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
Tomorrow · 24:01–02:51 · 3h window
Medium confidence
48%
🌛Moon Altitude-14-5.6°
☁️Total Cloud Coverage0-0.2%
Pristine Dark Skies (pristine)
Grindelwald
Mon, Jun 8 · 24:03–02:50
🌛Moon Altitude:-17.2-3°
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 5 | ||||||
| 07:00 | ✕ | 95% | 646m | 99% | 78% | 19° |
| 08:00 | ✕ | 85% | 910m | 100% | 78% | 14° |
| 09:00 | ✕ | 63% | 676m | 99% | 78% | 6.8° |
| 10:00 | ✕ | 66% | 8090m | 99% | 78% | -1.3° |
| 11:00 | ✕ | 70% | 18779m | 98% | 78% | -10° |
| 12:00 | ✕ | 79% | 15699m | 99% | 78% | -20° |
| 13:00 | ✕ | 78% | 18935m | 99% | 78% | -30° |
| 14:00 | ✕ | 72% | 15895m | 100% | 78% | -40° |
| 15:00 | ✕ | 62% | 13817m | 68% | 78% | -49° |
| 16:00 | ✕ | 69% | 259m | 39% | 78% | -56° |
| 17:00 | ✕ | 76% | 273m | 8.3% | 78% | -61° |
| 18:00 | ✕ | 87% | 381m | 11% | 78% | -61° |
| 19:00 | ✕ | 63% | 869m | 14% | 78% | -57° |
| 20:00 | ✕ | 62% | 9757m | 17% | 78% | -50° |
| 21:00 | ✕ | 77% | 388m | 0.3% | 78% | -40° |
| 22:00 | ✕ | 60% | 11147m | 0.61% | 78% | -30° |
| 23:00 | ✓ | 62% | 24135m | 0.91% | 78% | -20° |
| Sat, Jun 6 | ||||||
| 24:00 | ✓ | 47% | 536m | 0.61% | 78% | -10° |
| 01:00 | ✓ | 43% | 373m | 0.3% | 78% | -0.81° |
| 02:00 | ✓ | 93% | 568m | 0% | 69% | 8° |
| 03:00 | ✕ | 100% | 1071m | 8.7% | 69% | 16° |
| 04:00 | ✕ | 100% | 966m | 17% | 69% | 22° |
| 05:00 | ✕ | 100% | 1073m | 26% | 69% | 26° |
| 06:00 | ✕ | 100% | 2657m | 50% | 69% | 27° |
| 07:00 | ✕ | 100% | 1287m | 74% | 69% | 26° |
| 08:00 | ✕ | 99% | 314m | 98% | 69% | 22° |
| 09:00 | ✕ | 100% | 74m | 99% | 69% | 16° |
| 10:00 | ✕ | 98% | 122m | 99% | 69% | 8.7° |
| 11:00 | ✕ | 99% | 644m | 100% | 69% | 0.06° |
| 12:00 | ✕ | 79% | 12747m | 100% | 69% | -9.3° |
| 13:00 | ✕ | 62% | 11272m | 100% | 69% | -19° |
| 14:00 | ✕ | 51% | 13793m | 100% | 69% | -29° |
| 15:00 | ✕ | 57% | 7690m | 67% | 69% | -38° |
| 16:00 | ✕ | 58% | 6717m | 33% | 69% | -47° |
| 17:00 | ✕ | 63% | 1146m | 0% | 69% | -53° |
| 18:00 | ✕ | 47% | 12676m | 0% | 69% | -57° |
| 19:00 | ✕ | 56% | 13793m | 0% | 69% | -56° |
| 20:00 | ✕ | 57% | 13797m | 0% | 69% | -51° |
| 21:00 | ✕ | 46% | 13804m | 0% | 69% | -43° |
| 22:00 | ✕ | 20% | 13873m | 0% | 69% | -34° |
| 23:00 | ✕ | 0.9% | 24134m | 0% | 69% | -24° |
| Sun, Jun 7 | ||||||
| 24:00 | ✓ | 0% | 24134m | 0% | 69% | -14° |
| 01:00 | ✓ | 0% | 24134m | 0% | 69% | -4° |
| 02:00 | ✓ | 0.2% | 24134m | 0% | 59% | 5.6° |
