condition mean min max 4 h after light 16.5887 14.132239 19.045161 8 h after light 15.421056 15.213811 15.628301 12 h after light 15.976205 15.925235 16.027175 4 h after dark 11.2535735 10.91648 11.590667 8 h after dark 13.944571 12.904936 14.984206 12 h after dark 13.844453 13.844453 13.844453