score:2

Accepted answer

You could use zones property for this.

        zones: [{
            value: 700,
            color: 'orange'
        }, {
            color: 'white'
        }]

Demo: http://jsfiddle.net/m3x3Lwc9/

score:3

You could check your data before using it in Highcharts and add color value for each point if requirements are met. Example: http://jsfiddle.net/nshkf75s/

Relevant part of code:

    series: [{
        name: 'Observations',
        data: [
            [760, 801, 848, 895, 965],
            [733, 853, 939, 980, 1080, 'orange'],
            [714, 762, 817, 870, 918],
            [724, 802, 806, 871, 950],
            [834, 836, 864, 882, 910]
        ],
        keys: ['low','q1','median','q3','high','color'],
        ...

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