Rule
Dark Skies
Zermatt - 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
Good Dark Skies
Zermatt
Tomorrow · 21:00–23:00 · 2h window
Medium confidence
46%
🌛Moon Altitude-54.7--49.2°
☁️Total Cloud Coverage12.8-14.1%
Good Dark Skies
Zermatt
Tue, Mar 17 · 01:00–02:00
🌛Moon Altitude:-47.8°
Medium
Pristine Dark Skies (pristine)
Zermatt
Tue, Mar 17 · 20:17–04:55
🌛Moon Altitude:-50--22.9°
Medium
Pristine Dark Skies (pristine)
Zermatt
Wed, Mar 18 · 20:19–04:53
🌛Moon Altitude:-43.2--17.3°
Medium
Pristine Dark Skies (pristine)
Zermatt
Thu, Mar 19 · 20:20–02:00
🌛Moon Altitude:-36.6--4.7°
Medium
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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° |
|---|---|---|---|---|---|---|
| Sun, Mar 15 | ||||||
| 05:00 | ✓ | 100% | 101m | 100% | 14% | -1.9° |
| 06:00 | ✕ | 100% | 103m | 100% | 14% | 6.5° |
| 07:00 | ✕ | 100% | 120m | 100% | 14% | 14° |
| 08:00 | ✕ | 100% | 165m | 97% | 14% | 19° |
| 09:00 | ✕ | 87% | 592m | 94% | 14% | 23° |
| 10:00 | ✕ | 100% | 639m | 92% | 14% | 23° |
| 11:00 | ✕ | 100% | 1183m | 92% | 14% | 22° |
| 12:00 | ✕ | 76% | 3958m | 93% | 14% | 18° |
| 13:00 | ✕ | 82% | 2081m | 94% | 14% | 12° |
| 14:00 | ✕ | 84% | 1193m | 75% | 14% | 4.1° |
| 15:00 | ✕ | 91% | 556m | 56% | 14% | -4.6° |
| 16:00 | ✕ | 91% | 347m | 38% | 14% | -14° |
| 17:00 | ✕ | 95% | 335m | 40% | 14% | -24° |
| 18:00 | ✕ | 95% | 231m | 43% | 14% | -34° |
| 19:00 | ✕ | 100% | 358m | 46% | 14% | -43° |
| 20:00 | ✓ | 100% | 1793m | 31% | 14% | -52° |
| 21:00 | ✓ | 100% | 2908m | 15% | 14% | -59° |
| 22:00 | ✓ | 100% | 1582m | 0% | 14% | -62° |
| 23:00 | ✓ | 77% | 2204m | 0% | 14% | -60° |
| Mon, Mar 16 | ||||||
| 24:00 | ✓ | 80% | 2265m | 0% | 14% | -54° |
| 01:00 | ✓ | 44% | 11354m | 0% | 7.9% | -46° |
| 02:00 | ✓ | 50% | 10287m | 0% | 7.9% | -36° |
| 03:00 | ✓ | 96% | 3573m | 0% | 7.9% | -26° |
| 04:00 | ✓ | 100% | 2332m | 0% | 7.9% | -16° |
| 05:00 | ✕ | 65% | 1927m | 0% | 7.9% | -5.8° |
| 06:00 | ✕ | 19% | 5000m | 0% | 7.9% | 3.6° |
| 07:00 | ✕ | 5.5% | 23811m | 0% | 7.9% | 12° |
| 08:00 | ✕ | 0.1% | 24134m | 0% | 7.9% | 19° |
| 09:00 | ✕ | 3.8% | 24134m | 0% | 7.9% | 25° |
| 10:00 | ✕ | 4.8% | 24135m | 0% | 7.9% | 28° |
| 11:00 | ✕ | 55% | 24135m | 0% | 7.9% | 28° |
| 12:00 | ✕ | 91% | 24134m | 0% | 7.9% | 26° |
| 13:00 | ✕ | 100% | 24134m | 0% | 7.9% | 21° |
| 14:00 | ✕ | 100% | 24134m | 0% | 7.9% | 15° |
