condition mean min max 4 h after light 599.7 599.7 599.7 8 h after light 563.45 535.9 591.0 12 h after light 611.9 576.8 647.0 4 h after dark 847.1 740.0 954.2 8 h after dark 838.05 803.6 872.5 12 h after dark 795.9 756.5 835.3