So I've been having climb performance issues and I came to the forums to determine what may be wrong. It seems, as others have experienced, that outside temperature is sky-rocketing far too high. So I disabled FSINN Weather, loaded "Real World" FSX Weather, and sat back to watch what would happen. As a side-measure I put the 34A8/FLT64 debugging into FSUIPC (to show ambient temp). I find now, as I pass through 10,000ft, my TAT shows +12c, but the debug from FSUIPC shows +2c. So with FSINN weather disabled, FSX weather being used, why are temperatures so far off in the aircraft? As an FYI, I'm flying the 737NGX-800WL UPDATE: As I pass FL160, the temperature starts climbing again. at +8c and going up. Thanks,Matthew Adair