Max max for JSON array in Habpanel

Apps & Services HABPanel
,
1

I am trying to calculate the min and max for a json array.
This is how I currently use the JSON data.

<div ng-init="hours = $eval(itemState('WeatherHourly_json'));"></div>

How do i get the max and min of hours.temp.metric ?

My JSON looks a bit like this:

	"hours": [
		{
		"temp": {"english": "38", "metric": "3"},
		"feelslike": {"english": "33", "metric": "1"},
		"pop": "0",
		}
		,
		{
		"temp": {"english": "38", "metric": "2"},
		"feelslike": {"english": "33", "metric": "0"},
		"pop": "0",
		}
		,