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%
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 hourOR 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 | ||||||
| 06:00 | ✕ | 30% | 24135m | 0% | 21% | -14° |
| 07:00 | ✕ | 78% | 24134m | 0% | 21% | -11° |
| 08:00 | ✕ | 64% | 24135m | 0% | 21% | -5.5° |
| 09:00 | ✕ | 93% | 24134m | 29% | 21% | 1.4° |
| 10:00 | ✕ | 94% | 24135m | 59% | 21% | 9.5° |
| 11:00 | ✕ | 95% | 24135m | 88% | 21% | 18° |
| 12:00 | ✕ | 74% | 24134m | 91% | 21% | 28° |
| 13:00 | ✕ | 53% | 24135m | 94% | 21% | 38° |
| 14:00 | ✕ | 58% | 24135m | 98% | 21% | 48° |
| 15:00 | ✕ | 9.9% | 24134m | 67% | 21% | 57° |
| 16:00 | ✕ | 63% | 9839m | 33% | 21% | 66° |
| 17:00 | ✕ | 40% | 20107m | 0% | 21% | 72° |
| 18:00 | ✕ | 57% | 9003m | 0% | 21% | 71° |
| 19:00 | ✕ | 59% | 16246m | 0% | 21% | 65° |
| 20:00 | ✕ | 64% | 1949m | 0% | 21% | 56° |
| 21:00 | ✕ | 62% | 2563m | 4.9% | 21% | 46° |
| 22:00 | ✓ | 60% | 1235m | 9.8% | 21% | 36° |
| 23:00 | ✓ | 59% | 1253m | 15% | 21% | 26° |
| Wed, Apr 22 | ||||||
| 24:00 | ✓ | 25% | 21377m | 37% | 21% | 17° |
| 01:00 | ✓ | 21% | 13842m | 60% | 21% | 8.1° |
| 02:00 | ✓ | 22% | 15918m | 82% | 32% | 0.13° |
| 03:00 | ✓ | 21% | 22200m | 68% | 32% | -6.6° |
| 04:00 | ✓ | 21% | 22362m | 53% | 32% | -12° |
| 05:00 | ✕ | 29% | 5562m | 39% | 32% | -15° |
| 06:00 | ✕ | 36% | 4415m | 53% | 32% | -16° |
| 07:00 | ✕ | 36% | 4494m | 68% | 32% | -15° |
| 08:00 | ✕ | 25% | 4571m | 82% | 32% | -12° |
| 09:00 | ✕ | 38% | 4316m | 73% | 32% | -6.5° |
| 10:00 | ✕ | 43% | 4435m | 65% | 32% | 0.31° |
| 11:00 | ✕ | 43% | 4798m | 56% | 32% | 8.3° |
| 12:00 | ✕ | 41% | 4430m | 59% | 32% | 17° |
| 13:00 | ✕ | 100% | 4400m | 62% | 32% | 27° |
| 14:00 | ✕ | 63% | 15455m | 65% | 32% | 36° |
| 15:00 | ✕ | 49% | 9674m | 77% | 32% | 46° |
| 16:00 | ✕ | 93% | 7803m | 88% | 32% | 56° |
| 17:00 | ✕ | 94% | 8037m | 100% | 32% | 64° |
| 18:00 | ✕ | 90% | 4684m | 72% | 32% | 70° |
| 19:00 | ✕ | 85% | 659m | 43% | 32% | 70° |
| 20:00 | ✕ | 85% | 444m | 15% | 32% | 64° |
| 21:00 | ✕ | 89% | 1058m | 9.9% | 32% | 55° |
| 22:00 | ✓ | 52% | 4540m | 5% | 32% | 46° |
| 23:00 | ✓ | 46% | 8973m | 0% | 32% | 36° |
| Thu, Apr 23 | ||||||
| 24:00 | ✓ | 42% | 15272m | 0% | 32% | 26° |
| 01:00 | ✓ | 33% | 6402m | 0% | 32% | 16° |
| 02:00 | ✓ | 21% | 5019m | 0% | 43% | 6.9° |
| 03:00 | ✓ | 21% | 5421m | 0% | 43% | -1.3° |
| 04:00 | ✓ | 20% | 7055m | 0% | 43% | -8.3° |
| 05:00 | ✕ | 19% | 7926m | 0% | 43% | -14° |
| 06:00 | ✕ | 4.4% | 24135m | 0% | 43% | -17° |
| 07:00 | ✕ | 4.3% | 24135m | 0% | 43% | -19° |
| 08:00 | ✕ | 0.1% | 24135m | 0% | 43% | -18° |
| 09:00 | ✕ | 0% | 24135m | 0% | 43% | -14° |
| 10:00 | ✕ | 0% | 24134m | 0% | 43% | -8.8° |
| 11:00 | ✕ | 0% | 24135m | 0% | 43% | -1.9° |
| 12:00 | ✕ | 0% | 24135m | 0% | 43% | 6.2° |
| 13:00 | ✕ | 0% | 24135m | 0% | 43% | 15° |
| 14:00 | ✕ | 0% | 24134m | 0% | 43% | 25° |
| 15:00 | ✕ | 2% | 24135m | 0% | 43% | 35° |
| 16:00 | ✕ | 2.9% | 24135m | 0% | 43% | 44° |
| 17:00 | ✕ | 3% | 24134m | 0% | 43% | 54° |
| 18:00 | ✕ | 1.8% | 24135m | 0% | 43% | 62° |
| 19:00 | ✕ | 0% | 24134m | 0% | 43% | 67° |
| 20:00 | ✕ | 0% | 24134m | 0% | 43% | 67° |
| 21:00 | ✕ | 2.3% | 24134m | 0% | 43% | 61° |
| 22:00 | ✓ | 3.6% | 24134m | 0% | 43% | 53° |
| 23:00 | ✓ | 3.6% | 24134m | 0% | 43% | 43° |
| Fri, Apr 24 | ||||||
| 24:00 | ✓ | 1.5% | 24135m | 0% | 43% | 33° |
| 01:00 | ✓ | 0.6% | 24135m | 0% | 43% | 23° |
| 02:00 | ✓ | 0.7% | 24135m | 0% | 54% | 13° |
| 03:00 | ✓ | 9.9% | 24135m | 0% | 54% | 3.8° |
| 04:00 | ✓ | 19% | 24135m | 0% | 54% | -4.7° |
| 05:00 | ✕ | 28% | 24135m | 0% | 54% | -12° |
| 06:00 | ✕ | 33% | 24135m | 0% | 54% | -18° |
| 07:00 | ✕ | 37% | 24135m | 0% | 54% | -21° |
| 08:00 | ✕ | 42% | 24135m | 0% | 54% | -23° |
| 09:00 | ✕ | 48% | 24135m | 0% | 54% | -21° |
| 10:00 | ✕ | 53% | 24135m | 0% | 54% | -18° |
| 11:00 | ✕ | 59% | 24135m | 0% | 54% | -12° |
| 12:00 | ✕ | 49% | 24135m | 0% | 54% | -4.7° |
| 13:00 | ✕ | 40% | 24135m | 0% | 54% | 3.7° |
| 14:00 | ✕ | 31% | 24135m | 0% | 54% | 13° |
| 15:00 | ✕ | 23% | 24135m | 0% | 54% | 23° |
| 16:00 | ✕ | 14% | 24135m | 0% | 54% | 33° |
| 17:00 | ✕ | 5% | 24135m | 0% | 54% | 42° |
| 18:00 | ✕ | 5% | 24135m | 0% | 54% | 51° |
| 19:00 | ✕ | 5% | 24135m | 0% | 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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