diff --git a/ci/Jenkinsfile b/ci/Jenkinsfile
index c32aed6..a813f57 100644
--- a/ci/Jenkinsfile
+++ b/ci/Jenkinsfile
@@ -16,9 +16,16 @@ pipeline {
         disableConcurrentBuilds()
     }
 
+    triggers {
+        cron 'TZ=America/Chicago\n20 10 31 10 *'
+    }
+
     parameters {
         booleanParam \
             name: 'Clean',
+            defaultValue: currentBuild.getBuildCauses(
+                'hudson.triggers.timerTrigger$TimerTriggerCause'
+            ).size(),
             description: 'Clean the workspace and perform a full rebuild'
     }