Rule
Dark Skies
Chamonix - Dark Skies - Alps
Chamonix, Auvergne-Rhône-Alpes, France
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)
Chamonix
Tomorrow · 23:14–03:43 · 4h window
Medium confidence
56%
🌛Moon Altitude-19.2--12.4°
☁️Total Cloud Coverage3.3-5.7%
Pristine Dark Skies (pristine)
Chamonix
Thu, May 21 · 23:24–03:33
🌛Moon Altitude:-8.8-29.3°
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° |
|---|---|---|---|---|---|---|
| Fri, May 15 | ||||||
| 06:00 | ✕ | 100% | 201m | 100% | 2.9% | 13° |
| 07:00 | ✕ | 100% | 127m | 100% | 2.9% | 23° |
| 08:00 | ✕ | 100% | 92m | 100% | 2.9% | 33° |
| 09:00 | ✕ | 100% | 65m | 99% | 2.9% | 43° |
| 10:00 | ✕ | 100% | 79m | 99% | 2.9% | 52° |
| 11:00 | ✕ | 100% | 27m | 99% | 2.9% | 58° |
| 12:00 | ✕ | 100% | 22m | 99% | 2.9% | 61° |
| 13:00 | ✕ | 100% | 22m | 100% | 2.9% | 59° |
| 14:00 | ✕ | 100% | 21m | 100% | 2.9% | 53° |
| 15:00 | ✕ | 100% | 23m | 96% | 2.9% | 45° |
| 16:00 | ✕ | 100% | 431m | 84% | 2.9% | 36° |
| 17:00 | ✕ | 100% | 584m | 75% | 2.9% | 26° |
| 18:00 | ✕ | 100% | 2412m | 80% | 2.9% | 16° |
| 19:00 | ✕ | 100% | 2487m | 85% | 2.9% | 6.5° |
| 20:00 | ✕ | 99% | 2830m | 90% | 2.9% | -2.4° |
| 21:00 | ✕ | 100% | 4439m | 91% | 2.9% | -10° |
| 22:00 | ✕ | 100% | 3005m | 91% | 2.9% | -17° |
| 23:00 | ✓ | 100% | 1175m | 92% | 2.9% | -21° |
| Sat, May 16 | ||||||
| 24:00 | ✓ | 99% | 420m | 93% | 2.9% | -24° |
| 01:00 | ✓ | 99% | 274m | 95% | 2.9% | -24° |
| 02:00 | ✓ | 94% | 388m | 96% | 0.2% | -21° |
| 03:00 | ✓ | 96% | 1263m | 92% | 0.2% | -16° |
| 04:00 | ✕ | 99% | 3362m | 87% | 0.2% | -9.5° |
| 05:00 | ✕ | 98% | 6045m | 82% | 0.2% | -1.4° |
| 06:00 | ✕ | 92% | 8898m | 88% | 0.2% | 7.7° |
| 07:00 | ✕ | 91% | 15357m | 94% | 0.2% | 17° |
| 08:00 | ✕ | 32% | 24135m | 100% | 0.2% | 27° |
| 09:00 | ✕ | 22% | 24135m | 100% | 0.2% | 37° |
| 10:00 | ✕ | 68% | 13581m | 100% | 0.2% | 47° |
| 11:00 | ✕ | 71% | 3453m | 100% | 0.2% | 56° |
| 12:00 | ✕ | 74% | 2810m | 100% | 0.2% | 63° |
| 13:00 | ✕ | 71% | 4916m | 100% | 0.2% | 67° |
| 14:00 | ✕ | 63% | 5400m | 100% | 0.2% | 64° |
| 15:00 | ✕ | 68% | 2610m | 76% | 0.2% | 57° |
| 16:00 | ✕ | 99% | 2133m | 52% | 0.2% | 49° |
| 17:00 | ✕ | 99% | 7872m | 28% | 0.2% | 39° |
| 18:00 | ✕ | 89% | 6260m | 32% | 0.2% | 29° |
| 19:00 | ✕ | 88% | 7854m | 35% | 0.2% | 19° |
| 20:00 | ✕ | 62% | 14277m | 39% | 0.2% | 10° |
| 21:00 | ✕ | 29% | 24134m | 26% | 0.2% | 1.4° |
