Custom Post Type Archives

I created a custom post type (newradio) and have the main archive page working. So if I go to mysite.com/newradio the archive shows up fine. I want to have an archive list list the posts page so that if I go to mysite.com/newradio/2016 it will show all for 2016 and mysite.com/newradio/2016/06 will show all for June of 2016. I get an error 404 for any of the filtered down archive pages.

Is there something in my definition of my post type that needs to change?

$labels = array(
			'name' => _x('Our Radio', 'post type general name'),
			'singular_name' => _x('Our Radios', 'post type singular name'),
			'add_new' => _x('Add New', 'our_classes'),
			'add_new_item' => __('Add Radio'),
			'edit_item' => __('Edit Radio'),
			'new_item' => __('Add Radio'),
			'all_items' => __('All Radios'),
			'view_item' => __('View Our Radio'),
			'search_items' => __('Search Radio'),
			'not_found' =>  __('No Result found'),
			'not_found_in_trash' => __('No Result found in Trash'),
			'parent_item_colon' => '',
			'menu_name' => 'Radio Shows'
		);
		$args = array(
			'labels' => $labels,
			'public' => true,
			'publicly_queryable' => true,
			'show_ui' => true,
			'show_in_menu' => true,
			'query_var' => true,
			'rewrite' => true,
			'capability_type' => 'post',
			'has_archive' => true,
			'hierarchical' => false,
			'menu_position' => null,
			'supports' => array('title', 'editor', 'thumbnail','excerpt')
		);
		register_post_type('newRadio', $args);

Or do I need to do something in my archive page or with pre_get_posts? I feel like I’m missing something basic that will enable this.