You can use Ember.Select. Docs link is http://emberjs.com/api/classes/Ember.Select.html
In your case
App.ApplicationController = Ember.Controller.extend({
selectedMonth: null,
months: [
{text: "05 - 2014", value: "2014-05"}
],
changeMonth: function(){
//do changes whatever you want on dropdown change
}.observes('selectedMonth')
});
{view Ember.Select
content=months
optionValuePath="content.value"
optionLabelPath="content.text"
selection=selectedMonth}}