Why are temperatures taken in the shade, since humans don't have any?
Thermometers are kept in a shelter so the instrument is shaded. That way the instrument measures the air temperature, unaffected by sun heating up the casing of the instrument, or by heating of the ground surface below. That allows not only an accurate measurement of air temperature, but also an accurate comparison of temperatures between different locations. Humans do have shade, obviously more in some places than others.