This is a very long line. It would read better if you broke it out into several lines. Whitespace is a good thing!

        urls.push({
            "url": "http://lists.numenta.org/pipermail/nupic_lists.numenta.org/" 
                    + year + "-" + monthNames[month] + "/date.html",
            "month": month,
            "year": year,
            "arrayPos": arrayPos
        });