 | ✕ | 100% | 24135m | 51% | 47% | -5.5° |
| 14:00 | ✕ | 100% | 24134m | 44% | 47% | -16° |
| 15:00 | ✕ | 100% | 24135m | 37% | 47% | -27° |
| 16:00 | ✕ | 100% | 24134m | 52% | 47% | -38° |
| 17:00 | ✕ | 100% | 20111m | 66% | 47% | -49° |
| 18:00 | ✕ | 100% | 24134m | 81% | 38% | -60° |
| 19:00 | ✕ | 100% | 24134m | 59% | 38% | -69° |
| 20:00 | ✕ | 100% | 24134m | 36% | 38% | -74° |
| 21:00 | ✓ | 100% | 24135m | 14% | 38% | -70° |
| 22:00 | ✓ | 100% | 22970m | 23% | 38% | -61° |
| 23:00 | ✓ | 100% | 24135m | 33% | 38% | -51° |
| Sat, Apr 11 | ||||||
| 24:00 | ✓ | 100% | 24135m | 42% | 38% | -39° |
| 01:00 | ✓ | 85% | 18311m | 41% | 38% | -28° |
| 02:00 | ✓ | 70% | 12487m | 39% | 38% | -17° |
| 03:00 | ✓ | 55% | 6664m | 38% | 38% | -6.3° |
| 04:00 | ✓ | 70% | 4908m | 55% | 38% | 3.8° |
| 05:00 | ✓ | 85% | 3152m | 72% | 38% | 13° |
| 06:00 | ✕ | 100% | 1396m | 90% | 38% | 21° |
| 07:00 | ✕ | 77% | 8073m | 93% | 38% | 26° |
| 08:00 | ✕ | 53% | 14750m | 97% | 38% | 29° |
| 09:00 | ✕ | 30% | 21427m | 100% | 38% | 30° |
| 10:00 | ✕ | 48% | 22330m | 100% | 38% | 27° |
| 11:00 | ✕ | 66% | 23233m | 100% | 38% | 21° |
| 12:00 | ✕ | 84% | 24135m | 100% | 38% | 14° |
| 13:00 | ✕ | 89% | 16136m | 88% | 38% | 5° |
| 14:00 | ✕ | 95% | 8138m | 75% | 38% | -4.9° |
| 15:00 | ✕ | 100% | 139m | 63% | 38% | -16° |
| 16:00 | ✕ | 98% | 8138m | 67% | 38% | -27° |
| 17:00 | ✕ | 96% | 16136m | 71% | 38% | -38° |
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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