condition mean min max 4 h after light 41.4 41.4 41.4 8 h after light 9.3 7.0 11.6 12 h after light 3.15 2.9 3.4 4 h after dark 2.4 2.0 2.8 8 h after dark 2.35 2.2 2.5 12 h after dark 19.85 5.2 34.5