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
Today · 10:00–12:00 · 2h window
Medium confidence
66%
🌛Moon Altitude19°
☁️Total Cloud Coverage9.3%
Good Dark Skies
Aspen
Today · 16:00–17:00
🌛Moon Altitude:69.9°
Medium
Pristine Dark Skies (pristine)
Aspen
Tomorrow · 04:00–06:00
🌛Moon Altitude:-27.8--26.4°
Medium
Pristine Dark Skies (pristine) at Sunrise
Aspen
Tomorrow · 06:00–08:00
🌛Moon Altitude:-26.4--22.3°
Medium
Pristine Dark Skies (pristine)
Aspen
Tomorrow · 08:00–11:00
🌛Moon Altitude:-15.9-1.5°
Medium
Pristine Dark Skies (pristine)
Aspen
Tue, Feb 24 · 05:00–06:00
🌛Moon Altitude:-22.9°
Medium
Pristine Dark Skies (pristine) at Sunrise
Aspen
Tue, Feb 24 · 07:00–08:00
🌛Moon Altitude:-22.9°
Medium
+3 more windows in the next 10 days
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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° |
|---|---|---|---|---|---|---|
| Sat, Feb 21 | ||||||
| 12:00 | ✓ | 0% | 24135m | 0% | 18% | 37° |
| 13:00 | ✓ | 2.2% | 24134m | 0% | 18% | 47° |
| 14:00 | ✓ | 2.6% | 24135m | 0% | 18% | 57° |
| 15:00 | ✓ | 3.4% | 24135m | 0% | 18% | 64° |
| 16:00 | ✓ | 4.1% | 24135m | 0% | 18% | 66° |
| 17:00 | ✓ | 4.5% | 24135m | 0% | 28% | 61° |
| 18:00 | ✓ | 5.2% | 24135m | 0% | 28% | 53° |
| 19:00 | ✓ | 5.2% | 24134m | 0% | 28% | 43° |
| 20:00 | ✓ | 5.2% | 24135m | 0% | 28% | 32° |
| 21:00 | ✓ | 5% | 24134m | 0% | 28% | 21° |
| 22:00 | ✓ | 5% | 24135m | 0% | 28% | 9.8° |
| 23:00 | ✓ | 5% | 24134m | 0% | 28% | -0.76° |
| Sun, Feb 22 | ||||||
| 24:00 | ✓ | 5% | 24134m | 0% | 28% | -11° |
| 01:00 | ✓ | 5% | 24134m | 0% | 28% | -19° |
| 02:00 | ✓ | 5% | 24135m | 0% | 28% | -26° |
| 03:00 | ✓ | 5% | 24135m | 0% | 28% | -31° |
| 04:00 | ✓ | 5% | 24135m | 0% | 28% | -33° |
| 05:00 | ✓ | 5% | 24134m | 0% | 28% | -31° |
| 06:00 | ✓ | 5% | 24135m | 0% | 28% | -27° |
| 07:00 | ✓ | 21% | 24135m | 0% | 28% | -21° |
| 08:00 | ✓ | 100% | 24135m | 0% | 28% | -12° |
| 09:00 | ✓ | 28% | 24135m | 0% | 28% | -2.5° |
| 10:00 | ✓ | 14% | 24135m | 0% | 28% | 8° |
| 11:00 | ✓ | 9.3% | 24135m | 0% | 28% | 19° |
| 12:00 | ✓ | 86% | 24134m | 0% | 28% | 30° |
| 13:00 | ✓ | 100% | 24134m | 0% | 28% | 42° |
| 14:00 | ✓ | 100% | 24135m | 0% | 28% | 53° |
| 15:00 | ✓ | 28% | 24135m | 0% | 28% | 63° |
| 16:00 | ✓ | 11% | 24135m | 0% | 28% | 70° |
| 17:00 | ✓ | 79% | 24135m | 0% | 38% | 71° |
| 18:00 | ✓ | 95% | 24135m | 0% | 38% | 65° |
| 19:00 | ✓ | 100% | 24135m | 0% | 38% | 55° |
| 20:00 | ✓ | 100% | 24135m | 0% | 38% | 45° |
| 21:00 | ✓ | 100% | 24134m | 0% | 38% | 34° |
| 22:00 | ✓ | 100% | 24135m | 0% | 38% | 23° |
| 23:00 | ✓ | 100% | 24134m | 0% | 38% | 12° |
| Mon, Feb 23 | ||||||
| 24:00 | ✓ | 98% | 24135m | 0% | 38% | 1.7° |
| 01:00 | ✓ | 93% | 24134m | 0% | 38% | -7.6° |
| 02:00 | ✓ | 71% | 24135m | 0% | 38% | -16° |
