score:7

Accepted answer

A feature to solve this without "hacks" was added in Highcharts 4.1.0 (February 2015), called zones (API). The given problem can be solved like this, using zones:

plotOptions: {
    series: {
        zones: [{
            value: 0, // Values up to 0 (not including) ...
            color: 'blue' // ... have the color blue
        },{
            value: 10, // Values up to 10 (not including) ...
            color: 'orange' // ... have the color orange
        },{
            color: 'red' // Values from 10 (including) and up have the color red
        }]
    }
}

See this JSFiddle demonstration of how it looks.

score:0

By the way, I can try use a plotLine, like this:

 yAxis: {
                title: {
                    text: 'My Chart'
                },
                plotLines: [{
                    id: 'limit-min',
                    dashStyle: 'ShortDash',
                    width: 2,
                    value: 80,
                    zIndex: 0,
                    label : {
                        text : '80% limit'
                    }
                }, {
                    id: 'limit-max',
                    color: '#008000',
                    dashStyle: 'ShortDash',
                    width: 2,
                    value: 90,
                    zIndex: 0,
                    label : {
                        text : '90% limit'
                    }
                }]
            },

score:1

Unfortunately this option is not possible, but you can request your suggestion in http://highcharts.uservoice.com and vote for it.

score:9

It actually is possible if you don't mind plotting the data twice.

    $('#container').highcharts({

        chart: {
            type: 'arearange'
        },

        title: {
            text: 'Temperature variation by day'
        },

        xAxis: {
            type: 'datetime'
        },

        yAxis: {
            title: {
                text: null
            }
        },

        tooltip: {
            crosshairs: true,
            shared: true,
            valueSuffix: '°C'
        },

        legend: {
            enabled: false
        },

        series: [{
            name: 'Temperatures',
            threshold : 0,
            data: data,
            color: 'orange',
            negativeColor: 'blue'
        },
        {
            name: 'Temperatures',
            threshold : 10,
            data: data,
            color: 'red',
            negativeColor: 'transparent'
        }]
    });
});

http://jsfiddle.net/YWVHx/97/


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