Surface Stations is a project initiated by retired weatherman Anthony Watts. Its purpose is to refute Global Warming by snapping pictures of NOAA weather stations with siting issues and posting them to Conservative websites, where folks who, in general, wouldn't know a surface station from a hole in the ground then cry out "shame! shame!" in unison in the hopes of attracting the attention of Talk Radio.
As of today, the gang at Surface Stations are within a hair of having surveyed one quarter of the USHCN stations--281 to be precise--in the lower 48 states of the U.S.A. Their locations are given in the graphic above. What is fairly clear from this graphic is that SS's efforts have been concentrated 1) on the West Coast (Anthony Watts home state is California), and 2) wherever else their volunteers hail from. For example, surveys from Maine are (I am guessing) largely the work of Kristen Byrnes, the famous denying munchkin. There is a further clear trend towards surveying urban areas, also probably due to the demographics of the people making up Watt's volunteers.
Given that urban stations are more likely to be subject to siting compromises (fewer wide open fields, more asphalt), it is I think significant that only 10 per cent of the sites having been noted as not being in compliance with NOAA . Or at least, Mr. Watts has only felt obliged to scream outrage on 28 occasions.