At normal atmospheric pressure, the temperature dependence of the speed of a sound wave through dry air is approximated at (A).
(A):
\[ (velocity)={\ }(331){\ }*{\ }\sqrt{1+\frac{t_{c} ^{\circ}C}{273.15 ^{\circ}C}}{\ }*{\ } (SpeedConv){\ }ft/s \]
Notes: 
\[ \text{ }^{\circ}C\text{ }is\text{ }degrees\text{ }centigrade. \]
(SpeedConv): When used, converts (A) from meters-per-second to feet-per-second =
3.28083989502
(Simply the number of feet in 1 meter)
Equation (A) above, relating the speed of a sound wave in air to the temperature provides reasonably accurate speed values for         between 0° C and 100° C,  i.e., between 32° F and 212° F.
\[ t_{c}^\circ C \]
Try it (replace NULL with a temperature within the range):
° C Temperature (from 0 to 100):  
° F Temperature (from 32 to 212):