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
Tomorrow · 02:00–03:53 · 2h window
Medium confidence
43%
🌛Moon Altitude-3.9-7.5°
☁️Total Cloud Coverage5-18.2%
Pristine Dark Skies (pristine)
Aspen
Wed, May 27 · 03:00–03:51
🌛Moon Altitude:4.3°
Medium
Pristine Dark Skies (pristine)
Aspen
Thu, May 28 · 03:00–03:50
🌛Moon Altitude:8.2°
Medium
Pristine Dark Skies (pristine)
Aspen
Sun, May 31 · 22:23–23:00
🌛Moon Altitude:5.5°
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° |
|---|---|---|---|---|---|---|
| Sat, May 23 | ||||||
| 23:00 | ✓ | 5% | 24135m | 0% | 61% | 37° |
| Sun, May 24 | ||||||
| 24:00 | ✕ | 11% | 24134m | 0% | 61% | 26° |
| 01:00 | ✓ | 25% | 24134m | 0% | 61% | 15° |
| 02:00 | ✓ | 4.1% | 24134m | 0% | 61% | 3.2° |
| 03:00 | ✓ | 4.2% | 24134m | 0% | 61% | -8° |
| 04:00 | ✕ | 0% | 24135m | 0% | 61% | -19° |
| 05:00 | ✕ | 0% | 24134m | 0% | 61% | -29° |
| 06:00 | ✕ | 5% | 24135m | 0% | 61% | -37° |
| 07:00 | ✕ | 5% | 24135m | 0% | 61% | -44° |
| 08:00 | ✕ | 5% | 24135m | 0% | 61% | -47° |
| 09:00 | ✕ | 99% | 24134m | 0% | 61% | -45° |
| 10:00 | ✕ | 100% | 24134m | 13% | 61% | -40° |
| 11:00 | ✕ | 100% | 24134m | 26% | 61% | -33° |
| 12:00 | ✕ | 100% | 24134m | 39% | 61% | -23° |
| 13:00 | ✕ | 100% | 24135m | 41% | 61% | -13° |
| 14:00 | ✕ | 90% | 24134m | 42% | 61% | -2° |
| 15:00 | ✕ | 23% | 24135m | 44% | 61% | 9.1° |
| 16:00 | ✕ | 21% | 24134m | 48% | 61% | 20° |
| 17:00 | ✕ | 66% | 24135m | 52% | 61% | 30° |
| 18:00 | ✕ | 16% | 24135m | 56% | 71% | 40° |
| 19:00 | ✕ | 20% | 24135m | 37% | 71% | 47° |
| 20:00 | ✕ | 10% | 24135m | 19% | 71% | 51° |
| 21:00 | ✕ | 6.4% | 24135m | 0% | 71% | 51° |
| 22:00 | ✓ | 5% | 24134m | 0% | 71% | 47° |
| 23:00 | ✓ | 7.1% | 24134m | 0% | 71% | 39° |
| Mon, May 25 | ||||||
| 24:00 | ✓ | 5% | 24134m | 0% | 71% | 29° |
| 01:00 | ✓ | 3.7% | 24135m | 0% | 71% | 19° |
| 02:00 | ✓ | 18% | 24134m | 0% | 71% | 7.5° |
| 03:00 | ✓ | 5% | 24135m | 0% | 71% | -3.9° |
| 04:00 | ✕ | 6.7% | 24135m | 0% | 71% | -15° |
| 05:00 | ✕ | 7.6% | 24134m | 0% | 71% | -26° |
| 06:00 | ✕ | 54% | 24135m | 0% | 71% | -36° |
| 07:00 | ✕ | 24% | 24134m | 20% | 71% | -45° |
| 08:00 | ✕ | 58% | 24134m | 39% | 71% | -51° |
| 09:00 | ✕ | 100% | 24134m | 59% | 71% | -53° |
