I agree with your concerns about the weather being very different between the measured data and your location. Even the (relatively short) commute from where I live to where I work yields significant differences (often 10 or more degrees difference). You are right... neither the SportTrack program or the plugin would be able able to handle that.
Hmmm... wonder if it'd better to capture the temp, humidity, pressure, airspeed, etc directly from the car itself. Seems like that'd give you the 'best' numbers. Maybe one of those little "weather stations" tucked up in a protected area under the car? (so that it can get to the ambient temp rather than the in-car temp). Then it shouldn't be too much of a challenge to develop a custom plugin for that in order to take advantage of the very nice graphing and reporting capabilities of SportTracks.
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