  A numerical model of 100 m and 200 m world class sprinting performances is
modified using standard hydrodynamic principles to include effects of air
temperature, pressure, and humidity levels on aerodynamic drag. The magnitude
of the effects are found to be dependent on wind speed. This implies that
differing atmospheric conditions can yield slightly different corrections for
the same wind gauge reading. In the absence of wind, temperature is found to
induce the largest variation in times (0.01 s per $10\dc$ increment in the 100
m), while relative humidity contributes the least (under 0.01 s for all
realistic conditions for 100 m). Barometric pressure variations at a particular
venue can also introduce fluctuations in performance times on the order of a
0.01 s for this race. The combination of all three variables is essentially
additive, and is more important for head-wind conditions that for tail-winds.
As expected, calculated corrections in the 200 m are magnified due to the
longer duration of the race. The overall effects of these factors on sprint
times can be considered a ``second order'' adjustment to previous methods which
rely strictly on a venue's physical elevation, but can become important in
extreme conditions.
