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
Pristine Dark Skies (pristine)
St. Moritz
Tomorrow · 04:00–04:25 · 1h window
Medium confidence
61%
🌛Moon Altitude-12°
☁️Total Cloud Coverage3.4%
Pristine Dark Skies (pristine)
St. Moritz
Tomorrow · 22:14–04:23
🌛Moon Altitude:-8.8-44.1°
Medium
Excellent Dark Skies (pristine)
St. Moritz
Sun, Apr 26 · 04:00–04:16
🌛Moon Altitude:1.1°
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° |
|---|---|---|---|---|---|---|
| Mon, Apr 20 | ||||||
| 21:00 | ✕ | 8.2% | 24135m | 0% | 12% | 34° |
| 22:00 | ✓ | 5% | 24134m | 0% | 12% | 24° |
| 23:00 | ✓ | 25% | 11510m | 0% | 12% | 15° |
| Tue, Apr 21 | ||||||
| 24:00 | ✓ | 51% | 4274m | 0% | 12% | 6.4° |
| 01:00 | ✓ | 60% | 15351m | 0% | 12% | -1.1° |
| 02:00 | ✓ | 70% | 3449m | 0% | 21% | -7.4° |
| 03:00 | ✓ | 64% | 391m | 0% | 21% | -12° |
| 04:00 | ✓ | 58% | 1000m | 0% | 21% | -15° |
| 05:00 | ✕ | 48% | 3532m | 0% | 21% | -15° |
| 06:00 | ✕ | 41% | 23288m | 13% | 21% | -14° |
| 07:00 | ✕ | 43% | 8826m | 26% | 21% | -9.8° |
| 08:00 | ✕ | 31% | 7232m | 39% | 21% | -4.2° |
| 09:00 | ✕ | 31% | 24134m | 53% | 21% | 2.8° |
| 10:00 | ✕ | 21% | 24135m | 67% | 21% | 11° |
| 11:00 | ✕ | 36% | 24135m | 80% | 21% | 20° |
| 12:00 | ✕ | 58% | 22750m | 78% | 21% | 29° |
| 13:00 | ✕ | 43% | 15993m | 76% | 21% | 39° |
| 14:00 | ✕ | 54% | 18385m | 74% | 21% | 49° |
| 15:00 | ✕ | 40% | 22083m | 55% | 21% | 59° |
| 16:00 | ✕ | 19% | 24134m | 28% | 21% | 67° |
| 17:00 | ✕ | 35% | 24134m | 0% | 21% | 71° |
| 18:00 | ✕ | 71% | 24134m | 0% | 21% | 70° |
| 19:00 | ✕ | 31% | 24135m | 0% | 21% | 63° |
| 20:00 | ✕ | 27% | 24134m | 0% | 21% | 54° |
| 21:00 | ✕ | 24% | 24134m | 3.3% | 21% | 45° |
| 22:00 | ✓ | 17% | 6784m | 6.7% | 21% | 35° |
| 23:00 | ✓ | 35% | 3776m | 10% | 21% | 25° |
| Wed, Apr 22 | ||||||
| 24:00 | ✓ | 41% | 3097m | 6.7% | 21% | 16° |
| 01:00 | ✓ | 45% | 3086m | 3.3% | 21% | 7.1° |
| 02:00 | ✓ | 42% | 3389m | 0% | 32% | -0.6° |
| 03:00 | ✓ | 23% | 14446m | 1.6% | 32% | -7.1° |
| 04:00 | ✓ | 3.4% | 24134m | 3.3% | 32% | -12° |
| 05:00 | ✕ | 3.1% | 24135m | 4.9% | 32% | -15° |
| 06:00 | ✕ | 2.6% | 24134m | 3.3% | 32% | -16° |
| 07:00 | ✕ | 1% | 24135m | 1.6% | 32% | -14° |
| 08:00 | ✕ | 0% | 24134m | 0% | 32% | -11° |
| 09:00 | ✕ | 0% | 24134m | 13% | 32% | -5.2° |
| 10:00 | ✕ | 0.4% | 24134m | 26% | 32% | 1.7° |
| 11:00 | ✕ | 1.3% | 24135m | 39% | 32% | 9.8° |
| 12:00 | ✕ | 8.5% | 24134m | 39% | 32% | 19° |
| 13:00 | ✕ | 5.7% | 24134m | 39% | 32% | 28° |
| 14:00 | ✕ | 8.3% | 24135m | 39% | 32% | 38° |
