condition mean min max 4 h after light 5.2 5.2 5.2 8 h after light 15.45 8.6 22.3 12 h after light 27.75 3.6 51.9 4 h after dark 41.05 35.5 46.6 8 h after dark 10.45 8.3 12.6 12 h after dark 12.4 5.3 19.5