condition mean min max 4 h after light 7.1 7.1 7.1 8 h after light 17.85 12.7 23.0 12 h after light 10.45 2.0 18.9 4 h after dark 11.299999999999999 2.2 20.4 8 h after dark 4.45 1.7 7.2 12 h after dark 13.15 3.3 23.0