weather by date

<!DOCTYPE html>
<head>
  <meta charset="utf-8">
  <script src="https://d3js.org/d3.v4.min.js"></script>
  <style>
    body { margin:0;position:fixed;top:0;right:0;bottom:0;left:0; }
  </style>
</head>

<body>
  <svg></svg>
  <script>
	svg = d3.select('svg');
    
    var city='San Francisco';
    var width=800;
    var height=300;
    var margin={top:20, bottom:20, left:20, right:20};
    var x=d3.tsv('data.tsv');
    console.log(x);
    d3.tsv('data.tsv',(err, data) =>{
//       console.log(data);    
      data.forEach(d => {
      d.date=d3.timeParse("%Y%m%d")(data.date);
    	d.date=new Date(d.date); //x
      ++d[city]; //change to integer
    });
 //Extent
      xExtent=d3.extent(data, d => d.date);
//       console.log(xExntent);
//  //scale
//       xScale=d3.scaleTime()
//       .domain(xExtent)
//       .range(margin.left, width-margin.right);
      
      
    rect = svg.selectAll('rect')
    .data(data)
    .enter()
    .append('rect')
    .attr('width',20);
    });

</script>
</body>

https://d3js.org/d3.v4.min.js