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Rule Dark Skies

Crested Butte - Dark Skies - Rocky Mountains

Crested Butte, 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)
Crested Butte
Sat, Feb 21 · 20:00–21:00 · 1h window
Medium confidence
42%
🌛Moon Altitude31.9°
☁️Total Cloud Coverage8.4%
starry-night weather icon
Good Dark Skies
Crested Butte
Sun, Feb 22 · 01:00–02:00
🌛Moon Altitude:-19.3°
Low
starry-night weather icon
Good Dark Skies
Crested Butte
Sun, Feb 22 · 03:00–04:00
🌛Moon Altitude:-31.2°
Low

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72-hour requirements breakdown

What passed or failed, hour by hour
0matching hours in the next 95 hours
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%-7.3°
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%33°
14:00100%24135m17%1.2%28°
15:00100%7847m11%1.2%20°
16:00100%8139m5.6%1.2%12°
17:00100%24134m0%0%1.6°
18:00100%24134m1.1%0%-9.1°
19:0090%24134m2.3%0%-20°
20:0070%24135m3.4%0%-31°
21:007.8%24134m36%0%-42°
22:002.8%24134m68%0%-52°
23:002.7%24134m100%0%-61°
Tue, Feb 17
24:007.4%24134m100%0%-65°
01:0010%24134m100%0%-63°
02:0042%24134m100%0%-56°
03:0088%24135m100%0%-46°
04:0099%17668m100%0%-35°
05:00100%2338m100%0%-24°
06:00100%213m100%0%-13°
07:00100%496m99%0%-1.4°
08:00100%1727m99%0%9.5°
09:00100%3330m99%0%20°
10:0097%856m99%0%28°
11:00100%411m100%0%35°
12:00100%363m100%0%39°
13:00100%342m100%0%40°
14:0086%415m100%0%37°
15:00100%588m100%0%31°
16:0093%375m100%0%23°
17:0097%477m100%1.2%14°
18:00100%914m100%1.2%
19:00100%314m100%1.2%-7.9°
20:00100%217m100%1.2%-19°
21:00100%177m100%1.2%-30°
22:00100%199m100%1.2%-41°
23:00100%339m100%1.2%-50°
Wed, Feb 18
24:0094%579m100%1.2%-56°
01:00100%368m100%1.2%-59°
02:00100%318m100%1.2%-56°
03:00100%670m100%1.2%-49°
04:00100%542m100%1.2%-40°
05:00100%406m100%1.2%-29°
06:00100%342m100%1.2%-18°
07:00100%172m100%1.2%-6.1°
08:00100%708m100%1.2%5.3°
09:00100%1714m100%1.2%16°
10:00100%636m100%1.2%27°
11:00100%1139m100%1.2%36°
12:00100%1503m100%1.2%42°
13:00100%838m100%1.2%46°
14:00100%877m100%1.2%46°
15:00100%3945m100%1.2%42°
16:0097%1845m100%1.2%35°
17:00100%408m100%4.5%26°
18:00100%324m98%4.5%15°
19:00100%228m95%4.5%4.5°
20:0062%855m93%4.5%-6.6°
21:0075%336m92%4.5%-18°
22:0095%306m91%4.5%-28°
23:0062%796m91%4.5%-38°
Thu, Feb 19
24:0056%6453m73%4.5%-46°
01:0097%546m56%4.5%-51°
02:00100%327m39%4.5%-52°
03:00100%791m41%4.5%-49°
04:0091%767m44%4.5%-42°
05:0092%1145m46%4.5%-32°
06:0082%985m52%4.5%-22°
07:0064%1275m58%4.5%-11°
08:0065%2511m64%4.5%0.84°
09:0074%12865m68%4.5%12°
10:00100%19298m72%4.5%23°
11:0092%24029m76%4.5%34°
12:0081%18684m58%4.5%43°
13:0071%13338m40%4.5%50°
14:0060%7993m22%4.5%53°
15:0062%10352m28%4.5%52°
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%6.1°
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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