How to hide a specific category posts in my monthly archive?

There are two ways of doing it:

You can use a filter to alter the query when viewing an archive page. You will need to find the ID of your category ‘blogs’ (you can obtain it from the slug using get_term_by). Alternatively you can exclude a particular category by ID.

add_action( 'pre_get_posts', 'my_change_query'); 
    function my_change_query($query){
        if(is_archive()){
           $blog_term = get_term_by('slug', 'blogs', 'category');
           $blog_term_id = $blog_term->term_id;
           $query->set('cat', $blog_term_id);//Include category with ID $blog_term_id
           //$query->set('cat','-'.$blog_term_id);//Exclude category with ID  $blog_term_id
        }  
     return $query
    };

or, more commonly, you can alter the archive.php template file and insert the following just above the if(have_posts()).

global $wp_query;
$args = array_merge( $wp_query->query, array( 'category_name' => 'blogs' ) );
query_posts( $args );

See the Codex on query_posts and WP_Query.

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