| 22:00 | ✕ | 5.8% | 24134m | 13% | 0.2% | -6.2° |
| 23:00 | ✓ | 5.7% | 24134m | 0% | 0.2% | -12° |
| Sun, May 17 | ||||||
| 24:00 | ✓ | 3.3% | 24134m | 0% | 0.2% | -17° |
| 01:00 | ✓ | 3.4% | 24135m | 0% | 0.2% | -19° |
| 02:00 | ✓ | 3.9% | 24135m | 0% | 0.5% | -19° |
| 03:00 | ✓ | 3.9% | 24135m | 0% | 0.5% | -17° |
| 04:00 | ✕ | 3.9% | 24135m | 0% | 0.5% | -12° |
| 05:00 | ✕ | 3.9% | 24134m | 0% | 0.5% | -5.9° |
| 06:00 | ✕ | 5% | 24134m | 0% | 0.5% | 1.8° |
| 07:00 | ✕ | 5% | 24135m | 0% | 0.5% | 10° |
| 08:00 | ✕ | 49% | 24135m | 0% | 0.5% | 20° |
| 09:00 | ✕ | 100% | 24134m | 19% | 0.5% | 30° |
| 10:00 | ✕ | 100% | 24135m | 37% | 0.5% | 40° |
| 11:00 | ✕ | 100% | 24135m | 56% | 0.5% | 50° |
| 12:00 | ✕ | 100% | 24134m | 65% | 0.5% | 59° |
| 13:00 | ✕ | 100% | 24134m | 74% | 0.5% | 67° |
| 14:00 | ✕ | 74% | 24134m | 83% | 0.5% | 70° |
| 15:00 | ✕ | 19% | 24134m | 72% | 0.5% | 68° |
| 16:00 | ✕ | 48% | 24135m | 61% | 0.5% | 61° |
| 17:00 | ✕ | 62% | 24134m | 50% | 0.5% | 52° |
| 18:00 | ✕ | 79% | 19905m | 39% | 0.5% | 42° |
| 19:00 | ✕ | 77% | 24134m | 28% | 0.5% | 32° |
| 20:00 | ✕ | 62% | 24134m | 17% | 0.5% | 22° |
| 21:00 | ✕ | 82% | 24135m | 19% | 0.5% | 13° |
| 22:00 | ✕ | 49% | 24134m | 20% | 0.5% | 4.5° |
| 23:00 | ✓ | 62% | 24135m | 22% | 0.5% | -3° |
| Mon, May 18 | ||||||
| 24:00 | ✓ | 36% | 24135m | 32% | 0.5% | -9.2° |
| 01:00 | ✓ | 55% | 24134m | 42% | 0.5% | -14° |
| 02:00 | ✓ | 100% | 24135m | 52% | 3.8% | -16° |
| 03:00 | ✓ | 100% | 17197m | 57% | 3.8% | -16° |
| 04:00 | ✕ | 100% | 10259m | 62% | 3.8% | -14° |
| 05:00 | ✕ | 100% | 3321m | 66% | 3.8% | -10° |
| 06:00 | ✕ | 100% | 2680m | 75% | 3.8% | -4.4° |
| 07:00 | ✕ | 100% | 2039m | 84% | 3.8% | 2.9° |
| 08:00 | ✕ | 100% | 1398m | 92% | 3.8% | 11° |
| 09:00 | ✕ | 100% | 2161m | 93% | 3.8% | 20° |
| 10:00 | ✕ | 100% | 2925m | 95% | 3.8% | 30° |
| 11:00 | ✕ | 100% | 3688m | 96% | 3.8% | 40° |
| 12:00 | ✕ | 94% | 10073m | 94% | 3.8% | 50° |
| 13:00 | ✕ | 87% | 16458m | 93% | 3.8% | 59° |
| 14:00 | ✕ | 81% | 22843m | 91% | 3.8% | 68° |
| 15:00 | ✕ | 87% | 19966m | 75% | 3.8% | 72° |
| 16:00 | ✕ | 94% | 17089m | 59% | 3.8% | 70° |
| 17:00 | ✕ | 100% | 14212m | 43% | 3.8% | 63° |
| 18:00 | ✕ | 100% | 16690m | 46% | 3.8% | 54° |
| 19:00 | ✕ | 100% | 19168m | 49% | 3.8% | 44° |
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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