Rule
Dark Skies
St. Moritz - Dark Skies - Alps
Saint Moritz, Canton Grisons, 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)
St. Moritz
Today · 19:52–22:00 · 2h window
Medium confidence
44%
🌛Moon Altitude-17-2.5°
☁️Total Cloud Coverage6.5-14.3%
Good Dark Skies
St. Moritz
Sat, Mar 7 · 22:00–01:00
🌛Moon Altitude:-9.6-7.7°
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° |
|---|---|---|---|---|---|---|
| Wed, Mar 4 | ||||||
| 05:00 | ✓ | 5% | 24134m | 0% | 99% | 22° |
| 06:00 | ✕ | 2.1% | 24134m | 0% | 99% | 12° |
| 07:00 | ✕ | 0% | 24134m | 0% | 99% | 2° |
| 08:00 | ✕ | 0% | 24135m | 0% | 99% | -8.2° |
| 09:00 | ✕ | 0% | 24135m | 0% | 99% | -18° |
| 10:00 | ✕ | 0% | 24134m | 0% | 99% | -27° |
| 11:00 | ✕ | 0.3% | 24135m | 0% | 99% | -35° |
| 12:00 | ✕ | 0.4% | 24134m | 0% | 99% | -40° |
| 13:00 | ✕ | 5.1% | 24134m | 0% | 99% | -43° |
| 14:00 | ✕ | 5% | 24134m | 0% | 99% | -43° |
| 15:00 | ✕ | 5.5% | 24134m | 0% | 99% | -39° |
| 16:00 | ✕ | 2.7% | 24135m | 0% | 99% | -33° |
| 17:00 | ✕ | 2.6% | 24135m | 0% | 99% | -24° |
| 18:00 | ✕ | 2.7% | 24135m | 0% | 99% | -15° |
| 19:00 | ✓ | 4.6% | 24135m | 0% | 99% | -5.5° |
| 20:00 | ✓ | 9.7% | 24135m | 0% | 99% | 4.3° |
| 21:00 | ✓ | 8.8% | 24134m | 0% | 99% | 14° |
| 22:00 | ✓ | 7.8% | 24134m | 0% | 99% | 23° |
| 23:00 | ✓ | 6.1% | 15822m | 0% | 99% | 31° |
| Thu, Mar 5 | ||||||
| 24:00 | ✓ | 21% | 13588m | 0% | 99% | 37° |
| 01:00 | ✓ | 17% | 13995m | 0% | 96% | 40° |
| 02:00 | ✓ | 6.9% | 24135m | 0% | 96% | 40° |
| 03:00 | ✓ | 8.6% | 24134m | 0% | 96% | 37° |
| 04:00 | ✓ | 5% | 24134m | 0% | 96% | 31° |
| 05:00 | ✓ | 5.9% | 24134m | 0% | 96% | 23° |
| 06:00 | ✕ | 5% | 24135m | 0% | 96% | 14° |
| 07:00 | ✕ | 5% | 24134m | 0% | 96% | 4.6° |
| 08:00 | ✕ | 4% | 24135m | 0% | 96% | -5.5° |
| 09:00 | ✕ | 5% | 24135m | 0% | 96% | -16° |
| 10:00 | ✕ | 15% | 24134m | 0% | 96% | -26° |
| 11:00 | ✕ | 86% | 24134m | 0% | 96% | -35° |
| 12:00 | ✕ | 95% | 24134m | 0% | 96% | -42° |
| 13:00 | ✕ | 32% | 24135m | 0% | 96% | -48° |
| 14:00 | ✕ | 100% | 24134m | 0% | 96% | -50° |
| 15:00 | ✕ | 100% | 24134m | 0% | 96% | -48° |
| 16:00 | ✕ | 100% | 24134m | 0% | 96% | -43° |
| 17:00 | ✕ | 100% | 24135m | 0% | 96% | -35° |
| 18:00 | ✕ | 6.2% | 24135m | 0% | 96% | -27° |
| 19:00 | ✓ | 6.5% | 21607m | 0% | 96% | -17° |
| 20:00 | ✓ | 14% | 21420m | 0% | 96% | -7.2° |
| 21:00 | ✓ | 12% | 21432m | 0% | 96% | 2.5° |
| 22:00 | ✓ | 75% | 21437m | 0% | 96% | 12° |
| 23:00 | ✓ | 100% | 21434m | 0% | 96% | 20° |
