See table by date

I have a table that data is written as follows:

ID CANAL VALOR DATA
25 10    50    2016-10-14 14:10:05
26 11    12    2016-10-14 14:10:06
27 10    51    2016-10-14 15:10:10

Both records are recorded hourly, so I need to look at them and show them one by one per channel.

I'm doing it this way:

$contador = 0;
while($contador <= 24){

  if($contador == 0){
    $horario[$contador] = '00:00';
  } else {
    $horario[$contador] = '0'.$contador.':00';
  }

  $data = "2016-10-14";

  $query = $pdo->query("SELECT * FROM valores_d WHERE data_hora BETWEEN ('2016-13 12:00:00') AND ('2016-10-15 13:00:00') order by id desc limit 1");
  $resultado = $query->fetch(PDO::FETCH_ASSOC);

  $arr[$contador] = $resultado['valor'];

  $contador++;

}