condition mean min max 4 h after light 636.7 636.7 636.7 8 h after light 618.0 609.7 626.3 12 h after light 659.5 615.9 703.1 4 h after dark 684.8 565.4 804.2 8 h after dark 751.7 725.9 777.5 12 h after dark 669.95 634.7 705.2