We have seen that the sensor was reading 2.7 degrees F (1.5 degrees C) due to CPU heat affecting the readings. Your readings are a bit higher but is possible. Make sure the sensor is placed inside its compartment with the shiny rectangular component facing outwards and not blocked by the plastic of the case.
I haven’t heard of other users suggesting some specific calibration method although I believe there should be a non-linear function to link actual temp with reading.