S Green wrote:


Have a look at the cold weather adjustments needed for instruments
approaches. As the temperature deviates from ISA whilst the altimeter could
be reading 200' you will actually be well under and enough to bust a
checkride. For example, an ISA deviation of -15C is an correction of 12'.
approximately 4ft/1000ft for each C of difference. In this case, -15C ISA
is only a temperature of 0C or 32F.



That isn't done for instrument approaches in the U.S. except for VNAV
final segments on RNP SAAAR IAPs.