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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
Good Dark Skies
Girdwood
Mon, Feb 9 · 15:00–17:00 · 2h window
Low confidence
39%
☁️Total Cloud Coverage14.2-16.6%
🌕Moon Illumination40.1%

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72-hour requirements breakdown

What passed or failed, hour by hour
2matching hours in the next 72 hoursJump to next match
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, Feb 7
21:0099%56m83%59%-35°
22:0099%55m82%59%-29°
23:0098%54m82%59%-22°
Sun, Feb 8
24:00100%54m82%59%-15°
01:00100%60m87%59%-8.5°
02:0099%67m93%59%-2.5°
03:0098%86m99%59%2.7°
04:00100%114m85%59%6.6°
05:00100%158m70%59%9.1°
06:0099%207m56%59%9.9°
07:00100%225m68%59%
08:00100%242m80%59%6.5°
09:00100%221m92%59%2.5°
10:00100%349m88%59%-2.7°
11:0099%460m85%59%-8.8°
12:0095%556m82%59%-16°
13:00100%599m86%59%-23°
14:0099%355m90%59%-30°
15:0099%171m95%50%-37°
16:00100%116m94%50%-43°
17:00100%93m94%50%-47°
18:00100%88m94%50%-50°
19:00100%77m95%50%-50°
20:00100%64m96%50%-48°
21:00100%65m97%50%-43°
22:00100%48m95%50%-37°
23:00100%80m92%50%-31°
Mon, Feb 9
24:00100%74m90%50%-24°
01:00100%137m89%50%-17°
02:00100%160m89%50%-11°
03:00100%93m88%50%-5°
04:00100%95m71%50%-0.21°
05:00100%121m54%50%3.3°
06:00100%150m37%50%5.4°
07:00100%177m37%50%5.8°
08:00100%184m37%50%4.6°
09:0096%461m37%50%1.9°
10:0094%1182m25%50%-2.3°
11:0081%4111m12%50%-7.5°
12:0026%22889m0%50%-14°
13:0056%15567m0%50%-20°
14:0056%11819m0%50%-28°
15:0017%21529m0%40%-35°
16:0014%21238m0%40%-41°
17:0044%17166m0%40%-47°
18:0063%10052m0%40%-52°
19:0070%3914m13%40%-54°
20:0074%3069m26%40%-53°
21:0058%12715m39%40%-50°
22:0089%22234m48%40%-45°
23:0099%22296m57%40%-39°
Tue, Feb 10
24:0087%9470m67%40%-32°
01:0077%24135m75%40%-25°
02:0051%24134m83%40%-19°
03:0052%10650m92%40%-12°
04:0068%7160m91%40%-6.8°
05:0084%3669m90%40%-2.4°
06:00100%179m90%40%0.83°
07:00100%176m93%40%2.6°
08:00100%172m96%40%2.7°
09:00100%169m100%40%1.3°
10:00100%171m100%40%-1.6°
11:00100%174m100%40%-5.8°
12:00100%176m100%40%-11°
13:00100%155m100%40%-17°
14:00100%133m100%40%-24°
15:00100%112m100%32%-31°
16:00100%108m100%32%-38°
17:00100%105m100%32%-45°
18:00100%101m100%32%-51°
19:00100%110m100%32%-55°
20:00100%120m100%32%-56°
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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