Month Axis

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

.axis text {
  font: 10px sans-serif;
}

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

</style>
<body>
<script src="//d3js.org/d3.v3.min.js"></script>
<script>

var margin = {top: 10, right: 10, bottom: 20, left: 10},
    width = 960 - margin.left - margin.right,
    height = 80 - margin.top - margin.bottom;

var x = d3.time.scale()
    .domain([new Date(2012, 0, 1), new Date(2012, 11, 31)])
    .range([0, width]);

var xAxis = d3.svg.axis()
    .scale(x)
    .orient("bottom")
    .ticks(d3.time.months)
    .tickSize(16, 0)
    .tickFormat(d3.time.format("%B"));

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 + ")");

svg.append("g")
    .attr("class", "x axis")
    .attr("transform", "translate(0," + height + ")")
    .call(xAxis)
  .selectAll(".tick text")
    .style("text-anchor", "start")
    .attr("x", 6)
    .attr("y", 6);

</script>

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