Rule
Dark Skies
Matterhorn - Dark Skies - Alps
Zermatt, Valais, Switzerland
Moonless nights with crystal-clear skies for Milky Way shots
Upcoming Opportunities
When all conditions match, PhotoWeather marks an opportunity window.
Times shown in Europe/Zurich
Next opportunity
Dark Skies
Matterhorn
Today · 23:00–24:00 · 1h window
Medium confidence
68%
Dark Skies
Matterhorn
Tue, Jan 13 · 03:00–05:00
Medium
Dark Skies
Matterhorn
Tue, Jan 13 · 06:00–06:21
High
Dark Skies
Matterhorn
Wed, Jan 14 · 24:00–01:00
Medium
Dark Skies
Matterhorn
Thu, Jan 15 · 18:56–19:00
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, Jan 11 | ||||||
| 19:00 | ✓ | 100% | 74200m | 0% | 41% | -61° |
| 20:00 | ✓ | 100% | 75620m | 0% | 41% | -59° |
| 21:00 | ✓ | 100% | 75840m | 0% | 41% | -53° |
| 22:00 | ✓ | 94% | 75780m | 0% | 41% | -44° |
| 23:00 | ✓ | 20% | 75540m | 0% | 41% | -35° |
| Mon, Jan 12 | ||||||
| 24:00 | ✓ | 47% | 75160m | 0% | 41% | -25° |
| 01:00 | ✓ | 67% | 73120m | 0% | 33% | -15° |
| 02:00 | ✓ | 76% | 71240m | 8% | 33% | -5.4° |
| 03:00 | ✓ | 77% | 70220m | 23% | 33% | 3.6° |
| 04:00 | ✓ | 82% | 63860m | 43% | 33% | 12° |
| 05:00 | ✓ | 82% | 54300m | 63% | 33% | 18° |
| 06:00 | ✓ | 100% | 43640m | 88% | 33% | 23° |
| 07:00 | ✕ | 87% | 35120m | 90% | 33% | 25° |
| 08:00 | ✕ | 100% | 19000m | 73% | 33% | 25° |
| 09:00 | ✕ | 97% | 24460m | 48% | 33% | 22° |
| 10:00 | ✕ | 77% | 49200m | 25% | 33% | 16° |
| 11:00 | ✕ | 26% | 54880m | 5% | 33% | 9.3° |
| 12:00 | ✕ | 68% | 60980m | 3% | 33% | 0.92° |
| 13:00 | ✕ | 37% | 67400m | 5% | 33% | -8.3° |
| 14:00 | ✕ | 62% | 67800m | 10% | 33% | -18° |
| 15:00 | ✕ | 42% | 71700m | 3% | 33% | -28° |
| 16:00 | ✕ | 90% | 72400m | 5% | 33% | -39° |
| 17:00 | ✕ | 100% | 63380m | 5% | 33% | -48° |
| 18:00 | ✓ | 57% | 66620m | 8% | 33% | -57° |
| 19:00 | ✓ | 62% | 65340m | 3% | 33% | -63° |
| 20:00 | ✓ | 84% | 64720m | 0% | 33% | -65° |
| 21:00 | ✓ | 83% | 65920m | 0% | 33% | -61° |
| 22:00 | ✓ | 54% | 66360m | 0% | 33% | -54° |
| 23:00 | ✓ | 31% | 70020m | 0% | 33% | -45° |
| Tue, Jan 13 | ||||||
| 24:00 | ✓ | 100% | 72400m | 0% | 33% | -35° |
| 01:00 | ✓ | 30% | 75100m | 0% | 24% | -25° |
| 02:00 | ✓ | 22% | 75620m | 0% | 24% | -15° |
| 03:00 | ✓ | 5% | 75740m | 0% | 24% | -6.1° |
| 04:00 | ✓ | 3% | 75400m | 0% | 24% | 2.4° |
| 05:00 | ✓ | 72% | 75780m | 0% | 24% | 9.8° |
| 06:00 | ✓ | 5% | 75660m | 0% | 24% | 16° |
| 07:00 | ✕ | 41% | 75240m | 0% | 24% | 19° |
| 08:00 | ✕ | 19% | 73820m | 0% | 24% | 21° |
| 09:00 | ✕ | 47% | 74360m | 0% | 24% | 20° |
| 10:00 | ✕ | 63% | 75360m | 0% | 24% | 17° |
| 11:00 | ✕ | 100% | 75520m | 0% | 24% | 11° |
| 12:00 | ✕ | 31% | 75740m | 0% | 24% | 4.2° |
| 13:00 | ✕ | 28% | 77780m | 0% | 24% | -4.1° |
| 14:00 | ✕ | 100% | 78055m | 0% | 24% | -13° |
| 15:00 | ✕ | 100% | 77670m | 0% | 24% | -23° |
| 16:00 | ✕ | 100% | 77605m | 0% | 24% | -33° |
| 17:00 | ✕ | 98% | 77660m | 0% | 24% | -43° |
| 18:00 | ✓ | 100% | 77960m | 0% | 24% | -53° |
| 19:00 | ✓ | 100% | 77900m | 0% | 24% | -62° |
| 20:00 | ✓ | 97% | 77060m | 0% | 24% | -68° |
| 21:00 | ✓ | 48% | 76380m | 0% | 24% | -68° |
| 22:00 | ✓ | 34% | 76280m | 0% | 24% | -63° |
| 23:00 | ✓ | 44% | 76260m | 0% | 24% | -55° |
| Wed, Jan 14 | ||||||
| 24:00 | ✓ | 10% | 75960m | 0% | 24% | -45° |
| 01:00 | ✓ | 100% | 75900m | 0% | 16% | -35° |
| 02:00 | ✓ | 100% | 75880m | 0% | 16% | -25° |
| 03:00 | ✓ | 100% | 75860m | 0% | 16% | -16° |
| 04:00 | ✓ | 100% | 76120m | 0% | 16% | -6.7° |
| 05:00 | ✓ | 100% | 77960m | 0% | 16% | 1.4° |
| 06:00 | ✓ | 100% | 78560m | 0% | 16% | 8.4° |
| 07:00 | ✕ | 100% | 78940m | 0% | 16% | 14° |
| 08:00 | ✕ | 100% | 78200m | 1% | 16% | 17° |
| 09:00 | ✕ | 100% | 76940m | 3% | 16% | 18° |
| 10:00 | ✕ | 100% | 76280m | 5% | 16% | 17° |
| 11:00 | ✕ | 100% | 74100m | 5% | 16% | 13° |
| 12:00 | ✕ | 96% | 70420m | 7% | 16% | 7.5° |
| 13:00 | ✕ | 73% | 71360m | 10% | 16% | 0.35° |
| 14:00 | ✕ | 83% | 73260m | 14% | 16% | -7.9° |
| 15:00 | ✕ | 92% | 71060m | 20% | 16% | -17° |
| 16:00 | ✕ | 100% | 66960m | 26% | 16% | -27° |
| 17:00 | ✕ | 100% | 63840m | 31% | 16% | -37° |
| 18:00 | ✓ | 98% | 48580m | 36% | 16% | -47° |
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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