BFD. At sunset there can be an even greater “dip” in temperature.
This is propaganda, not science. Not even very accurate measurements are being taken, no consistency, and scarcely questioned, certainly not at any depth.
Incomplete data, improbable hypothesis, and trying to work the results from the conclusion back to the spotty collection of readings.
Sometimes called the Finagle Factor.
OK, suppose 'very accurate' measurements (of what) are possible.
Explain to me the meaning of "the temperature of the Earth".