condition mean min max 4 h after light 8.8 8.8 8.8 8 h after light 2.95 2.6 3.3 12 h after light 2.2 1.8 2.6 4 h after dark 2.8 1.6 4.0 8 h after dark 12.049999999999999 1.9 22.2 12 h after dark 3.7 1.5 5.9