condition mean min max 4 h after light 1.4 1.4 1.4 8 h after light 4.4 3.6 5.2 12 h after light 22.9 9.4 36.4 4 h after dark 3.7 3.5 3.9 8 h after dark 2.45 0.9 4.0 12 h after dark 2.35 1.3 3.4