By Patrick J. Michaels and Ryan Maue, Center for the Study of Science, Cato Institute
Re-Blogged From http://www.WattsUpWithThat.com
JRA-55—BETTER THAN THE BEST GLOBAL SURFACE TEMPERATURE HISTORY, AND COOLER THAN THE REST.
Let’s face it, global surface temperature histories measured by thermometers are a mess. Recording stations come on-and offline seemingly at random. The time of day when the high and low temperatures for the previous 24 hours are recorded varies, often changing at the same station. Local conditions can bias temperatures. And the “urban heat island” can artificially warm readings with population levels as low as 2500. Neighboring reporting stations can diverge significantly from each other.