condition mean min max 4 h after light 7.4 7.4 7.4 8 h after light 10.9 8.3 13.5 12 h after light 10.850000000000001 8.3 13.4 4 h after dark 5.25 4.0 6.5 8 h after dark 9.899999999999999 7.1 12.7 12 h after dark 20.099999999999998 6.4 33.8