Rule
Dark Skies
Saas-Fee - Dark Skies - Alps
Saas-Fee, Valais, 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)
Saas-Fee
Today · 23:54–02:59 · 3h window
Medium confidence
50%
🌛Moon Altitude-24.3-5.8°
☁️Total Cloud Coverage0.2-5%
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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 | ✕ | 69% | 21336m | 26% | 78% | 19° |
| 08:00 | ✕ | 17% | 20344m | 39% | 78% | 14° |
| 09:00 | ✕ | 11% | 20293m | 49% | 78% | 7.2° |
| 10:00 | ✕ | 13% | 20378m | 66% | 78% | -1° |
| 11:00 | ✕ | 14% | 20328m | 82% | 78% | -10° |
| 12:00 | ✕ | 59% | 11013m | 86% | 78% | -20° |
| 13:00 | ✕ | 80% | 7826m | 90% | 78% | -30° |
| 14:00 | ✕ | 90% | 7790m | 95% | 78% | -40° |
| 15:00 | ✕ | 98% | 8746m | 78% | 78% | -49° |
| 16:00 | ✕ | 97% | 150m | 57% | 78% | -57° |
| 17:00 | ✕ | 100% | 183m | 37% | 78% | -62° |
| 18:00 | ✕ | 100% | 293m | 45% | 78% | -62° |
| 19:00 | ✕ | 94% | 260m | 53% | 78% | -57° |
| 20:00 | ✕ | 85% | 2097m | 61% | 78% | -50° |
| 21:00 | ✕ | 90% | 227m | 61% | 78% | -41° |
| 22:00 | ✕ | 95% | 202m | 39% | 78% | -31° |
| 23:00 | ✓ | 97% | 319m | 18% | 78% | -20° |
| Sat, Jun 6 | ||||||
| 24:00 | ✓ | 88% | 606m | 29% | 78% | -10° |
| 01:00 | ✓ | 91% | 879m | 41% | 78% | -0.66° |
| 02:00 | ✓ | 76% | 20478m | 52% | 69% | 8.2° |
| 03:00 | ✓ | 100% | 20439m | 88% | 69% | 16° |
| 04:00 | ✕ | 100% | 5353m | 94% | 69% | 22° |
| 05:00 | ✕ | 100% | 20725m | 100% | 69% | 26° |
| 06:00 | ✕ | 100% | 21674m | 100% | 69% | 28° |
| 07:00 | ✕ | 100% | 24135m | 100% | 69% | 26° |
| 08:00 | ✕ | 79% | 24134m | 100% | 69% | 23° |
| 09:00 | ✕ | 92% | 24135m | 100% | 69% | 17° |
| 10:00 | ✕ | 83% | 9910m | 100% | 69% | 9.1° |
| 11:00 | ✕ | 99% | 4623m | 100% | 69% | 0.33° |
| 12:00 | ✕ | 87% | 7335m | 100% | 69% | -9.1° |
| 13:00 | ✕ | 90% | 9253m | 100% | 69% | -19° |
| 14:00 | ✕ | 73% | 9818m | 100% | 69% | -29° |
| 15:00 | ✕ | 83% | 4149m | 67% | 69% | -38° |
| 16:00 | ✕ | 72% | 10575m | 33% | 69% | -47° |
| 17:00 | ✕ | 34% | 17677m | 0% | 69% | -54° |
| 18:00 | ✕ | 73% | 23859m | 0% | 69% | -57° |
| 19:00 | ✕ | 21% | 24134m | 0% | 69% | -56° |
| 20:00 | ✕ | 9.6% | 24134m | 0% | 69% | -51° |
| 21:00 | ✕ | 3.3% | 23371m | 0% | 69% | -44° |
| 22:00 | ✕ | 0.8% | 24135m | 0% | 69% | -34° |
| 23:00 | ✓ | 0.7% | 24135m | 0% | 69% | -24° |
| Sun, Jun 7 | ||||||
| 24:00 | ✓ | 0.5% | 24135m | 0% | 69% | -14° |
| 01:00 | ✓ | 0.2% | 24134m | 0% | 69% | -4° |
| 02:00 | ✓ | 5% | 24135m | 0% | 59% | 5.8° |
