condition mean min max 4 h after light 8.1 8.1 8.1 8 h after light 6.15 5.8 6.5 12 h after light 5.1 4.6 5.6 4 h after dark 4.85 4.6 5.1 8 h after dark 6.199999999999999 5.8 6.6 12 h after dark 7.1 5.2 9.0