A ball hit with or against the wind gains or loses 3' of distance for every 1 mph of wind speed.  On September 17, 1958 Mickey unloads, left handed, a rocket that cleared the Briggs Stadium roof so quickly, pitcher John James says he barely saw it happen.  He writes: "I had only been with the club a couple of weeks so I wasn't used to seeing Mickey hit.  When he hit the ball, the sound of the bat on the ball was the loudest I'd ever heard.  When the ball cleared everything over the roof, I didn't know if that was a common occurrence or something special.  By the reaction of the others in the bull pen, it became apparent it was special.  A lot of expletives, expressions of awe, pointing and talk.  The hardest ball I ever saw hit was the one Mantle hit over the right field roof in Detroit."

The ball was fair by 10' at the foul pole and by the time it cleared the roof and struck the cab company building across the street, it was probably in foul territory.  The distance to this building is 475'-478' down the line.  It hit the building approximately 18' above the ground, for this we can add about 10' more.  The National Climatic Data Center states the winds for that time of day came in from the direction of the foul pole in right field.  The ball was hit into the teeth of a 20-27mph wind.  Using the conservative number, this would add a minimum of 60' to the distance of this home run, without wind.  On a humid day, this home run might lose 15' of distance.  Or on a very humid day, 25'.