condition mean min max 4 h after light 5.1 5.1 5.1 8 h after light 17.4 4.4 30.4 12 h after light 20.45 1.6 39.3 4 h after dark 16.799999999999997 13.2 20.4 8 h after dark 9.9 1.0 18.8 12 h after dark 17.900000000000002 1.1 34.7