Aircraft altimeters are subject to the following errors and weather factors: Instrument error.Position error from aircraft static pressure systems.Nonstandard atmospheric pressure.
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When you set your altimeter to 29.92, you're flying at standard pressure altitude. This is the altitude of the aircraft above the standard datum plane, the theoretical location where at 15 degrees Celsius the altimeter setting will equal 29.92 inches of mercury.
When the ambient (at altitude) temperature is colder than standard, the aircraft's true altitude is lower than the indicated barometric altitude. When the ambient temperature is warmer than the standard day, the aircraft's true altitude is higher than the indicated barometric altitude.
You reset your altimeter to match local, nonstandard station pressure readings, using the Kollsman window on your altimeter. This is usually done every 100NM for aircraft flying below FL180.