Charles Clough said a little while ago that the thermometers are NOT calibrated (he’s a weather guy at Edgewood).
How much you wanna bet that they used similar thermometers to gather data to prove global warming.
And they stick them right in the middle of the city in a blacktop parking lot, in the middle of the summer.
Why calibrate the instrumentation as long as it's giving you the data that fits your ideology?