Rule
Dark Skies
Girdwood - Dark Skies - Alaska
Girdwood, Alaska, 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/Anchorage
Next opportunity
Pristine Dark Skies (pristine)
Girdwood
Sat, Mar 21 · 03:00–07:00 · 4h window
Low confidence
32%
🌛Moon Altitude-12.5--8.5°
☁️Total Cloud Coverage5-16%
Excellent Dark Skies (pristine) at Sunrise
Girdwood
Sat, Mar 21 · 07:00–09:00
🌛Moon Altitude:-4.3-1.1°
Low
Excellent Dark Skies (pristine)
Girdwood
Sat, Mar 21 · 09:00–13:00
🌛Moon Altitude:7.4-28.6°
Low
Pristine Dark Skies (pristine)
Girdwood
Sun, Mar 22 · 01:00–02:00
🌛Moon Altitude:3.7°
Medium
Pristine Dark Skies (pristine) at Sunrise
Girdwood
Sun, Mar 22 · 07:00–09:00
🌛Moon Altitude:-3.2-1°
Low
Pristine Dark Skies (pristine)
Girdwood
Sun, Mar 22 · 12:00–14:00
🌛Moon Altitude:26.2-33.3°
Low
Pristine Dark Skies (pristine)
Girdwood
Tue, Mar 24 · 10:00–11:00
🌛Moon Altitude:6.1°
Low
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72-hour requirements breakdown
What passed or failed, hour by hour0matching hours in the next 80 hours
OR logic: one branch per group is enough
Meets requirement
Misses requirement
Time America/Anchorage | 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, Mar 14 | ||||||
| 20:00 | ✕ | 100% | 1663m | 98% | 14% | -39° |
| 21:00 | ✕ | 100% | 688m | 99% | 14% | -44° |
| 22:00 | ✓ | 100% | 409m | 99% | 14% | -48° |
| 23:00 | ✓ | 100% | 187m | 95% | 14% | -50° |
| Sun, Mar 15 | ||||||
| 24:00 | ✓ | 100% | 220m | 95% | 14% | -49° |
| 01:00 | ✓ | 100% | 380m | 95% | 14% | -45° |
| 02:00 | ✓ | 100% | 497m | 96% | 14% | -40° |
| 03:00 | ✓ | 100% | 441m | 97% | 14% | -34° |
| 04:00 | ✓ | 100% | 267m | 98% | 14% | -27° |
| 05:00 | ✓ | 100% | 230m | 78% | 14% | -20° |
| 06:00 | ✓ | 100% | 219m | 59% | 14% | -13° |
| 07:00 | ✓ | 100% | 252m | 39% | 14% | -6.1° |
| 08:00 | ✓ | 100% | 222m | 45% | 14% | -0.24° |
| 09:00 | ✓ | 100% | 194m | 50% | 14% | 4.6° |
| 10:00 | ✓ | 100% | 319m | 56% | 14% | 8.2° |
| 11:00 | ✓ | 100% | 394m | 56% | 14% | 10° |
| 12:00 | ✓ | 100% | 592m | 56% | 14% | 11° |
| 13:00 | ✓ | 100% | 1049m | 56% | 14% | 9.2° |
| 14:00 | ✓ | 100% | 1115m | 65% | 14% | 6.3° |
| 15:00 | ✓ | 100% | 1013m | 73% | 14% | 2° |
| 16:00 | ✓ | 100% | 1116m | 82% | 7.9% | -3.5° |
| 17:00 | ✓ | 100% | 1087m | 59% | 7.9% | -9.7° |
| 18:00 | ✓ | 96% | 1000m | 36% | 7.9% | -16° |
| 19:00 | ✓ | 72% | 1182m | 13% | 7.9% | -23° |
| 20:00 | ✓ | 78% | 1415m | 8.7% | 7.9% | -30° |
| 21:00 | ✓ | 79% | 1126m | 4.3% | 7.9% | -36° |
| 22:00 | ✓ | 79% | 1007m | 0% | 7.9% | -41° |
| 23:00 | ✓ | 79% | 1118m | 0% | 7.9% | -44° |
| Mon, Mar 16 | ||||||
| 24:00 | ✓ | 77% | 1382m | 0% | 7.9% | -45° |
