condition mean min max 4 h after light 6.51722 5.4272 7.60724 8 h after light 3.42762 2.99582 3.85942 12 h after light 3.255015 3.08402 3.42601 4 h after dark 1.4750666666666667 0.0 3.04667 8 h after dark 9.503743333333333 7.00926 12.0881 12 h after dark 8.41104 5.62939 12.2983