I can’t think of a location within the bodywork of a car that would provide accurate data considering wind-chill when it’s moving, excessive heat from either the engine, or stationary in the sun.
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The outside air temperature in a car is normally measured at the Mass Airflow Sensor(MAF). It is quite accurate as it is used to determine just how much air is entering the engine and then to add the correct amount of fuel.
This is normally done by measuring the temperature before the MAF, adding heat, and measuring it right after the MAF.
The difference between the two tells the car how much air, so the sensors are very accurate and very fast.
There are times when this can be wrong, but then MAF still works for fuel, as it only cares about the difference, not the actual temperature
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