This photo comes come to me from NOAA’s Weather Service Forecast Office in Monterey.
This is the official USHCN climate station of record for Livermore, CA. USHCN # 44997 The temperature sensor is located in a backyard of a residence within six feet of the swimming pool.
Here is the temperature trend from NASA GISS:
The question is: can an unbiased and accurate reading of temperature be obtained in somebody’s backyard next to their pool? With NOAA siting requirements saying a minimum of 100 feet from buildings, I would assume this would apply to pools too.
I couldn’t make this up if I tried.
You can see the picture without the annotations on the NWS website with this direct link: