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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
Tomorrow · 01:00–02:00 · 1h window
Medium confidence
65%
🌛Moon Altitude-13.3°
☁️Total Cloud Coverage7.9%
starry-night weather icon
Good Dark Skies
Crested Butte
Thu, Apr 16 · 21:21–22:00
🌛Moon Altitude:-17.4°
Medium
starry-night weather icon
Excellent Dark Skies (pristine)
Crested Butte
Fri, Apr 17 · 21:23–22:00
🌛Moon Altitude:-4.4°
Medium

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72-hour requirements breakdown

What passed or failed, hour by hour
5matching hours in the next 91 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 7
23:006.1%24134m0%66%-26°
Wed, Apr 8
24:006.6%24135m0%66%-15°
01:005%24135m0%66%-5.3°
02:003.7%24134m0%66%3.7°
03:005%24135m0%66%11°
04:004.4%24134m0%66%18°
05:000%24135m0%66%22°
06:004.7%24134m0%66%23°
07:003.8%24134m0%66%22°
08:004%24134m0%66%18°
09:000.3%24135m0%66%12°
10:001.9%24135m0%66%
11:005%24134m0%66%-4.9°
12:0010%24135m0%66%-15°
13:0040%24135m0%66%-25°
14:0041%24134m0%66%-36°
15:0093%24134m0%66%-48°
16:0097%24135m0%66%-59°
17:0035%24135m0%66%-69°
18:0026%24135m0%57%-78°
19:0094%24134m0%57%-77°
20:0077%24135m0%57%-68°
21:0096%24135m0%57%-57°
22:0053%24135m0%57%-46°
23:0048%24134m0%57%-35°
Thu, Apr 9
24:0041%24134m0%57%-24°
01:007.9%24134m0%57%-13°
02:0090%24135m0%57%-3.4°
03:0096%24134m0%57%5.6°
04:0049%24135m0%57%13°
05:0054%24135m0%57%19°
06:0059%24135m0%57%23°
07:0049%24135m0%57%24°
08:0027%24134m0%57%22°
09:0010%24135m0%57%18°
10:006%24134m0%57%12°
11:0090%24134m0%57%3.8°
12:00100%24135m0%57%-5.4°
13:00100%24135m7.4%57%-16°
14:00100%24134m15%57%-26°
15:00100%24134m22%57%-37°
16:00100%24135m22%57%-48°
17:00100%24134m22%57%-60°
18:0096%24135m22%47%-70°
19:0065%24134m15%47%-77°
20:0085%24134m7.4%47%-74°
21:0064%24135m0%47%-65°
22:00100%24134m0%47%-55°
23:00100%24134m0%47%-43°
Fri, Apr 10
24:00100%24135m0%47%-32°
01:00100%24134m0%47%-21°
02:00100%24134m0%47%-10°
03:0098%24135m0%47%-0.37°
04:0046%24135m0%47%8.7°
05:00100%24134m0%47%16°
06:00100%24134m0%47%22°
07:0011%24134m19%47%26°
08:0094%24134m37%47%26°
09:0090%24134m56%47%24°
10:00100%24134m57%47%20°
11:00100%24135m57%47%13°
12:00100%24135m58%47%4.3°
13:00100%24135m51%47%-5.3°
14:00100%24134m44%47%-16°
15:00100%9206m37%47%-26°
16:00100%24134m52%47%-38°
17:00100%24135m66%47%-49°
18:00100%24134m81%38%-60°
19:00100%23964m59%38%-69°
20:00100%24134m36%38%-74°
21:00100%24114m14%38%-71°
22:00100%24135m23%38%-62°
23:00100%24135m33%38%-51°
Sat, Apr 11
24:00100%19308m42%38%-40°
01:0085%15093m41%38%-28°
02:0070%10878m39%38%-17°
03:0055%6664m38%38%-6.3°
04:0070%4908m55%38%3.8°
05:0085%3152m72%38%13°
06:00100%1396m90%38%21°
07:0077%8073m93%38%26°
08:0053%14750m97%38%30°
09:0030%21427m100%38%30°
10:0048%22330m100%38%27°
11:0066%23233m100%38%22°
12:0084%24135m100%38%14°
13:0089%16136m88%38%5.3°
14:0095%8138m75%38%-4.7°
15:00100%139m63%38%-15°
16:0098%8138m67%38%-26°
17:0096%16136m71%38%-38°
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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