condition mean min max 4 h after light 2.6 2.6 2.6 8 h after light 12.75 6.2 19.3 12 h after light 2.95 2.8 3.1 4 h after dark 3.05 2.6 3.5 8 h after dark 7.5 2.3 12.7 12 h after dark 6.6 5.1 8.1