Seasons of High and Low TIdes

This is an important topic.  I will not discuss it.  Here is a graph I have been working on to try to understand this question.  What times are highest and lowest tides?  Is there a seasonal difference?

This may make better sense than the accompanying post.

This is still a work in progress.  In this instance I am manually inducing "jitter" by using differing increments of time for the predictions for each month.  This is not ideal yet.  

The original with a gray background.  Better for printing.  Still a work in progress.   Are these colors colorblind friendly?