| 03:00 | ✓ | 56% | 24134m | 0% | 38% | -22° |
| 04:00 | ✓ | 13% | 24134m | 0% | 38% | -26° |
| 05:00 | ✓ | 5% | 24135m | 0% | 38% | -28° |
| 06:00 | ✓ | 5% | 24134m | 0% | 38% | -26° |
| 07:00 | ✓ | 5% | 24135m | 0% | 38% | -22° |
| 08:00 | ✓ | 5% | 24135m | 0% | 38% | -16° |
| 09:00 | ✓ | 5% | 24134m | 0% | 38% | -7.8° |
| 10:00 | ✓ | 5% | 24134m | 0% | 38% | 1.5° |
| 11:00 | ✓ | 7.8% | 24134m | 0% | 38% | 12° |
| 12:00 | ✓ | 85% | 24135m | 0% | 38% | 22° |
| 13:00 | ✓ | 5.2% | 24135m | 0% | 38% | 33° |
| 14:00 | ✓ | 5% | 24135m | 0% | 38% | 45° |
| 15:00 | ✓ | 4.7% | 24135m | 0% | 38% | 56° |
| 16:00 | ✓ | 68% | 24134m | 0% | 38% | 66° |
| 17:00 | ✓ | 100% | 24135m | 0% | 50% | 74° |
| 18:00 | ✓ | 100% | 24134m | 0% | 50% | 75° |
| 19:00 | ✓ | 6.4% | 24135m | 0% | 50% | 68° |
| 20:00 | ✓ | 100% | 24135m | 0% | 50% | 57° |
| 21:00 | ✓ | 75% | 24135m | 0% | 50% | 46° |
| 22:00 | ✓ | 80% | 24135m | 0% | 50% | 35° |
| 23:00 | ✓ | 61% | 24135m | 0% | 50% | 24° |
| Tue, Feb 24 | ||||||
| 24:00 | ✓ | 36% | 24134m | 0% | 50% | 14° |
| 01:00 | ✓ | 100% | 24134m | 0% | 50% | 4° |
| 02:00 | ✓ | 100% | 24135m | 0% | 50% | -5° |
| 03:00 | ✓ | 99% | 24135m | 0% | 50% | -13° |
| 04:00 | ✓ | 24% | 24134m | 0% | 50% | -19° |
| 05:00 | ✓ | 5% | 24135m | 0% | 50% | -23° |
| 06:00 | ✓ | 35% | 24134m | 0% | 50% | -24° |
| 07:00 | ✓ | 5% | 24135m | 0% | 50% | -23° |
| 08:00 | ✓ | 30% | 24135m | 0% | 50% | -19° |
| 09:00 | ✓ | 57% | 24134m | 0% | 50% | -13° |
| 10:00 | ✓ | 23% | 24135m | 0% | 50% | -5.3° |
| 11:00 | ✓ | 26% | 24135m | 0% | 50% | 3.7° |
| 12:00 | ✓ | 22% | 24134m | 0% | 50% | 14° |
| 13:00 | ✓ | 42% | 24134m | 0% | 50% | 24° |
| 14:00 | ✓ | 51% | 24134m | 0% | 50% | 35° |
| 15:00 | ✓ | 71% | 24134m | 7.4% | 50% | 46° |
| 16:00 | ✓ | 82% | 24134m | 15% | 50% | 57° |
| 17:00 | ✓ | 69% | 24135m | 22% | 61% | 68° |
| 18:00 | ✓ | 78% | 16222m | 28% | 61% | 77° |
| 19:00 | ✓ | 87% | 8309m | 33% | 61% | 77° |
| 20:00 | ✓ | 96% | 396m | 39% | 61% | 69° |
| 21:00 | ✓ | 97% | 311m | 43% | 61% | 59° |
| 22:00 | ✓ | 99% | 227m | 48% | 61% | 48° |
| 23:00 | ✓ | 100% | 142m | 52% | 61% | 37° |
| Wed, Feb 25 | ||||||
| 24:00 | ✓ | 100% | 134m | 58% | 61% | 26° |
| 01:00 | ✓ | 100% | 126m | 63% | 61% | 15° |
| 02:00 | ✓ | 100% | 118m | 69% | 61% | 5.6° |
| 03:00 | ✓ | 100% | 123m | 74% | 61% | -3.3° |
| 04:00 | ✓ | 100% | 128m | 80% | 61% | -11° |
| 05:00 | ✓ | 100% | 134m | 85% | 61% | -17° |
| 06:00 | ✓ | 100% | 136m | 89% | 61% | -21° |
| 07:00 | ✓ | 100% | 138m | 93% | 61% | -23° |
| 08:00 | ✓ | 100% | 140m | 97% | 61% | -21° |
| 09:00 | ✓ | 100% | 184m | 98% | 61% | -18° |
| 10:00 | ✓ | 100% | 229m | 99% | 61% | -12° |
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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