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
Tue, Mar 17 · 03:00–05:01 · 2h window
Low confidence
38%
🌛Moon Altitude-30.5--10.1°
☁️Total Cloud Coverage5-14.4%
Pristine Dark Skies (pristine)
Chamonix
Wed, Mar 18 · 01:00–04:59
🌛Moon Altitude:-47.2--23.5°
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° |
|---|---|---|---|---|---|---|
| Thu, Mar 12 | ||||||
| 05:00 | ✓ | 100% | 40m | 39% | 39% | 9.8° |
| 06:00 | ✕ | 100% | 122m | 39% | 39% | 14° |
| 07:00 | ✕ | 100% | 1278m | 39% | 39% | 16° |
| 08:00 | ✕ | 85% | 2426m | 55% | 39% | 15° |
| 09:00 | ✕ | 56% | 10248m | 27% | 39% | 12° |
| 10:00 | ✕ | 48% | 22827m | 0% | 39% | 7.8° |
| 11:00 | ✕ | 39% | 24134m | 0% | 39% | 1.4° |
| 12:00 | ✕ | 5% | 24134m | 0% | 39% | -6.4° |
| 13:00 | ✕ | 5% | 24135m | 0% | 39% | -15° |
| 14:00 | ✕ | 73% | 3931m | 0% | 39% | -24° |
| 15:00 | ✕ | 80% | 4024m | 0% | 39% | -34° |
| 16:00 | ✕ | 82% | 4607m | 0% | 39% | -44° |
| 17:00 | ✕ | 75% | 16247m | 0% | 39% | -54° |
| 18:00 | ✕ | 37% | 24135m | 0% | 39% | -63° |
| 19:00 | ✕ | 8.3% | 24134m | 0% | 39% | -70° |
| 20:00 | ✓ | 2.3% | 24134m | 0% | 39% | -72° |
| 21:00 | ✓ | 5% | 24135m | 0% | 39% | -67° |
| 22:00 | ✓ | 4.4% | 24135m | 0% | 39% | -58° |
| 23:00 | ✓ | 1.2% | 24134m | 0% | 39% | -49° |
| Fri, Mar 13 | ||||||
| 24:00 | ✓ | 0.7% | 24135m | 0% | 39% | -39° |
| 01:00 | ✓ | 5% | 24135m | 0% | 30% | -29° |
| 02:00 | ✓ | 5% | 24135m | 0% | 30% | -19° |
| 03:00 | ✓ | 5% | 24135m | 0% | 30% | -9.7° |
| 04:00 | ✓ | 4.9% | 24134m | 0% | 30% | -1.4° |
| 05:00 | ✓ | 4.4% | 24135m | 0% | 30% | 5.8° |
| 06:00 | ✕ | 5% | 24135m | 0% | 30% | 12° |
| 07:00 | ✕ | 27% | 24134m | 0% | 30% | 15° |
| 08:00 | ✕ | 8% | 24135m | 0% | 30% | 17° |
| 09:00 | ✕ | 55% | 24134m | 0% | 30% | 16° |
| 10:00 | ✕ | 11% | 24134m | 0% | 30% | 13° |
| 11:00 | ✕ | 5% | 13696m | 0% | 30% | 8.2° |
| 12:00 | ✕ | 80% | 13128m | 0% | 30% | 1.6° |
| 13:00 | ✕ | 100% | 16131m | 0% | 30% | -6.3° |
| 14:00 | ✕ | 100% | 24134m | 0% | 30% | -15° |
| 15:00 | ✕ | 100% | 24135m | 0% | 30% | -25° |
| 16:00 | ✕ | 100% | 24134m | 0% | 30% | -35° |
| 17:00 | ✕ | 100% | 24134m | 0% | 30% | -45° |
| 18:00 | ✕ | 100% | 24135m | 0% | 30% | -54° |
| 19:00 | ✕ | 100% | 24135m | 0% | 30% | -63° |
| 20:00 | ✓ | 100% | 24135m | 13% | 30% | -69° |
| 21:00 | ✓ | 100% | 24135m | 26% | 30% | -69° |
| 22:00 | ✓ | 100% | 24134m | 39% | 30% | -64° |
| 23:00 | ✓ | 100% | 24134m | 48% | 30% | -56° |
| Sat, Mar 14 | ||||||
