altitude by pressure requires usually a calibration when being at a point of known altitude and stays valid only when no pressure change due to weather changes happens... That was the best we got in the days of me mountain climbing without GPS - but with an altimeter / barometer. I'd be surprised if this sensor could do better. Taking altitude from temperature is even more a gamble... but yes in general, it works. That would confirm you observing that there is a dependency... May be the sensor is so smart that it takes both into account and tries to make 'some' sense out of them. (Attachment taken from http://ww2010.atmos.uiuc.edu/(Gh)/guides/mtr/prs/hght.rxml )
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