condition mean min max 4 h after light 7.6 7.6 7.6 8 h after light 7.0 3.9 10.1 12 h after light 6.8 2.4 11.2 4 h after dark 36.25 23.6 48.9 8 h after dark 7.65 7.3 8.0 12 h after dark 7.4 3.5 11.3