condition mean min max 4 h after light 2.2 2.2 2.2 8 h after light 19.15 5.8 32.5 12 h after light 10.95 1.9 20.0 4 h after dark 8.1 3.8 12.4 8 h after dark 15.75 4.8 26.7 12 h after dark 7.7 5.6 9.8