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Rule Dark Skies

Matterhorn - Dark Skies - Alps

Zermatt, Valais, Switzerland

Moonless nights with crystal-clear skies for deep-sky photography

Upcoming Opportunities

When all conditions match, PhotoWeather marks an opportunity window.

Times shown in Europe/Zurich
Next opportunity
Excellent Dark Skies (pristine)
Matterhorn
Fri, Apr 24 · 03:00–04:31 · 2h window
Low confidence
34%
🌛Moon Altitude-4.7-3.8°
☁️Total Cloud Coverage9.9-19%
starry-night weather icon
Pristine Dark Skies (pristine)
Matterhorn
Sat, Apr 25 · 03:00–04:29
🌛Moon Altitude:-1.1-8.4°
Low

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72-hour requirements breakdown

What passed or failed, hour by hour
2matching hours in the next 86 hoursJump to next match
OR logic: one branch per group is enough
Meets requirement
Misses requirement
Time
Europe/Zurich
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 21
06:0030%24135m0%21%-14°
07:0078%24134m0%21%-11°
08:0064%24135m0%21%-5.5°
09:0093%24134m29%21%1.4°
10:0094%24135m59%21%9.5°
11:0095%24135m88%21%18°
12:0074%24134m91%21%28°
13:0053%24135m94%21%38°
14:0058%24135m98%21%48°
15:009.9%24134m67%21%57°
16:0063%9839m33%21%66°
17:0040%20107m0%21%72°
18:0057%9003m0%21%71°
19:0059%16246m0%21%65°
20:0064%1949m0%21%56°
21:0062%2563m4.9%21%46°
22:0060%1235m9.8%21%36°
23:0059%1253m15%21%26°
Wed, Apr 22
24:0025%21377m37%21%17°
01:0021%13842m60%21%8.1°
02:0022%15918m82%32%0.13°
03:0021%22200m68%32%-6.6°
04:0021%22362m53%32%-12°
05:0029%5562m39%32%-15°
06:0036%4415m53%32%-16°
07:0036%4494m68%32%-15°
08:0025%4571m82%32%-12°
09:0038%4316m73%32%-6.5°
10:0043%4435m65%32%0.31°
11:0043%4798m56%32%8.3°
12:0041%4430m59%32%17°
13:00100%4400m62%32%27°
14:0063%15455m65%32%36°
15:0049%9674m77%32%46°
16:0093%7803m88%32%56°
17:0094%8037m100%32%64°
18:0090%4684m72%32%70°
19:0085%659m43%32%70°
20:0085%444m15%32%64°
21:0089%1058m9.9%32%55°
22:0052%4540m5%32%46°
23:0046%8973m0%32%36°
Thu, Apr 23
24:0042%15272m0%32%26°
01:0033%6402m0%32%16°
02:0021%5019m0%43%6.9°
03:0021%5421m0%43%-1.3°
04:0020%7055m0%43%-8.3°
05:0019%7926m0%43%-14°
06:004.4%24135m0%43%-17°
07:004.3%24135m0%43%-19°
08:000.1%24135m0%43%-18°
09:000%24135m0%43%-14°
10:000%24134m0%43%-8.8°
11:000%24135m0%43%-1.9°
12:000%24135m0%43%6.2°
13:000%24135m0%43%15°
14:000%24134m0%43%25°
15:002%24135m0%43%35°
16:002.9%24135m0%43%44°
17:003%24134m0%43%54°
18:001.8%24135m0%43%62°
19:000%24134m0%43%67°
20:000%24134m0%43%67°
21:002.3%24134m0%43%61°
22:003.6%24134m0%43%53°
23:003.6%24134m0%43%43°
Fri, Apr 24
24:001.5%24135m0%43%33°
01:000.6%24135m0%43%23°
02:000.7%24135m0%54%13°
03:009.9%24135m0%54%3.8°
04:0019%24135m0%54%-4.7°
05:0028%24135m0%54%-12°
06:0033%24135m0%54%-18°
07:0037%24135m0%54%-21°
08:0042%24135m0%54%-23°
09:0048%24135m0%54%-21°
10:0053%24135m0%54%-18°
11:0059%24135m0%54%-12°
12:0049%24135m0%54%-4.7°
13:0040%24135m0%54%3.7°
14:0031%24135m0%54%13°
15:0023%24135m0%54%23°
16:0014%24135m0%54%33°
17:005%24135m0%54%42°
18:005%24135m0%54%51°
19:005%24135m0%54%59°
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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