condition mean min max 0 h after light 13.00885 12.7475 13.2702 4 h after light 18.4003 18.3709 18.4297 8 h after light 35.2205 33.1229 37.3181 4 h after dark 27.1435 25.9001 28.3869 8 h after dark 21.3034 21.0332 21.5736 12 h after dark 14.0236 12.2533 15.7939