Index: wp-includes/default-widgets.php
===================================================================
--- wp-includes/default-widgets.php	(revision 31162)
+++ wp-includes/default-widgets.php	(working copy)
@@ -287,7 +287,7 @@
 		if ( $d ) {
 ?>
 		<select name="archive-dropdown" onchange='document.location.href=this.options[this.selectedIndex].value;'>
-			<option value=""><?php esc_attr_e( 'Select Month' ); ?></option>
+			<option value=""><?php esc_attr_e( apply_filters( 'widget_archives_dropdown_first', 'Select Month' ) ); ?></option>
 
 			<?php
 			/**