condition mean min max 4 h after light 16.6 16.6 16.6 8 h after light 7.15 2.9 11.4 12 h after light 7.3500000000000005 2.9 11.8 4 h after dark 20.45 18.7 22.2 8 h after dark 5.9 5.9 5.9 12 h after dark 30.3 4.7 55.9