Arithmetic

Given the following facts:

     A: It rains a lot in New Orleans

     B: People generally improve at a skill with repetition

One would assume:

     A + B = Average New Orleanean proficient with wet weather driving

But sadly, that is not so.

Strangely, the opposite is true, and my morning commute took twice as long due to a light drizzle. But I entertained myself by compulsively screaming out "GO!!" at random intervals in Tourette's fashion.