| Fri, Mar 6 | ||||||
| 24:00 | ✓ | 100% | 21432m | 0% | 96% | 27° |
| 01:00 | ✓ | 98% | 21465m | 0% | 90% | 32° |
| 02:00 | ✓ | 100% | 21463m | 0% | 90% | 34° |
| 03:00 | ✓ | 88% | 22343m | 0% | 90% | 33° |
| 04:00 | ✓ | 96% | 24134m | 0% | 90% | 30° |
| 05:00 | ✓ | 100% | 24134m | 0% | 90% | 24° |
| 06:00 | ✕ | 100% | 24134m | 0% | 90% | 16° |
| 07:00 | ✕ | 100% | 24135m | 0% | 90% | 7.1° |
| 08:00 | ✕ | 100% | 24134m | 0% | 90% | -2.6° |
| 09:00 | ✕ | 100% | 24135m | 0% | 90% | -13° |
| 10:00 | ✕ | 100% | 24134m | 0% | 90% | -23° |
| 11:00 | ✕ | 100% | 24134m | 0% | 90% | -33° |
| 12:00 | ✕ | 100% | 24135m | 0% | 90% | -42° |
| 13:00 | ✕ | 100% | 24134m | 0% | 90% | -50° |
| 14:00 | ✕ | 100% | 24134m | 0% | 90% | -54° |
| 15:00 | ✕ | 100% | 24135m | 0% | 90% | -56° |
| 16:00 | ✕ | 100% | 24134m | 0% | 90% | -52° |
| 17:00 | ✕ | 100% | 24134m | 0% | 90% | -46° |
| 18:00 | ✕ | 100% | 24134m | 0% | 90% | -38° |
| 19:00 | ✓ | 100% | 24135m | 0% | 90% | -28° |
| 20:00 | ✓ | 100% | 24135m | 0% | 90% | -18° |
| 21:00 | ✓ | 100% | 24134m | 0% | 90% | -8.5° |
| 22:00 | ✓ | 100% | 24134m | 0% | 90% | 0.93° |
| 23:00 | ✓ | 89% | 24134m | 0% | 90% | 9.7° |
| Sat, Mar 7 | ||||||
| 24:00 | ✓ | 53% | 24135m | 0% | 90% | 17° |
| 01:00 | ✓ | 35% | 24135m | 0% | 84% | 23° |
| 02:00 | ✓ | 94% | 24135m | 0% | 84% | 27° |
| 03:00 | ✓ | 78% | 21707m | 0% | 84% | 29° |
| 04:00 | ✓ | 88% | 24134m | 0% | 84% | 27° |
| 05:00 | ✓ | 17% | 21474m | 0% | 84% | 23° |
| 06:00 | ✕ | 14% | 12735m | 0% | 84% | 17° |
| 07:00 | ✕ | 17% | 11112m | 0% | 84% | 9.2° |
| 08:00 | ✕ | 14% | 15453m | 0% | 84% | 0.31° |
| 09:00 | ✕ | 11% | 19794m | 0% | 84% | -9.3° |
| 10:00 | ✕ | 7.6% | 24135m | 0% | 84% | -19° |
| 11:00 | ✕ | 13% | 24135m | 13% | 84% | -30° |
| 12:00 | ✕ | 19% | 24135m | 26% | 84% | -39° |
| 13:00 | ✕ | 25% | 24135m | 39% | 84% | -49° |
| 14:00 | ✕ | 26% | 24135m | 26% | 84% | -56° |
| 15:00 | ✕ | 28% | 24135m | 13% | 84% | -60° |
| 16:00 | ✕ | 29% | 24135m | 0% | 84% | -60° |
| 17:00 | ✕ | 28% | 21701m | 13% | 84% | -56° |
| 18:00 | ✕ | 26% | 19267m | 26% | 84% | -48° |
| 19:00 | ✓ | 25% | 16832m | 39% | 84% | -39° |
| 20:00 | ✓ | 21% | 17245m | 26% | 84% | -29° |
| 21:00 | ✓ | 16% | 17657m | 13% | 84% | -19° |
| 22:00 | ✓ | 11% | 18069m | 0% | 84% | -9.6° |
| 23:00 | ✓ | 14% | 18156m | 0% | 84% | -0.52° |
| Sun, Mar 8 | ||||||
| 24:00 | ✓ | 17% | 18244m | 0% | 84% | 7.7° |
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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