| 10:00 | ✕ | 100% | 24134m | 72% | 71% | -50° |
| 11:00 | ✕ | 100% | 24135m | 85% | 71% | -44° |
| 12:00 | ✕ | 100% | 23311m | 98% | 71% | -35° |
| 13:00 | ✕ | 100% | 24135m | 92% | 71% | -25° |
| 14:00 | ✕ | 97% | 24134m | 85% | 71% | -14° |
| 15:00 | ✕ | 100% | 24135m | 79% | 71% | -2.6° |
| 16:00 | ✕ | 99% | 23430m | 79% | 71% | 8.4° |
| 17:00 | ✕ | 100% | 16952m | 79% | 71% | 19° |
| 18:00 | ✕ | 100% | 14268m | 79% | 80% | 29° |
| 19:00 | ✕ | 100% | 20466m | 58% | 80% | 37° |
| 20:00 | ✕ | 97% | 23482m | 38% | 80% | 43° |
| 21:00 | ✕ | 99% | 23719m | 17% | 80% | 46° |
| 22:00 | ✓ | 100% | 24134m | 19% | 80% | 44° |
| 23:00 | ✓ | 100% | 24134m | 21% | 80% | 39° |
| Tue, May 26 | ||||||
| 24:00 | ✓ | 100% | 24135m | 23% | 80% | 31° |
| 01:00 | ✓ | 89% | 24134m | 32% | 80% | 22° |
| 02:00 | ✓ | 100% | 24135m | 40% | 80% | 11° |
| 03:00 | ✓ | 99% | 24134m | 49% | 80% | 0.19° |
| 04:00 | ✕ | 100% | 24135m | 66% | 80% | -11° |
| 05:00 | ✕ | 95% | 24134m | 82% | 80% | -23° |
| 06:00 | ✕ | 100% | 24134m | 99% | 80% | -34° |
| 07:00 | ✕ | 100% | 13211m | 99% | 80% | -44° |
| 08:00 | ✕ | 100% | 761m | 99% | 80% | -52° |
| 09:00 | ✕ | 100% | 758m | 99% | 80% | -58° |
| 10:00 | ✕ | 100% | 22576m | 99% | 80% | -58° |
| 11:00 | ✕ | 100% | 14177m | 100% | 80% | -54° |
| 12:00 | ✕ | 100% | 1916m | 100% | 80% | -46° |
| 13:00 | ✕ | 79% | 9322m | 99% | 80% | -36° |
| 14:00 | ✕ | 58% | 16729m | 97% | 80% | -25° |
| 15:00 | ✕ | 37% | 24135m | 96% | 80% | -14° |
| 16:00 | ✕ | 41% | 24135m | 95% | 80% | -3° |
| 17:00 | ✕ | 46% | 24135m | 94% | 80% | 7.8° |
| 18:00 | ✕ | 51% | 24135m | 93% | 87% | 18° |
| 19:00 | ✕ | 47% | 24135m | 65% | 87% | 27° |
| 20:00 | ✕ | 44% | 24135m | 38% | 87% | 34° |
| 21:00 | ✕ | 40% | 24135m | 10% | 87% | 39° |
| 22:00 | ✓ | 28% | 24135m | 6.7% | 87% | 40° |
| 23:00 | ✓ | 15% | 24135m | 3.3% | 87% | 38° |
| Wed, May 27 | ||||||
| 24:00 | ✓ | 2.5% | 24135m | 0% | 87% | 32° |
| 01:00 | ✓ | 3.1% | 24135m | 1.2% | 87% | 24° |
| 02:00 | ✓ | 3.8% | 24135m | 2.3% | 87% | 15° |
| 03:00 | ✓ | 4.4% | 24135m | 3.5% | 87% | 4.3° |
| 04:00 | ✕ | 13% | 24135m | 19% | 87% | -6.8° |
| 05:00 | ✕ | 21% | 24135m | 34% | 87% | -18° |
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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