title: How to make a monthly boxplot for each group in a data frame in python
body: <p>I have some data like this:</p>
  
  <pre><code>    Export Country  Import Terminal  Arrival Date  Value
       Country            Port A         1/15     135138
       Country            Port A         1/15     153232
       Country            Port A         3/15     116116
          .                  .             .           .
          .                  .             .           .
          .                  .             .           .
          .                  .             .           .
       Country            Port B         1/15     155462
       Country            Port B         2/15     116532
       Country            Port B         1/16     456321
       Country            Port B         2/16     865313
          .                  .             .           .
          .                  .             .           .
          .                  .             .           .
          .                  .             .           .
  </code></pre>
  
  <p>I used df = df.groupby(['Import Terminal', 'Arrival Date'])[Value].sum() and ended with:</p>
  
  <pre><code>Import Terminal   Arrival    Sum of Value 
      Port A         1/15        288370
                     3/15        116116
                       .            .
                       .            .
      Port B         1/15        155462
                       .            .
                       .            .
  </code></pre>
  
  <p>Now I need to go through each Import Terminal and make a monthly box plot for each one, using the Arrival Month and Sum of Value columns. How can I do this, I am lost on this.</p>