| Urban population | ≥ 500,000 | < 500,000 | ≥ 500,000 | < 500,000 | No limit |
|---|---|---|---|---|---|
| Direct sunlight standard date | Major cold day (Dahan) (Jan 20) | Winter solstice (Dec 21) | |||
| Direct sunlight hours | ≥ 2 | ≥ 3 | ≥ 1 | ||
| Valid direct sunlight time period (Local solar time) | 8:00–16:00 | 9:00–15:00 | |||
| Point of calculation | Window sill of the lowest floor | ||||