George I am not sure how one can conclude that it was not raining? I am looking at some OR's written by one of several escort units of Jeff Davis which state "it has rained most profoundly the past 3 days".

The statement/quote that Shelby references "their uniforms dark in the pearly glow before sunrise," is not a indicator that it was or was not raining, perhaps it was showering, as I have seen the pearly glow of sunrise a many a time while raining.