Linea D, Julio por hora

<!DOCTYPE html>
<meta charset="utf-8">
<style>

body {
  font: 10px sans-serif;
}

.axis path,
.axis line {
  fill: none;
  stroke: #000;
  shape-rendering: crispEdges;
}

.x.axis path {
  display: none;
}

.line {
  fill: none;
  stroke: steelblue;
  stroke-width: 1.5px;
}

</style>
<body>
<script src="https://d3js.org/d3.v3.min.js" charset="utf-8"></script>
<script>

var margin = {top: 40, right: 20, bottom: 30, left: 50},
    width = 1260 - margin.left - margin.right,
    height = 500 - margin.top - margin.bottom;

var parseDate = d3.time.format("%m/%d/%Y").parse;
var parseHour = d3.time.format("%H:%M").parse;

var x = d3.time.scale()
    .range([0, width]);

var y = d3.scale.linear()
    .range([height, 0]);

var xAxis = d3.svg.axis()
    .scale(x).ticks(20)
    .orient("bottom");

var yAxis = d3.svg.axis()
    .scale(y)
    .orient("left");

var line = d3.svg.line()
    // .defined(function(d) { return d.y != null; })
    .interpolate("monotone")
    .x(function(d) { return x(d.fecha); })
    .y(function(d) { return y(d.cantidad); });

var svg = d3.select("body").append("svg")
    .attr("width", width + margin.left + margin.right)
    .attr("height", height + margin.top + margin.bottom)
  .append("g")
    .attr("transform", "translate(" + margin.left + "," + margin.top + ")");

d3.csv("linea_d_junio-hora.csv", function(error, data) {
  data.forEach(function(d) {
    d.fecha = parseDate(d.fecha);
    d.hora = parseHour(d.hora);
    d.cantidad = +d.cantidad;
    console.log(d);
  });

x.domain(d3.extent(data, function(d) { return d.fecha; }));
  y.domain(d3.extent(data, function(d) { return d.cantidad; }));

svg.append("g")
      .attr("class", "x axis")
      .attr("transform", "translate(0," + height + ")")
      .call(xAxis);

svg.append("g")
      .attr("class", "y axis")
      .call(yAxis)
    .append("text")
      .attr("transform", "rotate(-90)")
      .attr("y", 6)
      .attr("dy", ".71em")
      .style("text-anchor", "end")
      .text("Cantidad de pasajeros");

svg.append("path")
      .datum(data)
      .attr("class", "line")
      .attr("d", line);
});

</script>

Modified http://d3js.org/d3.v3.min.js to a secure url

https://d3js.org/d3.v3.min.js