Index: wp-admin/includes/class-wp-list-table.php
===================================================================
--- wp-admin/includes/class-wp-list-table.php	(revision 17581)
+++ wp-admin/includes/class-wp-list-table.php	(working copy)
@@ -345,12 +345,12 @@
 	function months_dropdown( $post_type ) {
 		global $wpdb, $wp_locale;
 
-		$months = $wpdb->get_results( $wpdb->prepare( "
+		$months = $wpdb->get_results( apply_filters( 'months_dropdown_query', $wpdb->prepare( "
 			SELECT DISTINCT YEAR( post_date ) AS year, MONTH( post_date ) AS month
 			FROM $wpdb->posts
 			WHERE post_type = %s
 			ORDER BY post_date DESC
-		", $post_type ) );
+		", $post_type ), $post_type ) );
 
 		$month_count = count( $months );