Graphing every daily high temperature for July in Purcellville, VA, more than a century of daily readings up through last month. What global warming? Click for full view.
By Steve Haner
The constant media hysteria about July’s temperatures gets even harder to swallow when the long-term data are examined. For example, take a look at that graph above, which represents every daily high in July going back to the 19th Century at Purcellville in Loudoun County.
The Purcellville weather monitor is one of just 19 in Virginia with a long enough and reliable enough history to be included in National Oceanographic and Atmospheric Administration’s U.S. Historical Climatology Network. It is the closest Virginia USHCN monitor to the Washington metropolitan region, but like many of the selected monitors is not deep in an urban setting.
The graph itself was generated by a program developed by a regular writer on climate topics named Tony Heller, who spent much of his career doing research at the Los Alamos and Sandia national laboratories. This is mentioned because he will be attacked by the Bacon’s Rebellion usual suspects as not a real scientist or not a climate scientist. More of his background.
The graphing program can be balky (it could be my equipment or operator error), and you can try it yourself here under “Daily Station Temperatures.” You can select by state, and if you get the version that includes a box at the top marked “Annual Average,” that gives you a pulldown menu for the individual USHCN monitor stations in each state. The graph adds a trend line if you wish, which I included in my screenshots.
Running through the Virginia stations, the thought that comes to mind is, what climate change? What spike in temperatures? Most seem to be complete through all or most of last month. The media coverage has admitted that Virginia was not among the areas supposedly “broiling.” The state’s official NOAA summary claims a temperature rise of only 1.5 degrees Fahrenheit since 1900, almost 125 years. Continue reading →
(This was first published today by the Thomas Jefferson Institute for Public Policy)
