Rule
Dark Skies
Grindelwald - Dark Skies - Alps
Grindelwald, Bern, 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)
Grindelwald
Sun, Mar 15 · 23:00–02:00 · 3h window
Low confidence
39%
🌛Moon Altitude-59.6--45.3°
☁️Total Cloud Coverage7.5-18.6%
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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° |
|---|---|---|---|---|---|---|
| Thu, Mar 12 | ||||||
| 02:00 | ✓ | 100% | 40m | 74% | 39% | -11° |
| 03:00 | ✓ | 100% | 56m | 48% | 39% | -3° |
| 04:00 | ✓ | 100% | 152m | 22% | 39% | 4° |
| 05:00 | ✓ | 100% | 260m | 39% | 39% | 9.6° |
| 06:00 | ✕ | 100% | 188m | 39% | 39% | 13° |
| 07:00 | ✕ | 100% | 390m | 39% | 39% | 15° |
| 08:00 | ✕ | 100% | 3071m | 26% | 39% | 14° |
| 09:00 | ✕ | 100% | 22607m | 13% | 39% | 12° |
| 10:00 | ✕ | 77% | 24134m | 0% | 39% | 6.7° |
| 11:00 | ✕ | 30% | 24134m | 13% | 39% | 0.3° |
| 12:00 | ✕ | 27% | 24134m | 26% | 39% | -7.4° |
| 13:00 | ✕ | 44% | 24135m | 39% | 39% | -16° |
| 14:00 | ✕ | 45% | 24135m | 0% | 39% | -25° |
| 15:00 | ✕ | 60% | 19974m | 0% | 39% | -35° |
| 16:00 | ✕ | 65% | 19526m | 0% | 39% | -45° |
| 17:00 | ✕ | 25% | 24134m | 0% | 39% | -55° |
| 18:00 | ✕ | 22% | 24135m | 0% | 39% | -64° |
| 19:00 | ✕ | 45% | 19953m | 0% | 39% | -70° |
| 20:00 | ✓ | 22% | 20415m | 0% | 39% | -71° |
| 21:00 | ✓ | 2.5% | 24135m | 0% | 39% | -66° |
| 22:00 | ✓ | 1.3% | 24135m | 0% | 39% | -57° |
| 23:00 | ✓ | 1.7% | 24134m | 0% | 39% | -48° |
| Fri, Mar 13 | ||||||
| 24:00 | ✓ | 8.3% | 24135m | 0% | 39% | -38° |
| 01:00 | ✓ | 9.9% | 22029m | 0% | 30% | -28° |
| 02:00 | ✓ | 14% | 21711m | 0% | 30% | -18° |
| 03:00 | ✓ | 13% | 20724m | 0% | 30% | -9.4° |
| 04:00 | ✓ | 11% | 13409m | 0% | 30% | -1.2° |
| 05:00 | ✓ | 5.3% | 24135m | 0% | 30% | 5.8° |
| 06:00 | ✕ | 6% | 24135m | 0% | 30% | 11° |
| 07:00 | ✕ | 7.5% | 24134m | 0% | 30% | 15° |
| 08:00 | ✕ | 7.5% | 24135m | 0% | 30% | 16° |
| 09:00 | ✕ | 15% | 21449m | 0% | 30% | 15° |
| 10:00 | ✕ | 13% | 24134m | 0% | 30% | 12° |
| 11:00 | ✕ | 11% | 24135m | 0% | 30% | 7.2° |
| 12:00 | ✕ | 49% | 24135m | 0% | 30% | 0.52° |
| 13:00 | ✕ | 100% | 24135m | 0% | 30% | -7.4° |
| 14:00 | ✕ | 89% | 24134m | 13% | 30% | -16° |
| 15:00 | ✕ | 100% | 24135m | 26% | 30% | -26° |
| 16:00 | ✕ | 91% | 24134m | 39% | 30% | -35° |
| 17:00 | ✕ | 98% | 19807m | 59% | 30% | -45° |
| 18:00 | ✕ | 92% | 2037m | 79% | 30% | -55° |
| 19:00 | ✕ | 98% | 520m | 99% | 30% | -63° |
| 20:00 | ✓ | 100% | 394m | 99% | 30% | -69° |
| 21:00 | ✓ | 100% | 5811m | 100% | 30% | -68° |
| 22:00 | ✓ | 100% | 5440m | 100% | 30% | -63° |
