condition mean min max 4 h after light 7.5 7.5 7.5 8 h after light 3.85 3.3 4.4 12 h after light 7.1499999999999995 6.1 8.2 4 h after dark 11.45 10.7 12.2 8 h after dark 9.3 4.8 13.8 12 h after dark 6.8 5.6 8.0