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
Pristine Dark Skies (pristine)
Grindelwald
Mon, Jun 15 · 02:00–02:43 · 1h window
High confidence
72%
🌛Moon Altitude-14.9°
☁️Total Cloud Coverage0%
Good Dark Skies
Grindelwald
Wed, Jun 17 · 24:14–01:00
🌛Moon Altitude:-5.1°
Medium
Pristine Dark Skies (pristine)
Grindelwald
Thu, Jun 18 · 24:15–02:42
🌛Moon Altitude:-15.4--0.8°
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° |
|---|---|---|---|---|---|---|
| Fri, Jun 12 | ||||||
| 21:00 | ✕ | 67% | 16951m | 0% | 10% | -16° |
| 22:00 | ✕ | 44% | 13806m | 0% | 10% | -20° |
| 23:00 | ✕ | 45% | 13809m | 0% | 10% | -21° |
| Sat, Jun 13 | ||||||
| 24:00 | ✓ | 69% | 13885m | 0% | 10% | -20° |
| 01:00 | ✓ | 66% | 24135m | 0% | 10% | -16° |
| 02:00 | ✓ | 42% | 24134m | 0% | 4.5% | -11° |
| 03:00 | ✕ | 5% | 24134m | 0% | 4.5% | -4° |
| 04:00 | ✕ | 12% | 24134m | 0% | 4.5% | 4.3° |
| 05:00 | ✕ | 11% | 24135m | 0% | 4.5% | 13° |
| 06:00 | ✕ | 5.6% | 24135m | 0% | 4.5% | 23° |
| 07:00 | ✕ | 5% | 24135m | 0% | 4.5% | 33° |
| 08:00 | ✕ | 5% | 24134m | 0% | 4.5% | 43° |
| 09:00 | ✕ | 11% | 14123m | 0% | 4.5% | 52° |
| 10:00 | ✕ | 21% | 13793m | 0% | 4.5% | 61° |
| 11:00 | ✕ | 20% | 13792m | 0% | 4.5% | 67° |
| 12:00 | ✕ | 22% | 13792m | 0% | 4.5% | 68° |
| 13:00 | ✕ | 23% | 13792m | 0% | 4.5% | 63° |
| 14:00 | ✕ | 23% | 13792m | 0% | 4.5% | 55° |
| 15:00 | ✕ | 23% | 13792m | 0% | 4.5% | 46° |
| 16:00 | ✕ | 29% | 13792m | 0% | 4.5% | 36° |
| 17:00 | ✕ | 47% | 13792m | 0% | 4.5% | 27° |
| 18:00 | ✕ | 89% | 13793m | 0% | 4.5% | 17° |
| 19:00 | ✕ | 100% | 13793m | 0% | 4.5% | 8.4° |
| 20:00 | ✕ | 98% | 13794m | 0% | 4.5% | 0.27° |
| 21:00 | ✕ | 99% | 13800m | 0% | 4.5% | -6.7° |
| 22:00 | ✕ | 92% | 13815m | 0% | 4.5% | -12° |
| 23:00 | ✕ | 43% | 13841m | 0% | 4.5% | -16° |
| Sun, Jun 14 | ||||||
| 24:00 | ✓ | 85% | 13944m | 0% | 4.5% | -17° |
| 01:00 | ✓ | 99% | 24134m | 0% | 4.5% | -16° |
| 02:00 | ✓ | 62% | 24134m | 0% | 0.7% | -13° |
| 03:00 | ✕ | 82% | 24134m | 0% | 0.7% | -8.2° |
| 04:00 | ✕ | 89% | 24134m | 0% | 0.7% | -1.6° |
| 05:00 | ✕ | 95% | 24134m | 0% | 0.7% | 6.3° |
| 06:00 | ✕ | 62% | 24135m | 0% | 0.7% | 15° |
| 07:00 | ✕ | 52% | 24135m | 0% | 0.7% | 24° |
| 08:00 | ✕ | 49% | 24134m | 0% | 0.7% | 34° |
| 09:00 | ✕ | 41% | 24135m | 0% | 0.7% | 44° |
| 10:00 | ✕ | 42% | 13992m | 0% | 0.7% | 54° |
| 11:00 | ✕ | 34% | 13808m | 0% | 0.7% | 63° |
| 12:00 | ✕ | 38% | 13792m | 13% | 0.7% | 69° |
| 13:00 | ✕ | 48% | 13792m | 26% | 0.7% | 70° |
| 14:00 | ✕ | 77% | 13792m | 39% | 0.7% | 66° |
| 15:00 | ✕ | 45% | 13792m | 26% | 0.7% | 58° |
| 16:00 | ✕ | 41% | 13792m | 13% | 0.7% | 49° |
