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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
Today · 10:00–12:00 · 2h window
Medium confidence
66%
🌛Moon Altitude19°
☁️Total Cloud Coverage9.3%
starry-night weather icon
Good Dark Skies
Aspen
Today · 16:00–17:00
🌛Moon Altitude:69.9°
Medium
starry-night weather icon
Pristine Dark Skies (pristine)
Aspen
Tomorrow · 04:00–06:00
🌛Moon Altitude:-27.8--26.4°
Medium
starry-night weather icon
Pristine Dark Skies (pristine) at Sunrise
Aspen
Tomorrow · 06:00–08:00
🌛Moon Altitude:-26.4--22.3°
Medium
starry-night weather icon
Pristine Dark Skies (pristine)
Aspen
Tomorrow · 08:00–11:00
🌛Moon Altitude:-15.9-1.5°
Medium
starry-night weather icon
Pristine Dark Skies (pristine)
Aspen
Tue, Feb 24 · 05:00–06:00
🌛Moon Altitude:-22.9°
Medium
starry-night weather icon
Pristine Dark Skies (pristine) at Sunrise
Aspen
Tue, Feb 24 · 07:00–08:00
🌛Moon Altitude:-22.9°
Medium
+3 more windows in the next 10 days

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72-hour requirements breakdown

What passed or failed, hour by hour
29matching 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°
Sat, Feb 21
12:000%24135m0%18%37°
13:002.2%24134m0%18%47°
14:002.6%24135m0%18%57°
15:003.4%24135m0%18%64°
16:004.1%24135m0%18%66°
17:004.5%24135m0%28%61°
18:005.2%24135m0%28%53°
19:005.2%24134m0%28%43°
20:005.2%24135m0%28%32°
21:005%24134m0%28%21°
22:005%24135m0%28%9.8°
23:005%24134m0%28%-0.76°
Sun, Feb 22
24:005%24134m0%28%-11°
01:005%24134m0%28%-19°
02:005%24135m0%28%-26°
03:005%24135m0%28%-31°
04:005%24135m0%28%-33°
05:005%24134m0%28%-31°
06:005%24135m0%28%-27°
07:0021%24135m0%28%-21°
08:00100%24135m0%28%-12°
09:0028%24135m0%28%-2.5°
10:0014%24135m0%28%
11:009.3%24135m0%28%19°
12:0086%24134m0%28%30°
13:00100%24134m0%28%42°
14:00100%24135m0%28%53°
15:0028%24135m0%28%63°
16:0011%24135m0%28%70°
17:0079%24135m0%38%71°
18:0095%24135m0%38%65°
19:00100%24135m0%38%55°
20:00100%24135m0%38%45°
21:00100%24134m0%38%34°
22:00100%24135m0%38%23°
23:00100%24134m0%38%12°
Mon, Feb 23
24:0098%24135m0%38%1.7°
01:0093%24134m0%38%-7.6°
02:0071%24135m0%38%-16°
03:0056%24134m0%38%-22°
04:0013%24134m0%38%-26°
05:005%24135m0%38%-28°
06:005%24134m0%38%-26°
07:005%24135m0%38%-22°
08:005%24135m0%38%-16°
09:005%24134m0%38%-7.8°
10:005%24134m0%38%1.5°
11:007.8%24134m0%38%12°
12:0085%24135m0%38%22°
13:005.2%24135m0%38%33°
14:005%24135m0%38%45°
15:004.7%24135m0%38%56°
16:0068%24134m0%38%66°
17:00100%24135m0%50%74°
18:00100%24134m0%50%75°
19:006.4%24135m0%50%68°
20:00100%24135m0%50%57°
21:0075%24135m0%50%46°
22:0080%24135m0%50%35°
23:0061%24135m0%50%24°
Tue, Feb 24
24:0036%24134m0%50%14°
01:00100%24134m0%50%
02:00100%24135m0%50%-5°
03:0099%24135m0%50%-13°
04:0024%24134m0%50%-19°
05:005%24135m0%50%-23°
06:0035%24134m0%50%-24°
07:005%24135m0%50%-23°
08:0030%24135m0%50%-19°
09:0057%24134m0%50%-13°
10:0023%24135m0%50%-5.3°
11:0026%24135m0%50%3.7°
12:0022%24134m0%50%14°
13:0042%24134m0%50%24°
14:0051%24134m0%50%35°
15:0071%24134m7.4%50%46°
16:0082%24134m15%50%57°
17:0069%24135m22%61%68°
18:0078%16222m28%61%77°
19:0087%8309m33%61%77°
20:0096%396m39%61%69°
21:0097%311m43%61%59°
22:0099%227m48%61%48°
23:00100%142m52%61%37°
Wed, Feb 25
24:00100%134m58%61%26°
01:00100%126m63%61%15°
02:00100%118m69%61%5.6°
03:00100%123m74%61%-3.3°
04:00100%128m80%61%-11°
05:00100%134m85%61%-17°
06:00100%136m89%61%-21°
07:00100%138m93%61%-23°
08:00100%140m97%61%-21°
09:00100%184m98%61%-18°
10:00100%229m99%61%-12°
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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