title: Pandas Dataframe, getting average value for each monday 1 Am
body: <p>my DataFrame looks like this:</p>
  
  <pre><code>index                   value
  2016-03-21 00:00:00     0.613014
  2016-03-21 01:00:00     0.596383
  2016-03-21 02:00:00     0.623570
  2016-03-21 03:00:00     0.663350
  2016-03-21 04:00:00     0.677817
  2016-03-21 05:00:00     0.727116
  2016-03-21 06:00:00     0.920279
  2016-03-21 07:00:00     1.205863
  2016-03-21 08:00:00     0.880946
  2016-03-21 09:00:00     0.186947
  2016-03-21 10:00:00     -0.563276
  2016-03-21 11:00:00     -1.249595
  2016-03-21 12:00:00     -1.596035
  2016-03-21 13:00:00     -1.886954
  2016-03-21 14:00:00     -1.912325
  2016-03-21 15:00:00     -1.750623
  ...     
  2016-06-20 23:00:00     2.125791
  </code></pre>
  
  <p>I am trying to get the average for each monday at 1 am in the dataframe. In the end I want to have an output that represents the 'average week' of the dataframe, so I can visualize the course of the week.</p>
  
  <p>I hope I could express myself clearly.</p>
  
  <p>Thanks for your help!</p>