condition mean min max 4 h after light 31.9 31.9 31.9 8 h after light 8.4 1.6 15.2 12 h after light 4.0 3.6 4.4 4 h after dark 31.35 5.0 57.7 8 h after dark 14.05 9.8 18.3 12 h after dark 3.45 2.7 4.2