The speed of sound in dry air at 0°C is approximately 331 to 333 meters per second. A commonly accepted value is about 331 m/s , derived from the formula v=3311+TC273v=331\sqrt{1+\frac{T_C}{273}}v=3311+273TC​​​ where TCT_CTC​ is the temperature in Celsius. At 0°C, this simplifies to roughly 331 m/s

. Other sources give values close to this, such as 332 m/s or 333 m/s at 0°C, reflecting minor variations due to measurement conditions and calculation methods

. The speed increases by about 0.6 m/s for each degree Celsius increase in temperature, so at 20°C it is about 343 m/s

. In summary:

• Speed of sound in dry air at 0°C ≈ 331 m/s to 333 m/s
• Increases roughly 0.6 m/s per °C rise in temperature
• Independent of pressure and mostly dependent on temperature and air composition

This value is widely used in physics and engineering for calculations involving sound propagation in air at freezing temperatures