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These sites discuss the speed of sound in a air and other gases. The speed of sound in a gas depends upon:
Temperature: http://hyperphysics.phy-astr.gsu.edu/hbase/sound/souspe.html
Humidity: http://www.measure.demon.co.uk/Acoustics_Software/speed.html
Altitude: http://www.grc.nasa.gov/WWW/K-12/airplane/sound.html
Type of Gas: http://hyperphysics.phy-astr.gsu.edu/hbase/sound/souspe3.html#c1
HyperPhysics by C.R. Nave at the University of Gerogia has some other notes on waves as well as the two calculators above.
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