diff --git a/src/app/components/dashboard/dashboard.component.ts b/src/app/components/dashboard/dashboard.component.ts
index 0d56b47..d886512 100644
--- a/src/app/components/dashboard/dashboard.component.ts
+++ b/src/app/components/dashboard/dashboard.component.ts
@@ -74,7 +74,7 @@ export class DashboardComponent implements AfterViewInit {
         for (let i = GROUP_SIZE; i < chartData.length; i += GROUP_SIZE) {
           let sum = 0;
           for (let j = GROUP_SIZE - 1; j >= 0; j--) {
-            sum += chartData[i - j].data;
+            sum += parseInt(chartData[i - j].data);
           }
           sum = sum / GROUP_SIZE;
           hourlyData.push({ y: sum, x: chartData[i].label });