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Score 0–10 summarising the entire night for the selected observing profile.
| 25% | Median score | typical per-hour observing quality |
| 25% | Clear sky | fraction of night with clouds < 60% |
| 20% | Best window | peak 4-hour continuous block |
| 15% | Reliability | avoids prolonged bad spells (< 30 pts) |
| 15% | Stability | consistent conditions, low variance |