What conditions does Dark Skies look for?

Astronomical Night: Any. Total Cloud Coverage: ≤ 20.0%. Visibility: ≥ 12000.0m. Precipitation Chance: ≤ 10.0%. Moon Illumination: ≤ 35.0%. Moon Altitude: ≤ 10.0°

How often do conditions match?

There are 10 upcoming opportunity windows in the next 10 days.

More Dark Skies in Rocky Mountains

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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

Pristine Dark Skies (pristine)

Crested Butte

Tomorrow · 03:00–03:55 · 1h window

Medium confidence

61%

🌛Moon Altitude20.6°

☁️Total Cloud Coverage5%

Pristine Dark Skies (pristine)

Crested Butte

Tomorrow · 22:30–03:56

🌛Moon Altitude:-27-13.2°

Medium

Pristine Dark Skies (pristine)

Crested Butte

Fri, Jul 10 · 22:29–03:57

🌛Moon Altitude:-25.2-4.9°

Medium

Pristine Dark Skies (pristine)

Crested Butte

Sat, Jul 11 · 22:29–03:58

🌛Moon Altitude:-23.3--4°

Medium

Pristine Dark Skies (pristine)

Crested Butte

Sun, Jul 12 · 22:28–03:59

🌛Moon Altitude:-23.5--12.9°

Medium

Pristine Dark Skies (pristine)

Crested Butte

Mon, Jul 13 · 22:27–04:00

🌛Moon Altitude:-25.9--12.8°

Medium

Good Dark Skies

Crested Butte

Tue, Jul 14 · 22:26–24:00

🌛Moon Altitude:-16--7.3°

Low

+3 more windows in the next 10 days

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72-hour requirements breakdown

What passed or failed, hour by hour

13matching 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°
Tue, Jul 7
07:00	✕	0.1%	24135m	17%	53%	59°
08:00	✕	1%	24135m	33%	53%	55°
09:00	✕	0.9%	24135m	50%	53%	48°
10:00	✕	5%	24135m	45%	53%	38°
11:00	✕	94%	24135m	40%	53%	27°
12:00	✕	100%	24135m	35%	53%	16°
13:00	✕	85%	24135m	40%	53%	5.1°
14:00	✕	100%	24134m	31%	53%	-5.7°
15:00	✕	100%	24135m	22%	53%	-16°
16:00	✕	100%	23807m	33%	53%	-25°
17:00	✕	100%	5814m	45%	53%	-33°
18:00	✕	99%	531m	56%	43%	-38°
19:00	✕	41%	24134m	41%	43%	-40°
20:00	✕	100%	24135m	21%	43%	-39°
21:00	✕	68%	14299m	0%	43%	-34°
22:00	✓	22%	24135m	17%	43%	-26°
23:00	✓	44%	24134m	33%	43%	-17°
Wed, Jul 8
24:00	✓	53%	24135m	50%	43%	-6.8°
01:00	✓	4.5%	24134m	0%	43%	4.1°
02:00	✓	6.5%	24135m	0%	43%	15°
03:00	✓	8.4%	24134m	0%	43%	27°
04:00	✕	47%	24134m	0%	43%	38°
05:00	✕	70%	24134m	0%	43%	49°
06:00	✕	5%	24134m	0%	43%	58°
07:00	✕	13%	24134m	0%	43%	64°
08:00	✕	0%	24135m	0%	43%	64°
09:00	✕	0%	24135m	0%	43%	59°
10:00	✕	1.8%	24135m	0%	43%	50°
11:00	✕	3.9%	24135m	0%	43%	40°
12:00	✕	20%	24134m	0%	43%	29°
13:00	✕	24%	24134m	0%	43%	18°
14:00	✕	6%	24134m	0%	43%	6.8°
15:00	✕	15%	24135m	0%	43%	-3.7°
16:00	✕	15%	24134m	7.4%	43%	-13°
17:00	✕	93%	24134m	15%	43%	-22°
18:00	✕	53%	24135m	22%	32%	-29°
19:00	✕	0.3%	24135m	28%	32%	-33°
20:00	✕	45%	24135m	33%	32%	-34°
21:00	✕	7.2%	24134m	39%	32%	-32°
22:00	✓	26%	24134m	34%	32%	-27°
23:00	✓	89%	24134m	30%	32%	-20°
Thu, Jul 9
24:00	✓	77%	24135m	26%	32%	-11°
01:00	✓	30%	24135m	17%	32%	-1.3°
02:00	✓	52%	24134m	8.7%	32%	9.5°
03:00	✓	5%	24135m	0%	32%	21°
04:00	✕	6.5%	24134m	0%	32%	32°
05:00	✕	19%	24135m	0%	32%	43°
06:00	✕	7.3%	24135m	0%	32%	54°
07:00	✕	2.3%	24134m	0%	32%	64°
08:00	✕	3.6%	24135m	0%	32%	70°
09:00	✕	1.4%	24135m	0%	32%	69°
10:00	✕	30%	24134m	0%	32%	62°
11:00	✕	68%	24135m	0%	32%	53°
12:00	✕	76%	24135m	0%	32%	42°
13:00	✕	56%	24134m	0%	32%	31°
14:00	✕	48%	24135m	0%	32%	20°
15:00	✕	90%	24135m	0%	32%	8.9°
16:00	✕	95%	24135m	0%	32%	-1.2°
17:00	✕	100%	24135m	0%	32%	-10°
18:00	✕	7.2%	24135m	0%	22%	-18°
19:00	✕	0%	24135m	0%	22%	-24°
20:00	✕	0%	24135m	0%	22%	-28°
21:00	✕	0%	24134m	0%	22%	-29°
22:00	✓	0%	24135m	0%	22%	-27°
23:00	✓	0%	24134m	0%	22%	-22°
Fri, Jul 10
24:00	✓	0%	24135m	0%	22%	-15°
01:00	✓	3.8%	24134m	0%	22%	-6.9°
02:00	✓	4.1%	24134m	0%	22%	2.8°
03:00	✓	15%	24135m	0%	22%	13°
04:00	✕	4.7%	24134m	0%	22%	24°
05:00	✕	1.6%	24134m	0%	22%	35°
06:00	✕	2%	24134m	0%	22%	47°
07:00	✕	0%	24135m	0%	22%	58°
08:00	✕	0%	24134m	0%	22%	68°
09:00	✕	1.4%	24134m	0%	22%	75°
10:00	✕	0.1%	24135m	0%	22%	73°
11:00	✕	99%	24135m	0%	22%	65°
12:00	✕	99%	24135m	0%	22%	55°
13:00	✕	71%	24135m	0%	22%	44°
14:00	✕	44%	24135m	0%	22%	33°
15:00	✕	17%	24135m	0%	22%	22°
16:00	✕	17%	24135m	0%	22%	11°
17:00	✕	17%	24135m	0%	22%	1.5°
18:00	✕	16%	24135m	0%	13%	-7.4°
19:00	✕	16%	24135m	0%	13%	-15°
20:00	✕	16%	24135m	0%	13%	-21°
21:00	✕	16%	24135m	0%	13%	-24°
22:00	✓	11%	24135m	0%	13%	-25°
23:00	✓	5.3%	24135m	0%	13%	-23°
Sat, Jul 11
24:00	✓	0%	24135m	0%	13%	-19°
01:00	✓	0%	24135m	0%	13%	-12°
02:00	✓	0%	24135m	0%	13%	-4.4°
03:00	✓	0%	24135m	0%	13%	4.9°
04:00	✕	33%	24135m	0%	13%	15°
05:00	✕	66%	24135m	0%	13%	26°

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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