[GTS Dean]

In case anyone is interested, Dec 7 weather data from Randolph AFB near the track.

 

[John Myrick]

The density altitude was right around -50 ft around qualifying time.

Here's another source of weather data for comparison...

http://www.weatherunderground.com/history/airport/KSAT/2003/12/7/DailyHistory.html?FULLALMANAC=KSAT