The plot is for January; eyeballing the one closer to St. Louis, it looks more like 2C than 3C, size-wize. There must be a text presentation of the data somewhere, but I don’t have time to look for it.
I am not trying to challenge you to a battle of the fastest searcher but instead want you to appreciate that we must be extremely certain and not just consensus-sure before we go half cocked off on a tear down the walls of industry witch hunt.
Read this link and see what a “scientist” can do with statistics and modeling of graphs:
http://motls.blogspot.com/2008/01/2007-warmest-year-on-record-coldest-in.html