| 23:00 | ✓ | 100% | 1587m | 100% | 30% | -55° |
| Sat, Mar 14 | ||||||
| 24:00 | ✓ | 100% | 339m | 100% | 30% | -45° |
| 01:00 | ✓ | 100% | 295m | 100% | 22% | -35° |
| 02:00 | ✓ | 100% | 218m | 100% | 22% | -25° |
| 03:00 | ✓ | 100% | 62m | 99% | 22% | -15° |
| 04:00 | ✓ | 100% | 113m | 99% | 22% | -6.3° |
| 05:00 | ✓ | 100% | 301m | 100% | 22% | 1.9° |
| 06:00 | ✕ | 100% | 198m | 100% | 22% | 8.9° |
| 07:00 | ✕ | 100% | 104m | 100% | 22% | 14° |
| 08:00 | ✕ | 99% | 190m | 100% | 22% | 18° |
| 09:00 | ✕ | 100% | 215m | 100% | 22% | 19° |
| 10:00 | ✕ | 100% | 113m | 100% | 22% | 18° |
| 11:00 | ✕ | 100% | 99m | 100% | 22% | 14° |
| 12:00 | ✕ | 100% | 107m | 100% | 22% | 8.7° |
| 13:00 | ✕ | 100% | 122m | 100% | 22% | 1.7° |
| 14:00 | ✕ | 100% | 87m | 100% | 22% | -6.5° |
| 15:00 | ✕ | 100% | 79m | 100% | 22% | -16° |
| 16:00 | ✕ | 100% | 78m | 100% | 22% | -25° |
| 17:00 | ✕ | 100% | 84m | 100% | 22% | -35° |
| 18:00 | ✕ | 100% | 93m | 100% | 22% | -45° |
| 19:00 | ✕ | 100% | 99m | 100% | 22% | -54° |
| 20:00 | ✓ | 100% | 102m | 100% | 22% | -61° |
| 21:00 | ✓ | 100% | 110m | 100% | 22% | -66° |
| 22:00 | ✓ | 100% | 116m | 100% | 22% | -65° |
| 23:00 | ✓ | 100% | 128m | 100% | 22% | -59° |
| Sun, Mar 15 | ||||||
| 24:00 | ✓ | 100% | 128m | 100% | 22% | -51° |
| 01:00 | ✓ | 100% | 112m | 100% | 14% | -41° |
| 02:00 | ✓ | 100% | 113m | 96% | 14% | -31° |
| 03:00 | ✓ | 100% | 115m | 92% | 14% | -21° |
| 04:00 | ✓ | 100% | 120m | 89% | 14% | -11° |
| 05:00 | ✕ | 100% | 132m | 91% | 14% | -2° |
| 06:00 | ✕ | 100% | 146m | 94% | 14% | 6.3° |
| 07:00 | ✕ | 100% | 171m | 96% | 14% | 13° |
| 08:00 | ✕ | 96% | 4284m | 92% | 14% | 19° |
| 09:00 | ✕ | 91% | 8396m | 88% | 14% | 22° |
| 10:00 | ✕ | 87% | 12509m | 83% | 14% | 23° |
| 11:00 | ✕ | 91% | 8518m | 85% | 14% | 21° |
| 12:00 | ✕ | 96% | 4526m | 88% | 14% | 17° |
| 13:00 | ✕ | 100% | 535m | 90% | 14% | 11° |
| 14:00 | ✕ | 90% | 1396m | 73% | 14% | 3.6° |
| 15:00 | ✕ | 80% | 2257m | 56% | 14% | -5° |
| 16:00 | ✕ | 71% | 3119m | 39% | 14% | -14° |
| 17:00 | ✕ | 75% | 6565m | 45% | 14% | -24° |
| 18:00 | ✕ | 79% | 10012m | 50% | 14% | -34° |
| 19:00 | ✕ | 83% | 13459m | 56% | 14% | -43° |
| 20:00 | ✓ | 63% | 14292m | 40% | 14% | -52° |
| 21:00 | ✓ | 44% | 15126m | 23% | 14% | -58° |
| 22:00 | ✓ | 24% | 15960m | 7% | 14% | -61° |
| 23:00 | ✓ | 19% | 18685m | 4.7% | 14% | -60° |
| Mon, Mar 16 | ||||||
| 24:00 | ✓ | 13% | 21410m | 2.3% | 14% | -54° |
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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