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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
Sat, Feb 21 · 20:00–21:00 · 1h window
Medium confidence
42%
🌛Moon Altitude31.8°
☁️Total Cloud Coverage8.4%
starry-night weather icon
Good Dark Skies
Aspen
Sun, Feb 22 · 01:00–02:00
🌛Moon Altitude:-19.2°
Low
starry-night weather icon
Good Dark Skies
Aspen
Sun, Feb 22 · 03:00–04:00
🌛Moon Altitude:-30.9°
Low

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72-hour requirements breakdown

What passed or failed, hour by hour
2matching hours in the next 95 hoursJump to next match
OR 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°
Mon, Feb 16
06:00100%24134m0%1.2%-7.2°
07:00100%24135m0%1.2%3.4°
08:00100%24135m0%1.2%13°
09:00100%24135m13%1.2%22°
10:00100%24134m26%1.2%29°
11:00100%24135m39%1.2%33°
12:00100%24135m32%1.2%34°
13:00100%24134m24%1.2%32°
14:00100%21741m17%1.2%27°
15:00100%12672m11%1.2%20°
16:00100%19980m5.6%1.2%11°
17:0090%20097m0%0%1.4°
18:0013%9041m1.1%0%-9.3°
19:002.6%19976m2.3%0%-20°
20:000.5%24135m3.4%0%-31°
21:005.7%24134m36%0%-42°
22:002.9%24134m68%0%-52°
23:002.1%24134m100%0%-60°
Tue, Feb 17
24:002.4%24134m100%0%-65°
01:0028%24134m100%0%-63°
02:0079%24134m100%0%-56°
03:00100%12893m100%0%-46°
04:00100%1382m100%0%-35°
05:00100%2886m100%0%-24°
06:00100%509m100%0%-13°
07:0090%242m99%0%-1.3°
08:00100%1773m99%0%9.4°
09:00100%16192m99%0%19°
10:0026%16687m99%0%28°
11:0079%3142m100%0%35°
12:0061%2372m100%0%39°
13:0097%1260m100%0%40°
14:0077%1904m100%0%37°
15:0090%3501m100%0%31°
16:0068%6429m100%0%23°
17:0091%8040m100%1.2%13°
18:00100%4064m100%1.2%2.8°
19:0077%1440m100%1.2%-8.1°
20:0084%3031m100%1.2%-19°
21:0092%885m100%1.2%-30°
22:0090%911m100%1.2%-41°
23:00100%688m100%1.2%-50°
Wed, Feb 18
24:00100%766m100%1.2%-56°
01:0094%1096m100%1.2%-59°
02:00100%12850m100%1.2%-56°
03:00100%875m100%1.2%-49°
04:00100%288m100%1.2%-39°
05:00100%930m100%1.2%-29°
06:00100%1464m100%1.2%-17°
07:00100%1731m100%1.2%-6°
08:00100%3895m100%1.2%5.3°
09:0087%6698m100%1.2%16°
10:0074%4960m100%1.2%26°
11:00100%2416m100%1.2%35°
12:00100%999m100%1.2%42°
13:00100%1612m100%1.2%46°
14:00100%1642m100%1.2%46°
15:00100%1024m100%1.2%42°
16:00100%1171m100%1.2%34°
17:00100%8483m100%4.5%25°
18:00100%875m98%4.5%15°
19:00100%1244m95%4.5%4.4°
20:0088%6537m93%4.5%-6.7°
21:00100%218m92%4.5%-18°
22:00100%170m91%4.5%-28°
23:00100%130m91%4.5%-38°
Thu, Feb 19
24:00100%3984m73%4.5%-46°
01:0081%12032m56%4.5%-51°
02:0087%6075m39%4.5%-52°
03:0096%10855m41%4.5%-48°
04:0094%4135m44%4.5%-41°
05:0080%6026m46%4.5%-32°
06:0085%2922m52%4.5%-22°
07:0094%672m58%4.5%-10°
08:0093%863m64%4.5%0.97°
09:0087%11015m68%4.5%12°
10:0093%16224m72%4.5%23°
11:0088%17788m76%4.5%34°
12:0079%14523m58%4.5%43°
13:0069%11258m40%4.5%50°
14:0060%7993m22%4.5%53°
15:0062%10352m28%4.5%51°
16:0064%12712m33%4.5%46°
17:0066%15072m39%10%38°
18:0077%10247m39%10%28°
19:0089%5421m39%10%17°
20:00100%596m39%10%
21:00100%507m44%10%-5°
22:00100%418m49%10%-16°
23:00100%328m54%10%-26°
Fri, Feb 20
24:00100%265m61%10%-35°
01:00100%202m68%10%-41°
02:00100%138m74%10%-45°
03:00100%141m79%10%-45°
04:00100%144m85%10%-41°
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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