| 24:00 | ✓ | 100% | 24134m | 57% | 30% | -46° |
| 01:00 | ✓ | 99% | 24135m | 66% | 22% | -36° |
| 02:00 | ✓ | 100% | 24135m | 78% | 22% | -26° |
| 03:00 | ✓ | 100% | 24135m | 89% | 22% | -16° |
| 04:00 | ✓ | 100% | 24135m | 100% | 22% | -6.7° |
| 05:00 | ✓ | 100% | 24134m | 100% | 22% | 1.7° |
| 06:00 | ✕ | 100% | 24134m | 100% | 22% | 9° |
| 07:00 | ✕ | 100% | 17808m | 100% | 22% | 15° |
| 08:00 | ✕ | 100% | 77m | 100% | 22% | 18° |
| 09:00 | ✕ | 100% | 58m | 100% | 22% | 20° |
| 10:00 | ✕ | 100% | 45m | 100% | 22% | 19° |
| 11:00 | ✕ | 100% | 39m | 100% | 22% | 15° |
| 12:00 | ✕ | 100% | 43m | 100% | 22% | 9.8° |
| 13:00 | ✕ | 100% | 54m | 100% | 22% | 2.8° |
| 14:00 | ✕ | 100% | 70m | 100% | 22% | -5.5° |
| 15:00 | ✕ | 100% | 92m | 100% | 22% | -15° |
| 16:00 | ✕ | 100% | 104m | 100% | 22% | -24° |
| 17:00 | ✕ | 100% | 90m | 100% | 22% | -34° |
| 18:00 | ✕ | 100% | 82m | 100% | 22% | -44° |
| 19:00 | ✕ | 100% | 100m | 100% | 22% | -53° |
| 20:00 | ✓ | 100% | 118m | 100% | 22% | -61° |
| 21:00 | ✓ | 100% | 107m | 100% | 22% | -66° |
| 22:00 | ✓ | 100% | 93m | 100% | 22% | -66° |
| 23:00 | ✓ | 100% | 98m | 100% | 22% | -60° |
| Sun, Mar 15 | ||||||
| 24:00 | ✓ | 100% | 136m | 99% | 22% | -52° |
| 01:00 | ✓ | 100% | 278m | 99% | 14% | -42° |
| 02:00 | ✓ | 100% | 997m | 86% | 14% | -32° |
| 03:00 | ✓ | 100% | 3448m | 73% | 14% | -22° |
| 04:00 | ✓ | 100% | 2823m | 60% | 14% | -12° |
| 05:00 | ✓ | 100% | 3323m | 65% | 14% | -2.4° |
| 06:00 | ✕ | 100% | 3671m | 71% | 14% | 6.1° |
| 07:00 | ✕ | 100% | 11195m | 76% | 14% | 13° |
| 08:00 | ✕ | 98% | 7658m | 78% | 14% | 19° |
| 09:00 | ✕ | 95% | 4121m | 80% | 14% | 23° |
| 10:00 | ✕ | 93% | 584m | 82% | 14% | 24° |
| 11:00 | ✕ | 95% | 466m | 82% | 14% | 22° |
| 12:00 | ✕ | 98% | 349m | 82% | 14% | 18° |
| 13:00 | ✕ | 100% | 231m | 82% | 14% | 12° |
| 14:00 | ✕ | 96% | 1021m | 68% | 14% | 4.7° |
| 15:00 | ✕ | 92% | 1811m | 53% | 14% | -4° |
| 16:00 | ✕ | 87% | 2602m | 39% | 14% | -13° |
| 17:00 | ✕ | 92% | 7352m | 45% | 14% | -23° |
| 18:00 | ✕ | 96% | 12103m | 50% | 14% | -33° |
| 19:00 | ✕ | 100% | 16854m | 56% | 14% | -43° |
| 20:00 | ✓ | 78% | 16997m | 38% | 14% | -52° |
| 21:00 | ✓ | 56% | 17141m | 21% | 14% | -59° |
| 22:00 | ✓ | 35% | 17284m | 3.5% | 14% | -62° |
| 23:00 | ✓ | 32% | 17470m | 2.3% | 14% | -61° |
| Mon, Mar 16 | ||||||
| 24:00 | ✓ | 30% | 17656m | 1.2% | 14% | -55° |
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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