Accepted answer

one possible solution is to add years to date field like this

    date: "2010-october",
    price: "100"

if you are not going to display the year, it may be arbitrary, just make sure, that after december it increases by 1.

then replace var parsedate = d3.time.format("%b"); with var parsedate = d3.time.format("%y-%b");

also replace .call(xaxis.ticks(d3.time.year)); with .call(xaxis.ticks(d3.time.months));

here is the fiddle:

edit: if you can't add years manually, you can try to do this automatically like this:

var parsedate = d3.time.format("%y-%b");
data.foreach(function(d) {
  var year = 2000;
  d.values.foreach(function(d) {
    if ( === 'january') year++; = parsedate.parse(year.tostring() + '-' +;
    d.price = +d.price;

this code only works if all months are present (there are no gaps) and if january is represented exactly as "january" (i.e. it has the same case).

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