The approximate speed of sound in dry (0% humidity) air, in meters per second, at temperatures near 0 °C, can be calculated from
[tex]c_{air} = (331.3+0.606 \upsilon)[/tex]
Here
[tex]\upsilon =[/tex] Temperature in Celsius
Replacing with our values we have that
[tex]\upsilon=58\° C[/tex]
[tex]c_{air} = (331.3+0.606*58)[/tex]
[tex]c_{air} = 366.1m/s[/tex]
Therefore the speed of sound in air at that temperature is 366.1m/s