| 03:00 | ✕ | 0% | 24134m | 0.3% | 59% | 14° |
| 04:00 | ✕ | 5% | 24135m | 0.61% | 59% | 22° |
| 05:00 | ✕ | 5% | 24135m | 0.91% | 59% | 28° |
| 06:00 | ✕ | 5% | 24134m | 14% | 59% | 32° |
| 07:00 | ✕ | 5% | 24135m | 26% | 59% | 33° |
| 08:00 | ✕ | 5% | 24134m | 39% | 59% | 30° |
| 09:00 | ✕ | 23% | 13834m | 59% | 59% | 26° |
| 10:00 | ✕ | 38% | 13793m | 79% | 59% | 19° |
| 11:00 | ✕ | 23% | 13798m | 100% | 59% | 11° |
| 12:00 | ✕ | 50% | 13865m | 100% | 59% | 1.7° |
| 13:00 | ✕ | 99% | 13872m | 100% | 59% | -8° |
| 14:00 | ✕ | 96% | 13842m | 100% | 59% | -18° |
| 15:00 | ✕ | 97% | 8398m | 83% | 59% | -27° |
| 16:00 | ✕ | 100% | 6645m | 66% | 59% | -36° |
| 17:00 | ✕ | 100% | 262m | 49% | 59% | -44° |
| 18:00 | ✕ | 99% | 9480m | 49% | 59% | -49° |
| 19:00 | ✕ | 98% | 9317m | 49% | 59% | -51° |
| 20:00 | ✕ | 100% | 13805m | 49% | 59% | -49° |
| 21:00 | ✕ | 96% | 13813m | 33% | 59% | -44° |
| 22:00 | ✕ | 40% | 13825m | 16% | 59% | -36° |
| 23:00 | ✕ | 8.8% | 24134m | 0% | 59% | -27° |
| Mon, Jun 8 | ||||||
| 24:00 | ✓ | 5% | 24134m | 0% | 59% | -17° |
| 01:00 | ✓ | 3.6% | 24135m | 0% | 59% | -7.1° |
| 02:00 | ✓ | 0.2% | 24134m | 0% | 50% | 3° |
| 03:00 | ✕ | 5% | 24134m | 0% | 50% | 13° |
| 04:00 | ✕ | 5% | 24134m | 0% | 50% | 22° |
| 05:00 | ✕ | 4% | 24134m | 0% | 50% | 29° |
| 06:00 | ✕ | 5% | 24135m | 19% | 50% | 35° |
| 07:00 | ✕ | 42% | 24135m | 37% | 50% | 38° |
| 08:00 | ✕ | 15% | 24135m | 56% | 50% | 38° |
| 09:00 | ✕ | 35% | 19913m | 68% | 50% | 35° |
| 10:00 | ✕ | 56% | 15691m | 80% | 50% | 29° |
| 11:00 | ✕ | 77% | 11469m | 92% | 50% | 22° |
| 12:00 | ✕ | 85% | 12240m | 94% | 50% | 13° |
| 13:00 | ✕ | 92% | 13010m | 97% | 50% | 3.4° |
| 14:00 | ✕ | 100% | 13780m | 99% | 50% | -6.3° |
| 15:00 | ✕ | 100% | 10736m | 94% | 50% | -16° |
| 16:00 | ✕ | 100% | 7691m | 88% | 50% | -25° |
| 17:00 | ✕ | 100% | 4646m | 83% | 50% | -34° |
| 18:00 | ✕ | 100% | 7750m | 87% | 50% | -40° |
| 19:00 | ✕ | 100% | 10855m | 90% | 50% | -44° |
| 20:00 | ✕ | 100% | 13959m | 94% | 50% | -45° |
| 21:00 | ✕ | 95% | 17351m | 85% | 50% | -42° |
| 22:00 | ✕ | 91% | 20743m | 76% | 50% | -37° |
| 23:00 | ✕ | 86% | 24135m | 67% | 50% | -29° |
| Tue, Jun 9 | ||||||
| 24:00 | ✓ | 91% | 24135m | 69% | 50% | -20° |
| 01:00 | ✓ | 95% | 24135m | 71% | 50% | -9.9° |
| 02:00 | ✓ | 100% | 24135m | 73% | 38% | 0.28° |
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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