diff --git a/src/lib/months.js b/src/lib/months.js
index e565c46..44e7e88 100644
--- a/src/lib/months.js
+++ b/src/lib/months.js
@@ -22,7 +22,7 @@ export function caTotal (months) {
 }
 
 export function caMean (months) {
-    return caTotal(months) / count(months)
+    return Math.floor(caTotal(months) / count(months))
 }