Mean kinetic energy is related to temperature: $$\langle K_E\rangle=\frac{3}{2}kT=\frac{1}{2}mv^2$$
where $k$ is the Boltzmann constant and $T$ the temperature in Kelvin.
For example, the average molar mass of air is 29 g/mol, the average $K_E$ of air molecules at 20°C (293K) is approximately $6\times10^{-21}$ J calculated from the equation above. (I assume air is an ideal gas which it isn’t, but it gives an approximate answer)
The average mass of one molecule of air is $4.8\times10^{-26}$ kg and the average speed of one molecule of air at 20°C (293K) is approximately 500 m/s based on my calculation.
I couldn't understand why the theoretical average speed of air molecules is so high. Perhaps my understanding is completely wrong, but does that mean an air molecule is travelling above the speed of sound in air at STP which is only 343 m/s? Also, does the average speed of air molecules impact wind speed? It sounds quite frantic, but the highest wind speed ever recorded on Earth is only 113 m/s compared to an average speed of 500 m/s of an air molecule.