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Rule Dark Skies

Monument Valley - Dark Skies - US Southwest

Oljato-Monument Valley, Utah, United States

Moonless nights with crystal-clear skies for Milky Way shots

Upcoming Opportunities

When all conditions match, PhotoWeather marks an opportunity window.

Times shown in America/Denver
Next opportunity
Dark Skies
Monument Valley
Today · 11:00–16:00 · 5h window
Medium confidence
68%
Dark Skies
Monument Valley
Today · 16:00–17:00
High
Dark Skies
Monument Valley
Today · 17:00–03:00
Medium
Dark Skies
Monument Valley
Tomorrow · 13:00–14:00
High
Dark Skies
Monument Valley
Mon, Jan 12 · 06:00–07:00
Medium
Dark Skies
Monument Valley
Mon, Jan 12 · 07:00–09:00
Medium
Dark Skies
Monument Valley
Mon, Jan 12 · 09:00–16:00
Medium
+13 more windows in the next 14 days

What this forecast looks for

Plain-language explanation from the rule

This forecast tracks the conditions every astrophotographer needs: clear, moonless nights with exceptional atmospheric transparency. We combine cloud cover predictions with moon phase, lunar position, and visibility data to identify your best Milky Way shooting opportunities.

The American Southwest offers some of the darkest skies in the developed world. Many of these locations hold International Dark Sky Park designations, meaning active protection of their exceptional night sky quality.

What makes the Southwest special for astrophotography:

  • Exceptional darkness - Death Valley and Big Bend rank among the darkest places in North America
  • Dry climate - Low humidity means better atmospheric transparency and seeing conditions
  • Iconic foregrounds - Arches, hoodoos, mesas, and desert landscapes create unforgettable compositions
  • Altitude advantage - Many locations sit above 5,000 feet, reducing atmospheric interference

The Milky Way core is best visible from March through October in the Northern Hemisphere. For the most dramatic shots, plan around new moon phases and arrive well before astronomical twilight ends. Summer months offer the Milky Way core high overhead, while spring and fall provide lower-angle views perfect for wide landscape compositions.

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72-hour requirements breakdown

What passed or failed, hour by hour
44matching hours in the next 72 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, Jan 10
12:000%65900m0%51%-3.9°
13:000%69700m0%51%-16°
14:000%72900m0%51%-27°
15:000%73100m0%51%-39°
16:000%72600m0%51%-50°
17:000%70700m0%41%-59°
18:000%65500m0%41%-65°
19:000%62700m0%41%-65°
20:000%62400m0%41%-59°
21:000%61100m0%41%-49°
22:000%58100m0%41%-39°
23:000%55700m0%41%-27°
Sun, Jan 11
24:000%56800m0%41%-16°
01:000%57500m0%41%-4.4°
02:000%59200m0%41%6.4°
03:000%55500m0%41%16°
04:000%56300m0%41%25°
05:000%63000m0%41%32°
06:000%58200m0%41%36°
07:000%56800m0%41%37°
08:000%52400m0%41%35°
09:000%50800m0%41%29°
10:000%55300m0%41%21°
11:000%62600m0%41%11°
12:0025%68200m0%41%0.84°
13:009%72200m0%41%-10°
14:00100%77400m0%41%-22°
15:00100%79000m0%41%-34°
16:00100%79700m0%41%-45°
17:00100%79300m0%33%-56°
18:00100%78300m0%33%-66°
19:00100%76300m0%33%-71°
20:00100%75600m0%33%-68°
21:00100%75300m0%33%-60°
22:00100%75700m0%33%-49°
23:00100%75500m0%33%-38°
Mon, Jan 12
24:00100%73900m0%33%-27°
01:00100%71600m0%33%-15°
02:00100%70900m0%33%-4.3°
03:0098%58835m0%33%6.1°
04:00100%46670m0%33%15°
05:0036%34905m0%33%23°
06:006%24140m0%33%29°
07:000%24140m0%33%32°
08:000%24140m0%33%32°
09:000%24140m0%33%29°
10:000%24140m0%33%23°
11:000%24140m0%33%15°
12:000%24140m0%33%5.6°
13:000%24140m0%33%-4.8°
14:000%24140m0%33%-16°
15:000%24140m0%33%-27°
16:000%24140m0%33%-39°
17:000%24140m0%24%-51°
18:000%24140m0%24%-62°
19:000%24140m0%24%-71°
20:000%24140m0%24%-75°
21:000%24140m0%24%-70°
22:000%24140m0%24%-60°
23:000%24140m0%24%-49°
Tue, Jan 13
24:000%24140m0%24%-37°
01:000%24140m0%24%-26°
02:006%24140m0%24%-15°
03:006%24140m0%24%-4.2°
04:0011%24140m0%24%5.7°
05:0074%24140m0%24%14°
06:00100%24140m0%24%22°
07:000%24140m0%24%27°
08:000%24140m0%24%29°
09:000%24140m0%24%28°
10:000%24140m0%24%24°
11:000%24140m0%24%18°
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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