B737GDog

I have yet to put my '89 GT on a dyno but, the PO did. I have a question about the results from the PO's runs. Dynorun #1 for example shows Max Power of 269 and Max Torque of 266. On the second printout, Dynorun #1(same date and time), Max Power is 292 and Max Torque is 289. Are the higher numbers a result of an adjustment made based on temp., pressure, height above sea level etc.? If so, what temp and pressure are used as the standard? The car was dynoed in mid July so I am sure the temp was high. Thanks for insight as to how the process works.