In the building codes, this conversion is common use the formula: P = 0.00256 x V2 , where: P = wind pressure and V = wind speed.

example: 110 (mph) x 110 (mph) x .00256 = 30.97(psf)

This is as close to your request as I can get. There is so many difference factor envolved in this that a firm anwser is just not possible. I have multi-books covering designs and wind loads from direct wind pressure and negative pressure (which is many times more damaging often)

But for your request on a general rule try the above. (remember it is only a guide, and a rough one at that)