| 15:00 | ✕ | 100% | 24135m | 0% | 7.9% | 6.4° |
| 16:00 | ✕ | 80% | 24134m | 0% | 7.9% | -2.6° |
| 17:00 | ✕ | 12% | 24135m | 0% | 7.9% | -12° |
| 18:00 | ✕ | 100% | 24135m | 0% | 7.9% | -22° |
| 19:00 | ✕ | 100% | 24134m | 0% | 7.9% | -32° |
| 20:00 | ✓ | 48% | 24134m | 0% | 7.9% | -41° |
| 21:00 | ✓ | 14% | 24135m | 0% | 7.9% | -49° |
| 22:00 | ✓ | 13% | 24134m | 0% | 7.9% | -55° |
| 23:00 | ✓ | 33% | 24135m | 0% | 7.9% | -57° |
| Tue, Mar 17 | ||||||
| 24:00 | ✓ | 37% | 24134m | 0% | 7.9% | -54° |
| 01:00 | ✓ | 11% | 24135m | 0% | 2.9% | -48° |
| 02:00 | ✓ | 84% | 24134m | 0% | 2.9% | -39° |
| 03:00 | ✓ | 100% | 24135m | 0% | 2.9% | -30° |
| 04:00 | ✓ | 94% | 24134m | 0% | 2.9% | -20° |
| 05:00 | ✕ | 100% | 24135m | 0% | 2.9% | -9.5° |
| 06:00 | ✕ | 100% | 24135m | 0% | 2.9% | 0.53° |
| 07:00 | ✕ | 100% | 24135m | 0% | 2.9% | 10° |
| 08:00 | ✕ | 100% | 24135m | 0% | 2.9% | 19° |
| 09:00 | ✕ | 100% | 24135m | 0% | 2.9% | 26° |
| 10:00 | ✕ | 100% | 24134m | 0% | 2.9% | 31° |
| 11:00 | ✕ | 86% | 21479m | 0% | 2.9% | 34° |
| 12:00 | ✕ | 53% | 21442m | 0% | 2.9% | 34° |
| 13:00 | ✕ | 34% | 269m | 0% | 2.9% | 31° |
| 14:00 | ✕ | 37% | 149m | 0% | 2.9% | 25° |
| 15:00 | ✕ | 36% | 390m | 0% | 2.9% | 18° |
| 16:00 | ✕ | 5.1% | 21655m | 0% | 2.9% | 9.1° |
| 17:00 | ✕ | 59% | 24135m | 0% | 2.9% | -0.36° |
| 18:00 | ✕ | 77% | 24135m | 0% | 2.9% | -10° |
| 19:00 | ✕ | 9.5% | 24134m | 0% | 2.9% | -20° |
| 20:00 | ✓ | 8% | 24134m | 0% | 2.9% | -30° |
| 21:00 | ✓ | 6.5% | 24135m | 0% | 2.9% | -38° |
| 22:00 | ✓ | 5% | 24135m | 0% | 2.9% | -45° |
| 23:00 | ✓ | 5% | 24135m | 0% | 2.9% | -49° |
| Wed, Mar 18 | ||||||
| 24:00 | ✓ | 5% | 24135m | 0% | 2.9% | -50° |
| 01:00 | ✓ | 5% | 24135m | 0% | 0.4% | -47° |
| 02:00 | ✓ | 5.5% | 24135m | 0% | 0.4% | -41° |
| 03:00 | ✓ | 6% | 24135m | 0% | 0.4% | -32° |
| 04:00 | ✓ | 6.5% | 24135m | 0% | 0.4% | -23° |
| 05:00 | ✕ | 38% | 16101m | 0% | 0.4% | -13° |
| 06:00 | ✕ | 69% | 8066m | 0% | 0.4% | -2.6° |
| 07:00 | ✕ | 100% | 31m | 0% | 0.4% | 7.6° |
| 08:00 | ✕ | 72% | 732m | 13% | 0.4% | 17° |
| 09:00 | ✕ | 45% | 1432m | 26% | 0.4% | 26° |
| 10:00 | ✕ | 17% | 2133m | 39% | 0.4% | 33° |
| 11:00 | ✕ | 14% | 9467m | 33% | 0.4% | 39° |
| 12:00 | ✕ | 10% | 16800m | 28% | 0.4% | 41° |
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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