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 20 upcoming opportunity windows in the next 10 days.

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Rule Dark Skies

Valdez - Dark Skies - Alaska

Valdez, Alaska, 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/Anchorage

Next opportunity

Excellent Dark Skies (pristine)

Valdez

Today · 10:00–11:00 · 1h window

Medium confidence

67%

🌛Moon Altitude8.4°

☁️Total Cloud Coverage6.6%

Pristine Dark Skies (pristine)

Valdez

Today · 11:00–19:00

🌛Moon Altitude:2.4-18.4°

Medium

Pristine Dark Skies (pristine)

Valdez

Thu, Feb 19 · 18:00–20:00

🌛Moon Altitude:17.4-23.2°

Medium

Excellent Dark Skies (pristine)

Valdez

Thu, Feb 19 · 20:00–21:00

🌛Moon Altitude:11°

Medium

Good Dark Skies

Valdez

Thu, Feb 19 · 21:00–22:00

🌛Moon Altitude:4.3°

Medium

Good Dark Skies

Valdez

Fri, Feb 20 · 03:00–05:00

🌛Moon Altitude:-22.6--21.9°

Low

Excellent Dark Skies (pristine)

Valdez

Fri, Feb 20 · 05:00–06:00

🌛Moon Altitude:-19.3°

Medium

+13 more windows in the next 10 days

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72-hour requirements breakdown

