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Rule Dark Skies

Denali - Dark Skies - Alaska

Healy, 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
Excellent Dark Skies (pristine)
Denali
Fri, Feb 20 · 18:00–21:00 · 3h window
Low confidence
38%
🌛Moon Altitude22.2-31.8°
☁️Total Cloud Coverage5.1-5.3%
starry-night weather icon
Pristine Dark Skies (pristine)
Denali
Fri, Feb 20 · 21:00–07:00
🌛Moon Altitude:-13.4-16.3°
Low
starry-night weather icon
Pristine Dark Skies (pristine) at Sunrise
Denali
Sat, Feb 21 · 07:00–10:00
🌛Moon Altitude:-6.7-3.8°
Low

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72-hour requirements breakdown

What passed or failed, hour by hour
3matching hours in the next 95 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°
Mon, Feb 16
04:00100%1161m0%1.2%-32°
05:0096%1615m0%1.2%-26°
06:0098%2341m0%1.2%-19°
07:0076%5180m0%1.2%-13°
08:0072%7093m0%1.2%-6.3°
09:0065%9281m0%1.2%-0.78°
10:0058%10559m0%1.2%3.9°
11:0033%20842m0%1.2%7.4°
12:005%24135m0%1.2%9.5°
13:005%24134m0%1.2%10°
14:005%24134m0%1.2%9.1°
15:005%24134m0%0%6.7°
16:005%24134m0%0%2.9°
17:005%24134m0%0%-1.9°
18:005%24135m0%0%-7.5°
19:00100%24134m0%0%-14°
20:0081%24134m0%0%-20°
21:0099%24134m0%0%-26°
22:00100%24134m0%0%-31°
23:00100%24134m0%0%-35°
Tue, Feb 17
24:00100%24134m0%0%-38°
01:00100%24135m0%0%-39°
02:00100%24134m0%0%-38°
03:00100%24135m0%0%-35°
04:00100%24134m0%0%-31°
05:00100%24135m0%0%-25°
06:00100%24135m0%0%-19°
07:0098%24134m0%0%-13°
08:0098%24135m0%0%-6.1°
09:0096%24134m0%0%0.15°
10:00100%24134m0%0%5.7°
11:0097%24134m0%0%10°
12:00100%24134m0%0%14°
13:00100%24134m0%0%16°
14:0092%24134m0%0%16°
15:0079%24135m0%1.2%14°
16:0093%24134m13%1.2%12°
17:0092%24135m26%1.2%7.5°
18:00100%24135m39%1.2%2.3°
19:00100%24134m53%1.2%-3.5°
20:00100%24135m68%1.2%-9.6°
21:00100%24135m82%1.2%-16°
22:00100%24134m83%1.2%-21°
23:00100%17685m83%1.2%-26°
Wed, Feb 18
24:00100%15882m84%1.2%-30°
01:00100%24135m87%1.2%-33°
02:00100%24134m91%1.2%-33°
03:00100%24134m95%1.2%-32°
04:0098%24134m96%1.2%-29°
05:00100%24135m98%1.2%-24°
06:00100%24134m100%1.2%-18°
07:00100%6396m100%1.2%-12°
08:00100%396m100%1.2%-5.4°
09:00100%726m100%1.2%1.2°
10:00100%453m100%1.2%7.4°
11:00100%352m100%1.2%13°
12:00100%217m99%1.2%17°
13:00100%179m99%1.2%21°
14:00100%160m100%1.2%22°
15:00100%123m100%4.5%22°
16:00100%141m74%4.5%20°
17:00100%166m48%4.5%17°
18:00100%230m22%4.5%12°
19:00100%591m23%4.5%6.9°
20:0013%24135m25%4.5%0.93°
21:008.4%24134m26%4.5%-5.2°
22:004.9%24134m36%4.5%-11°
23:002.3%24135m46%4.5%-17°
Thu, Feb 19
24:0057%24135m56%4.5%-21°
01:0044%24135m65%4.5%-25°
02:0086%24135m74%4.5%-26°
03:00100%24135m83%4.5%-26°
04:00100%24134m87%4.5%-25°
05:0099%4630m91%4.5%-21°
06:00100%225m95%4.5%-16°
07:00100%160m94%4.5%-11°
08:00100%254m93%4.5%-4.4°
09:00100%270m93%4.5%2.2°
10:00100%295m80%4.5%8.8°
11:00100%320m68%4.5%15°
12:00100%345m56%4.5%20°
13:00100%331m65%4.5%25°
14:00100%317m73%4.5%28°
15:00100%304m82%10%29°
16:00100%387m82%10%28°
17:00100%471m82%10%26°
18:00100%555m82%10%22°
19:00100%714m82%10%17°
20:00100%873m82%10%12°
21:00100%1032m82%10%5.5°
22:00100%1059m66%10%-0.6°
23:00100%1086m49%10%-6.4°
Fri, Feb 20
24:00100%1113m33%10%-12°
01:00100%1447m35%10%-16°
02:00100%1782m37%10%-19°
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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