condition mean min max 4 h after light 5.5 5.5 5.5 8 h after light 5.8 5.0 6.6 12 h after light 20.650000000000002 8.1 33.2 4 h after dark 17.0 13.3 20.7 8 h after dark 9.9 6.9 12.9 12 h after dark 9.8 9.0 10.6