condition mean min max 0 h after light 18.6157 18.0885 19.1429 4 h after light 16.2087 15.4063 17.0111 8 h after light 16.8024 16.7027 16.9021 4 h after dark 19.580199999999998 19.5732 19.5872 8 h after dark 17.14945 15.6618 18.6371 12 h after dark 17.264249999999997 16.7672 17.7613