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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
Pristine Dark Skies (pristine)
Aspen
Fri, Apr 17 · 21:23–04:49 · 7h window
Medium confidence
52%
🌛Moon Altitude-31.6--4.3°
☁️Total Cloud Coverage0-4.1%
starry-night weather icon
Pristine Dark Skies (pristine)
Aspen
Sat, Apr 18 · 21:24–23:00
🌛Moon Altitude:-1-8.8°
Low
starry-night weather icon
Pristine Dark Skies (pristine)
Aspen
Mon, Apr 20 · 21:27–22:00
🌛Moon Altitude:34.3°
Medium
starry-night weather icon
Pristine Dark Skies (pristine)
Aspen
Tue, Apr 21 · 03:00–04:44
🌛Moon Altitude:-21.6--18.1°
Low

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72-hour requirements breakdown

What passed or failed, hour by hour
8matching hours in the next 92 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°
Tue, Apr 14
22:00100%509m72%5.3%-49°
23:00100%441m77%5.3%-51°
Wed, Apr 15
24:00100%10969m82%5.3%-50°
01:00100%2786m37%5.3%-44°
02:00100%370m19%5.3%-36°
03:00100%211m0%5.3%-26°
04:0081%1622m13%5.3%-15°
05:0092%404m26%5.3%-3.9°
06:0089%538m39%5.3%7.5°
07:0078%1548m26%5.3%19°
08:0073%3756m54%5.3%30°
09:0051%23162m40%5.3%39°
10:0024%16760m40%5.3%47°
11:0044%24135m39%5.3%53°
12:0089%23863m39%5.3%53°
13:0088%22529m26%5.3%49°
14:0092%21363m13%5.3%42°
15:0098%10306m0%5.3%33°
16:0097%19899m0%5.3%23°
17:0093%24134m0%5.3%12°
18:0077%24134m0%1.4%0.57°
19:0036%24134m0%1.4%-10°
20:0022%24134m0%1.4%-21°
21:004.1%24135m0%1.4%-30°
22:004.7%24135m0%1.4%-38°
23:004.6%24135m0%1.4%-43°
Thu, Apr 16
24:003.3%24135m0%1.4%-45°
01:002.6%24135m0%1.4%-42°
02:002.6%24134m0%1.4%-37°
03:003.9%24134m0%1.4%-29°
04:003.5%24134m0%1.4%-19°
05:000.9%24134m0%1.4%-8.5°
06:000.9%24135m0%1.4%2.7°
07:000.5%24134m0%1.4%14°
08:000%24135m0%1.4%25°
09:000.9%24134m0%1.4%36°
10:002.9%24134m0%1.4%47°
11:005%24135m0%1.4%55°
12:005.2%24135m0%1.4%60°
13:0076%24135m0%1.4%60°
14:0066%24135m0%1.4%54°
15:0072%24135m0%1.4%46°
16:0082%24135m17%1.4%36°
17:0097%24134m33%1.4%25°
18:00100%24134m50%0%14°
19:00100%24134m40%0%
20:0084%19070m30%0%-7.6°
21:0099%11588m20%0%-17°
22:0080%9304m32%0%-26°
23:0051%24135m43%0%-33°
Fri, Apr 17
24:0052%24134m54%0%-37°
01:0078%24134m69%0%-38°
02:0097%19172m84%0%-35°
03:00100%14627m99%0%-30°
04:0064%17001m100%0%-22°
05:0048%23583m100%0%-13°
06:0062%24135m100%0%-2.5°
07:0096%16696m93%0%8.5°
08:0096%1883m86%0%20°
09:00100%139m79%0%31°
10:00100%160m77%0%42°
11:00100%252m76%0%53°
12:00100%556m74%0%61°
13:00100%1962m53%0%67°
14:00100%3711m33%0%65°
15:00100%9174m12%0%59°
16:00100%12251m8%0%49°
17:00100%23858m4%0%39°
18:0094%24135m0%1.4%28°
19:0072%24134m0%1.4%17°
20:0020%24134m0%1.4%5.8°
21:003.6%24134m0%1.4%-4.3°
22:000.6%24135m0%1.4%-14°
23:000.5%24135m0%1.4%-22°
Sat, Apr 18
24:004.1%24135m0%1.4%-28°
01:002.7%24135m0%1.4%-31°
02:001.4%24135m0%1.4%-32°
03:000%24135m0%1.4%-29°
04:000%24135m0%1.4%-24°
05:000%24135m0%1.4%-17°
06:000%24135m0%1.4%-7.7°
07:001.7%24135m0%1.4%2.2°
08:003.3%24135m0%1.4%13°
09:005%24135m0%1.4%24°
10:005%24135m0%1.4%35°
11:005%24135m0%1.4%46°
12:005%24135m0%1.4%57°
13:005%24135m0%1.4%67°
14:005%24135m0%1.4%72°
15:005%24135m0%1.4%70°
16:005%24135m0%1.4%62°
17:005%24135m0%1.4%52°
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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