IMO, engine temperature measurement is dependent on a lot of factors. Ambient temperature is one. Cooling, be it electrical or mechanical is mainly dependent on ambient temperature and the coolant (air/water/chemical) circulation.

If you use temperature to profile your engine, make sure that the rest of the parameters are kept constant and don't base your profiling from someone else's data. He or she may be in a place where the temperature and air circulation are different from yours.