condition mean min max 4 h after light 5.7 5.7 5.7 8 h after light 24.4 11.8 37.0 12 h after light 15.25 12.1 18.4 4 h after dark 26.55 18.1 35.0 8 h after dark 1.6 1.6 1.6 12 h after dark 7.85 3.1 12.6