The speed of sound in air varies with temperature. The formula for the speed of sound in air is:
v = 331.5 + 0.6T
where v is the speed of sound in meters per second and T is the temperature in degrees Celsius.
Substituting T = -36°C into the formula, we get:
v = 331.5 + 0.6(-36)
v = 331.5 - 21.6
v = 309.9 m/s
Therefore, the speed of sound in air at -36 degrees Celsius is approximately 309.9 meters per second.