Accepted answer

Try to null all values in xAxis or use following code.

xAxis: {
        categories: ['Jan', 'Feb', 'Mar', 'Apr', 'May', 'Jun',
            'Jul', 'Aug', 'Sep', 'Oct', 'Nov', 'Dec'],
        labels: {
            enabled: false

Please see the example

See the Doc:

New Updates:

For avoiding decimals values on graph Axis(x/y), Add allowDecimals attributes.

See the Doc.

yAxis: {
        allowDecimals: false,
        title: {
            text: 'Temperature (°C)'
        plotLines: [{
            value: 0,
            width: 1,
            color: '#808080'

Please check the updated JSfiddle:

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