What's the best way to calculate the average wind speed?

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I am randomly generating wind speed for the X and Z axes. Let's say I have that the wind is blowing X MPH in the north direction and Y MPH in the east direction. I want one final value for the wind's speed, though.

Is it accurate to just say that the wind's speed is equal to (X+Y)/2? So if the north wind speed is 11 MPH and the east wind speed is 2 MPH, the overall wind speed is 6.5 MPH?