The National Weather Service office in San Diego, CA operates a cooperative observer network of weather stations, as do all NWS offices. The station in Coronado, CA, is particularly interesting since it is located on the roof of the Fire Station there.
Given that the MMTS sensor shown below is only about 2 feet above the tar and pea gravel roof, which is known to be a hot environment during the day, and a source for re-radiated heat at night, you have to wonder: “What were they thinking?”
Photo from NWS San Diego, click photo for larger image
The NOAA’s credit, this station is not part of the USHCN climate station network, but still, of what possible value could an air temperature measurement just 2 feet off the rooftop be to anyone?