Question About Wind as it relates to fallout.

[Graebarde]

Life After Doomsday has a windrose table in the appendix that shows the wind speed and direction for locations all across the US.

Also remember that radiation starts to degrade at a factor 7/10 ( ten fold drop for every seven fold time) from time of detonation. The longer they are in the atmosphere the less lethal they are when they fall.