condition mean min max 4 h after light 580.2 580.2 580.2 8 h after light 463.0 369.0 557.0 12 h after light 644.0 580.6 707.4 4 h after dark 529.75 443.6 615.9 8 h after dark 566.3 442.2 690.4 12 h after dark 687.3 672.3 702.3