order selection function with grouping by month

public IEnumerable<Order> GetOrdersByMonth(int year)
{
    var orders = from order in _orders
                 where order.OrderedDate.Year == year
                 group order by order.OrderedDate.Month into g
                 orderby g.Key
                 select g;

    foreach (var group in orders)
    {
        Console.WriteLine($"Month: {group.Key}");
        foreach (var order in group)
        {
            Console.WriteLine($"\t{order}");
        }
    }
}