The speculation is over, it’s official. Even with a somewhat chilled final day of the month, June 2010 finished as the warmest on record for both D.C. and Dulles.
That is the point of this post at the Washington Post’s weather blog. How do they illustrate this fact? With this abominable graph:
Which is captioned:
The top 15 warmest Junes on record since 1871 in Washington, D.C. 2010 set a new record by a significant margin.
Where to begin? The Excel defaults. The weird choice of putting ranked data on a horizontal graph than a vertical column. The fact that the most recent year ends up being on the lefthand side, when the eye is used to “reading time” left to right. I’m sure there are more flaws than these.
More the point, why not just show all the data? Here is my attempt at a graph, with a smoothed trend line included.