condition mean min max 4 h after light 10.9 10.9 10.9 8 h after light 7.95 7.6 8.3 12 h after light 13.0 9.7 16.3 4 h after dark 17.1 5.0 29.2 8 h after dark 34.35 10.3 58.4 12 h after dark 11.0 10.1 11.9