demo-multiple

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<!DOCTYPE html>
<meta charset="utf-8">
<style> /* set the CSS */

body { font: 12px Arial;}

path { 
    stroke: steelblue;
    stroke-width: 2;
    fill: none;
}

.axis path,
.axis line {
    fill: none;
    stroke: grey;
    stroke-width: 1;
    shape-rendering: crispEdges;
}

.legend {
    font-size: 16px;
    font-weight: bold;
    text-anchor: middle;
}

</style>
<body>

<script src="https://d3js.org/d3.v3.min.js"></script>

// Set the dimensions of the canvas / graph
var margin = {top: 30, right: 20, bottom: 70, left: 50},
    width = 600 - margin.left - margin.right,
    height = 300 - margin.top - margin.bottom;

// Parse the date / time
var parseDate = d3.time.format("%H");

// Set the ranges
var x = d3.time.scale().range([0, width]);  
var y = d3.scale.linear().range([height, 0]);

// Define the line
var priceline = d3.svg.line()	
    .x(function(d) { return x(d.key); })
    .y(function(d) { return y(d.values); });
    
// Adds the svg canvas
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 + ")");

// Get the data
d3.csv("weather2.csv", function(error, data) {
    data.forEach(function(d) {
		    d.hour = parseDate.parse(d.HOUR);
        d.weather = d.WEATHER;
        d.count = +d.FATAL_COUNT;
    });

// Scale the range of the data
    x.domain(d3.extent(data, function(d) { return d.hour; }));
    y.domain([0, 1500]);
  
  // Define the axis
    var xAxis = d3.svg.axis().scale(x)
                             .orient("bottom");

// Nest the entries by symbol
    var dataNest = d3.nest()
        .key(function(d) {return d.weather;})
        .key(function(d) {return d.hour;})
        .rollup(function(d) {
          return d3.sum(d, function(v) {return v.count;});
        })
        .entries(data);

// set the colour scale
    var color = d3.scale.category10();

// Loop through each symbol / key
    dataNest.forEach(function(d,i) { 
      console.log(d);

svg.append("path")
            .attr("class", "line")
            .style("stroke", function() { // Add the colours dynamically
                return d.color = color(d.key); })
            .attr("id", 'tag'+d.key.replace(/\s+/g, '')) // assign an ID
            .attr("d", priceline(d.values));

});
  svg.append("g")
           .attr("class", "axis")
           .attr("transform", "translate(0," + height + ")")
           .call(xAxis);
/*
  // Add the X Axis
  svg.append("g")
      .attr("class", "axis")
      .attr("transform", "translate(0," + height + ")")
      .call(d3.axisBottom(x));

// Add the Y Axis
  svg.append("g")
      .attr("class", "axis")
      .call(d3.axisLeft(y));
*/
});

</script>
</body>

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