| 15:00 | ✕ | 24% | 24135m | 26% | 32% | 48° |
| 16:00 | ✕ | 16% | 24135m | 13% | 32% | 57° |
| 17:00 | ✕ | 2.8% | 24135m | 0% | 32% | 65° |
| 18:00 | ✕ | 0.2% | 24135m | 0% | 32% | 70° |
| 19:00 | ✕ | 0% | 24134m | 0% | 32% | 69° |
| 20:00 | ✕ | 0.3% | 24134m | 0% | 32% | 63° |
| 21:00 | ✕ | 0% | 24134m | 0% | 32% | 54° |
| 22:00 | ✓ | 0% | 24134m | 0% | 32% | 44° |
| 23:00 | ✓ | 0% | 24135m | 0% | 32% | 34° |
| Thu, Apr 23 | ||||||
| 24:00 | ✓ | 0% | 24135m | 0% | 32% | 24° |
| 01:00 | ✓ | 0% | 24135m | 0% | 32% | 15° |
| 02:00 | ✓ | 0% | 24134m | 0% | 43% | 5.9° |
| 03:00 | ✓ | 0% | 24135m | 0% | 43% | -2.1° |
| 04:00 | ✓ | 0% | 24135m | 0% | 43% | -8.8° |
| 05:00 | ✕ | 0% | 24135m | 0% | 43% | -14° |
| 06:00 | ✕ | 0% | 24135m | 0% | 43% | -17° |
| 07:00 | ✕ | 0% | 24135m | 0% | 43% | -18° |
| 08:00 | ✕ | 0% | 24135m | 0% | 43% | -17° |
| 09:00 | ✕ | 1.1% | 24135m | 0% | 43% | -13° |
| 10:00 | ✕ | 5% | 24134m | 0% | 43% | -7.5° |
| 11:00 | ✕ | 5% | 24135m | 0% | 43% | -0.49° |
| 12:00 | ✕ | 4.3% | 24135m | 0% | 43% | 7.7° |
| 13:00 | ✕ | 5% | 24135m | 0% | 43% | 17° |
| 14:00 | ✕ | 5% | 24134m | 0% | 43% | 26° |
| 15:00 | ✕ | 5% | 24135m | 0% | 43% | 36° |
| 16:00 | ✕ | 0% | 24135m | 0% | 43% | 46° |
| 17:00 | ✕ | 0% | 24134m | 0% | 43% | 55° |
| 18:00 | ✕ | 0% | 24135m | 0% | 43% | 63° |
| 19:00 | ✕ | 0% | 24134m | 0% | 43% | 67° |
| 20:00 | ✕ | 5% | 24134m | 0% | 43% | 66° |
| 21:00 | ✕ | 1.3% | 24134m | 0% | 43% | 60° |
| 22:00 | ✓ | 5% | 24134m | 0% | 43% | 51° |
| 23:00 | ✓ | 5.1% | 24134m | 0% | 43% | 42° |
| Fri, Apr 24 | ||||||
| 24:00 | ✓ | 27% | 24135m | 0% | 43% | 32° |
| 01:00 | ✓ | 100% | 24135m | 0% | 43% | 22° |
| 02:00 | ✓ | 100% | 24135m | 0% | 54% | 12° |
| 03:00 | ✓ | 68% | 24135m | 0% | 54% | 2.8° |
| 04:00 | ✓ | 37% | 24135m | 0% | 54% | -5.5° |
| 05:00 | ✕ | 5% | 24135m | 0% | 54% | -13° |
| 06:00 | ✕ | 5% | 24135m | 0% | 54% | -18° |
| 07:00 | ✕ | 5% | 24135m | 0% | 54% | -21° |
| 08:00 | ✕ | 5% | 24135m | 0% | 54% | -22° |
| 09:00 | ✕ | 24% | 24135m | 0% | 54% | -20° |
| 10:00 | ✕ | 42% | 24135m | 0% | 54% | -17° |
| 11:00 | ✕ | 61% | 24135m | 0% | 54% | -11° |
| 12:00 | ✕ | 42% | 24135m | 0% | 54% | -3.3° |
| 13:00 | ✕ | 24% | 24135m | 0% | 54% | 5.2° |
| 14:00 | ✕ | 5% | 24135m | 0% | 54% | 14° |
| 15:00 | ✕ | 5% | 24135m | 0% | 54% | 24° |
| 16:00 | ✕ | 5% | 24135m | 0% | 54% | 34° |
| 17:00 | ✕ | 5% | 24135m | 0% | 54% | 44° |
| 18:00 | ✕ | 19% | 24135m | 0% | 54% | 52° |
| 19:00 | ✕ | 33% | 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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