title: Plot time series of different years together
body: <p>I am trying to compare different years' variables but I am having trouble plotting them together.
  The time series is a temperature series which can be found in <a href="https://github.com/gonzalodqa/timeseries" rel="nofollow noreferrer">https://github.com/gonzalodqa/timeseries</a> as temp.csv
  I would like to plot something like the image but I find it difficult to subset the months between the years and then combine the lines in the same plot under the same months
  <a href="https://i.stack.imgur.com/JpwEG.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/JpwEG.png" alt="enter image description here" /></a></p>
  <p>If someone can give some advice or point me in the right direction I would really appreciate it</p>