| 03:00 | ✕ | 5% | 24134m | 0% | 59% | 15° |
| 04:00 | ✕ | 5% | 24135m | 0% | 59% | 22° |
| 05:00 | ✕ | 5% | 24135m | 0% | 59% | 29° |
| 06:00 | ✕ | 5% | 24134m | 19% | 59% | 32° |
| 07:00 | ✕ | 5% | 24135m | 37% | 59% | 33° |
| 08:00 | ✕ | 6.6% | 24134m | 56% | 59% | 31° |
| 09:00 | ✕ | 8.3% | 24134m | 71% | 59% | 26° |
| 10:00 | ✕ | 79% | 24134m | 85% | 59% | 19° |
| 11:00 | ✕ | 51% | 24135m | 100% | 59% | 11° |
| 12:00 | ✕ | 95% | 24134m | 100% | 59% | 1.9° |
| 13:00 | ✕ | 100% | 8151m | 100% | 59% | -7.9° |
| 14:00 | ✕ | 100% | 6907m | 100% | 59% | -18° |
| 15:00 | ✕ | 100% | 6779m | 98% | 59% | -28° |
| 16:00 | ✕ | 97% | 6247m | 95% | 59% | -37° |
| 17:00 | ✕ | 81% | 11016m | 93% | 59% | -44° |
| 18:00 | ✕ | 93% | 7866m | 92% | 59% | -50° |
| 19:00 | ✕ | 100% | 11948m | 92% | 59% | -52° |
| 20:00 | ✕ | 100% | 19802m | 92% | 59% | -50° |
| 21:00 | ✕ | 100% | 20245m | 74% | 59% | -44° |
| 22:00 | ✕ | 100% | 20300m | 57% | 59% | -37° |
| 23:00 | ✓ | 14% | 24134m | 39% | 59% | -27° |
| Mon, Jun 8 | ||||||
| 24:00 | ✓ | 3.9% | 24134m | 39% | 59% | -17° |
| 01:00 | ✓ | 5% | 24135m | 39% | 59% | -7.1° |
| 02:00 | ✓ | 1.3% | 24134m | 39% | 50% | 3.1° |
| 03:00 | ✕ | 5% | 24134m | 47% | 50% | 13° |
| 04:00 | ✕ | 5% | 24134m | 56% | 50% | 22° |
| 05:00 | ✕ | 5% | 24134m | 64% | 50% | 30° |
| 06:00 | ✕ | 5% | 24135m | 74% | 50% | 35° |
| 07:00 | ✕ | 5% | 24135m | 84% | 50% | 39° |
| 08:00 | ✕ | 5.1% | 24135m | 94% | 50% | 39° |
| 09:00 | ✕ | 30% | 18469m | 96% | 50% | 35° |
| 10:00 | ✕ | 56% | 12803m | 98% | 50% | 30° |
| 11:00 | ✕ | 81% | 7137m | 100% | 50% | 22° |
| 12:00 | ✕ | 87% | 7106m | 100% | 50% | 13° |
| 13:00 | ✕ | 94% | 7075m | 100% | 50% | 3.6° |
| 14:00 | ✕ | 100% | 7044m | 100% | 50% | -6.3° |
| 15:00 | ✕ | 100% | 11543m | 95% | 50% | -16° |
| 16:00 | ✕ | 100% | 16041m | 89% | 50% | -25° |
| 17:00 | ✕ | 100% | 20540m | 84% | 50% | -34° |
| 18:00 | ✕ | 100% | 21738m | 80% | 50% | -41° |
| 19:00 | ✕ | 100% | 22937m | 75% | 50% | -45° |
| 20:00 | ✕ | 100% | 24135m | 71% | 50% | -45° |
| 21:00 | ✕ | 100% | 24135m | 55% | 50% | -43° |
| 22:00 | ✕ | 100% | 24135m | 38% | 50% | -37° |
| 23:00 | ✓ | 100% | 24135m | 22% | 50% | -29° |
| Tue, Jun 9 | ||||||
| 24:00 | ✓ | 100% | 24135m | 36% | 50% | -20° |
| 01:00 | ✓ | 100% | 24135m | 50% | 50% | -10° |
| 02:00 | ✓ | 100% | 24135m | 64% | 38% | 0.21° |
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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