condition mean min max 4 h after light 5.6 5.6 5.6 8 h after light 9.7 6.6 12.8 12 h after light 17.25 4.4 30.1 4 h after dark 12.5 9.3 15.7 8 h after dark 5.2 4.2 6.2 12 h after dark 24.85 5.7 44.0