| 01:00 | ✓ | 77% | 1669m | 0% | 7.9% | -43° |
| 02:00 | ✓ | 78% | 1845m | 0% | 7.9% | -40° |
| 03:00 | ✓ | 79% | 1669m | 0% | 7.9% | -34° |
| 04:00 | ✓ | 79% | 1491m | 0% | 7.9% | -28° |
| 05:00 | ✓ | 79% | 1501m | 0% | 7.9% | -21° |
| 06:00 | ✓ | 79% | 1479m | 0% | 7.9% | -14° |
| 07:00 | ✓ | 80% | 1354m | 0% | 7.9% | -6.7° |
| 08:00 | ✓ | 99% | 1585m | 0% | 7.9% | -0.06° |
| 09:00 | ✓ | 100% | 2082m | 0% | 7.9% | 5.8° |
| 10:00 | ✓ | 100% | 2787m | 0% | 7.9% | 11° |
| 11:00 | ✓ | 100% | 3689m | 0% | 7.9% | 14° |
| 12:00 | ✓ | 99% | 3827m | 0% | 7.9% | 16° |
| 13:00 | ✓ | 100% | 3218m | 0% | 7.9% | 16° |
| 14:00 | ✓ | 100% | 2488m | 0% | 7.9% | 14° |
| 15:00 | ✓ | 100% | 2371m | 0% | 7.9% | 11° |
| 16:00 | ✓ | 98% | 2418m | 0% | 2.9% | 6° |
| 17:00 | ✓ | 99% | 2426m | 0% | 2.9% | 0.29° |
| 18:00 | ✓ | 97% | 2148m | 0% | 2.9% | -6.1° |
| 19:00 | ✓ | 94% | 1290m | 0% | 2.9% | -13° |
| 20:00 | ✓ | 99% | 1151m | 0% | 2.9% | -20° |
| 21:00 | ✓ | 100% | 1345m | 0% | 2.9% | -26° |
| 22:00 | ✓ | 100% | 1458m | 0% | 2.9% | -32° |
| 23:00 | ✓ | 100% | 1338m | 2.3% | 2.9% | -36° |
| Tue, Mar 17 | ||||||
| 24:00 | ✓ | 100% | 1823m | 4.7% | 2.9% | -38° |
| 01:00 | ✓ | 100% | 1940m | 7% | 2.9% | -39° |
| 02:00 | ✓ | 100% | 2427m | 18% | 2.9% | -37° |
| 03:00 | ✓ | 100% | 2416m | 28% | 2.9% | -33° |
| 04:00 | ✓ | 100% | 2870m | 39% | 2.9% | -28° |
| 05:00 | ✓ | 100% | 3152m | 26% | 2.9% | -21° |
| 06:00 | ✓ | 100% | 3744m | 13% | 2.9% | -14° |
| 07:00 | ✓ | 98% | 7099m | 0% | 2.9% | -6.9° |
| 08:00 | ✓ | 83% | 9644m | 13% | 2.9% | 0.21° |
| 09:00 | ✓ | 74% | 10312m | 26% | 2.9% | 6.9° |
| 10:00 | ✓ | 69% | 11520m | 39% | 2.9% | 13° |
| 11:00 | ✓ | 70% | 14603m | 35% | 2.9% | 18° |
| 12:00 | ✓ | 71% | 17686m | 31% | 2.9% | 21° |
| 13:00 | ✓ | 72% | 20768m | 27% | 2.9% | 22° |
| 14:00 | ✓ | 81% | 19767m | 26% | 2.9% | 22° |
| 15:00 | ✓ | 89% | 18766m | 24% | 2.9% | 20° |
| 16:00 | ✓ | 98% | 17765m | 22% | 0.4% | 16° |
| 17:00 | ✓ | 87% | 13771m | 15% | 0.4% | 11° |
| 18:00 | ✓ | 76% | 9778m | 7.4% | 0.4% | 4.5° |
| 19:00 | ✓ | 65% | 5785m | 0% | 0.4% | -2.1° |
| 20:00 | ✓ | 64% | 11902m | 0% | 0.4% | -8.9° |
| 21:00 | ✓ | 64% | 18018m | 0% | 0.4% | -16° |
| 22:00 | ✓ | 64% | 24135m | 0% | 0.4% | -22° |
| 23:00 | ✓ | 72% | 24135m | 0% | 0.4% | -27° |
| Wed, Mar 18 | ||||||
| 24:00 | ✓ | 80% | 24135m | 0% | 0.4% | -30° |
| 01:00 | ✓ | 88% | 24135m | 0% | 0.4% | -32° |
| 02:00 | ✓ | 92% | 24135m | 0% | 0.4% | -32° |
| 03:00 | ✓ | 96% | 24135m | 0% | 0.4% | -30° |
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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