What passed or failed, hour by hour

20matching hours in the next 95 hoursJump to next match

OR logic: one branch per group is enough

Meets requirement

Misses requirement

Time America/Anchorage	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
04:00	✓	22%	17595m	0%	1.2%	-32°
05:00	✓	25%	17456m	0%	1.2%	-25°
06:00	✓	24%	17499m	0%	1.2%	-18°
07:00	✓	21%	19681m	0%	1.2%	-11°
08:00	✓	18%	19856m	0%	1.2%	-4°
09:00	✓	9.8%	23480m	0%	1.2%	1.9°
10:00	✓	21%	19831m	0%	1.2%	6.8°
11:00	✓	15%	20960m	0%	1.2%	10°
12:00	✓	1.3%	24135m	0%	1.2%	12°
13:00	✓	1.3%	24134m	0%	1.2%	13°
14:00	✓	1.3%	24134m	0%	1.2%	11°
15:00	✕	3.5%	24134m	0%	0%	8.3°
16:00	✕	7.2%	23516m	0%	0%	3.9°
17:00	✕	18%	19385m	0%	0%	-1.6°
18:00	✕	22%	17867m	0%	0%	-7.8°
19:00	✕	85%	18835m	0%	0%	-15°
20:00	✓	56%	19768m	0%	0%	-21°
21:00	✓	11%	23160m	0%	0%	-28°
22:00	✓	85%	22816m	0%	0%	-34°
23:00	✓	96%	24134m	0%	0%	-38°
Tue, Feb 17
24:00	✓	100%	24134m	0%	0%	-41°
01:00	✓	100%	24135m	0%	0%	-42°
02:00	✓	100%	24134m	0%	0%	-41°
03:00	✓	100%	24135m	0%	0%	-37°
04:00	✓	100%	24134m	0%	0%	-32°
05:00	✓	100%	24135m	0%	0%	-25°
06:00	✓	100%	24135m	0%	0%	-18°
07:00	✓	100%	24134m	0%	0%	-11°
08:00	✓	100%	24135m	0%	0%	-4.2°
09:00	✓	87%	24134m	0%	0%	2.5°
10:00	✓	6.6%	24134m	0%	0%	8.4°
11:00	✓	5%	24134m	0%	0%	13°
12:00	✓	0.9%	24134m	0%	0%	17°
13:00	✓	0%	24134m	0%	0%	18°
14:00	✓	0%	24134m	0%	0%	18°
15:00	✓	0%	24135m	0%	1.2%	17°
16:00	✓	1.5%	24134m	0%	1.2%	13°
17:00	✓	4.5%	24135m	0%	1.2%	8.2°
18:00	✓	5%	24135m	0%	1.2%	2.4°
19:00	✓	63%	24134m	0%	1.2%	-4.1°
20:00	✓	30%	24135m	0%	1.2%	-11°
21:00	✓	30%	24135m	0%	1.2%	-18°
22:00	✓	100%	24134m	0%	1.2%	-24°
23:00	✓	100%	24134m	0%	1.2%	-29°
Wed, Feb 18
24:00	✓	100%	24135m	0%	1.2%	-33°
01:00	✓	100%	24135m	0%	1.2%	-36°
02:00	✓	100%	24134m	0%	1.2%	-36°
03:00	✓	100%	24134m	0%	1.2%	-34°
04:00	✓	63%	24134m	13%	1.2%	-30°
05:00	✓	28%	24135m	26%	1.2%	-25°
06:00	✓	0.5%	24134m	39%	1.2%	-18°
07:00	✓	4.8%	24135m	47%	1.2%	-11°
08:00	✓	26%	24134m	56%	1.2%	-4.1°
09:00	✓	24%	24134m	64%	1.2%	3.1°
10:00	✓	5%	24134m	70%	1.2%	9.8°
11:00	✓	94%	24134m	77%	1.2%	16°
12:00	✓	76%	24130m	84%	1.2%	20°
13:00	✓	60%	8983m	87%	1.2%	24°
14:00	✓	82%	2119m	90%	1.2%	25°
15:00	✓	100%	714m	93%	4.5%	24°
16:00	✓	100%	903m	74%	4.5%	22°
17:00	✓	100%	914m	56%	4.5%	18°
18:00	✓	86%	958m	37%	4.5%	13°
19:00	✓	62%	2081m	39%	4.5%	6.6°
20:00	✓	55%	21797m	41%	4.5%	0.002°
21:00	✓	74%	24134m	43%	4.5%	-6.8°
22:00	✓	75%	24134m	37%	4.5%	-13°
23:00	✓	53%	24135m	32%	4.5%	-19°
Thu, Feb 19
24:00	✓	64%	21341m	26%	4.5%	-24°
01:00	✓	90%	19721m	30%	4.5%	-28°
02:00	✓	83%	17466m	33%	4.5%	-29°
03:00	✓	72%	16553m	37%	4.5%	-29°
04:00	✓	59%	16267m	34%	4.5%	-27°
05:00	✓	63%	7962m	31%	4.5%	-23°
06:00	✓	89%	8039m	28%	4.5%	-17°
07:00	✓	100%	461m	29%	4.5%	-11°
08:00	✓	100%	346m	31%	4.5%	-3.7°
09:00	✓	100%	904m	32%	4.5%	3.5°
10:00	✓	86%	8648m	38%	4.5%	11°
11:00	✓	72%	16391m	44%	4.5%	17°
12:00	✓	59%	24135m	50%	4.5%	23°
13:00	✓	41%	24135m	67%	4.5%	28°
14:00	✓	23%	24135m	83%	4.5%	31°
15:00	✓	4.8%	24135m	100%	10%	32°
16:00	✓	3.5%	24135m	67%	10%	31°
17:00	✓	2.2%	24135m	33%	10%	28°
18:00	✓	0.9%	24135m	0%	10%	23°
19:00	✓	4%	24135m	0%	10%	17°
20:00	✓	7.1%	24135m	0%	10%	11°
21:00	✓	10%	24135m	0%	10%	4.3°
22:00	✓	36%	24135m	0%	10%	-2.4°
23:00	✓	62%	24135m	0%	10%	-8.7°
Fri, Feb 20
24:00	✓	88%	24135m	0%	10%	-14°
01:00	✓	64%	24135m	0%	10%	-19°
02:00	✓	41%	24135m	0%	10%	-22°

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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