| 17:00 | ✕ | 92% | 13794m | 0% | 0.7% | 39° |
| 18:00 | ✕ | 54% | 13794m | 0% | 0.7% | 29° |
| 19:00 | ✕ | 32% | 13795m | 0% | 0.7% | 20° |
| 20:00 | ✕ | 23% | 13795m | 0% | 0.7% | 11° |
| 21:00 | ✕ | 25% | 13799m | 0% | 0.7% | 2.8° |
| 22:00 | ✕ | 25% | 13805m | 0% | 0.7% | -4.2° |
| 23:00 | ✕ | 24% | 13805m | 0% | 0.7% | -9.8° |
| Mon, Jun 15 | ||||||
| 24:00 | ✓ | 23% | 13812m | 0% | 0.7% | -14° |
| 01:00 | ✓ | 22% | 13870m | 0% | 0.7% | -15° |
| 02:00 | ✓ | 0% | 24135m | 0% | 0.1% | -15° |
| 03:00 | ✕ | 0% | 24134m | 0% | 0.1% | -12° |
| 04:00 | ✕ | 0% | 24134m | 0% | 0.1% | -7.6° |
| 05:00 | ✕ | 0% | 24134m | 0% | 0.1% | -1.3° |
| 06:00 | ✕ | 0% | 24134m | 0% | 0.1% | 6.2° |
| 07:00 | ✕ | 2% | 24135m | 0% | 0.1% | 15° |
| 08:00 | ✕ | 3.9% | 24134m | 0% | 0.1% | 24° |
| 09:00 | ✕ | 21% | 13836m | 7.4% | 0.1% | 34° |
| 10:00 | ✕ | 21% | 13793m | 15% | 0.1% | 43° |
| 11:00 | ✕ | 23% | 13793m | 22% | 0.1% | 53° |
| 12:00 | ✕ | 23% | 13806m | 31% | 0.1% | 62° |
| 13:00 | ✕ | 37% | 13805m | 40% | 0.1% | 69° |
| 14:00 | ✕ | 44% | 13805m | 49% | 0.1% | 71° |
| 15:00 | ✕ | 42% | 8700m | 34% | 0.1% | 67° |
| 16:00 | ✕ | 33% | 6467m | 20% | 0.1% | 60° |
| 17:00 | ✕ | 26% | 8052m | 4.9% | 0.1% | 50° |
| 18:00 | ✕ | 36% | 8078m | 3.3% | 0.1% | 40° |
| 19:00 | ✕ | 39% | 13816m | 1.6% | 0.1% | 31° |
| 20:00 | ✕ | 29% | 13829m | 0% | 0.1% | 21° |
| 21:00 | ✕ | 23% | 13829m | 0% | 0.1% | 12° |
| 22:00 | ✕ | 23% | 13831m | 0% | 0.1% | 3.7° |
| 23:00 | ✕ | 23% | 13816m | 0% | 0.1% | -3.6° |
| Tue, Jun 16 | ||||||
| 24:00 | ✓ | 23% | 13827m | 0% | 0.1% | -9.5° |
| 01:00 | ✓ | 45% | 15148m | 0% | 0.1% | -14° |
| 02:00 | ✓ | 31% | 24134m | 0% | 2.6% | -16° |
| 03:00 | ✕ | 54% | 20687m | 0% | 2.6% | -16° |
| 04:00 | ✕ | 77% | 17240m | 0% | 2.6% | -13° |
| 05:00 | ✕ | 100% | 13793m | 0% | 2.6% | -9° |
| 06:00 | ✕ | 82% | 13793m | 17% | 2.6% | -3° |
| 07:00 | ✕ | 65% | 13793m | 33% | 2.6% | 4.4° |
| 08:00 | ✕ | 48% | 13793m | 50% | 2.6% | 13° |
| 09:00 | ✕ | 46% | 13793m | 43% | 2.6% | 22° |
| 10:00 | ✕ | 43% | 13793m | 37% | 2.6% | 32° |
| 11:00 | ✕ | 41% | 13793m | 30% | 2.6% | 41° |
| 12:00 | ✕ | 54% | 13794m | 29% | 2.6% | 51° |
| 13:00 | ✕ | 66% | 13794m | 29% | 2.6% | 60° |
| 14:00 | ✕ | 79% | 13794m | 28% | 2.6% | 67° |
| 15:00 | ✕ | 58% | 17241m | 26% | 2.6% | 70° |
| 16:00 | ✕ | 36% | 20688m | 24% | 2.6% | 66° |
| 17:00 | ✕ | 15% | 24135m | 22% | 2.6% | 59° |
| 18:00 | ✕ | 42% | 24135m | 22% | 2.6% | 50° |
| 19:00 | ✕ | 70% | 24135m | 22% | 2.6% | 40° |
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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