malacay:
The temperature doesnt vary usually, the speed of sound doesnt change so much.
Why?
I think the question should be: why bother?
Air pressure also changes the speed of sound. Higher pressure means faster sound.
Such effects only become relevant if the error is significant. If the speed of sound changes by maybe 0.01% over your common temperature range, but your error due to other causes is 1%, it's a total waste of effort.