--- a/jsapp/components/author/charts/reports_chart.js
+++ b/jsapp/components/author/charts/reports_chart.js
@@ -122,29 +122,27 @@ GetSmart.ReportsChartComponent = Ember.Component.extend({
   // (day data might be way too much)
   aggregateData: function (data) {
     function resetWk() {
-      return { count: 0 };
+      return { count: 0, length: 0 };
     }
     function averageWk(wk, numDays) {
       return wk.count / numDays;
     }

-    var week = resetWk();
+    var week;
     var aggregatedData = [];
-    var lastWkNum = -1;
-    var numDaysInWeek = 0;
     data.forEach(function (datum) {
       var wkNum = moment(datum.date).week();
-      if (lastWkNum > -1 && wkNum !== lastWkNum) {
-        week.count = averageWk(week, numDaysInWeek);
+      if (!week || wkNum !== week.number) {
+        week = resetWk();
+        week.number = wkNum;
         week.date = aggregatedData.length + 1;
         aggregatedData.push(week);
-
-        week = resetWk();
-        numDaysInWeek = 0;
       }
       week.count += datum.count;
-      lastWkNum = wkNum;
-      numDaysInWeek++;
+      week.length++;
+    });
+    aggregatedData.forEach(function(week) {
+      week.count /= week.length;
     });
     return aggregatedData;
   },