There are two other things that must be taken into account when
considering running in the rain versus walking:  wetness per surface
area and puddles.

When running, one tends to collect water across the side of the body
facing the direction of rainfall (blowing at the back or from the
side, etc.).  In the case of most rains, where the vertical component
is the largest most of the time (except in wind gusts), walking slowly
ends with your head and shoulders being drenched but the rest of your
body being (relatively) drier.  Running of course reduces head and
shoulder dampness but spreads that over the rest of the body.  Your
choice as to which you prefer; I pick diffuse dampness and run.

Puddles become a much bigger problem when running- you must either
jump them or slow down for them.  Jumping can be a disaster, resulting
in a bigger splash than otherwise necessary.  Running through tends to
be exciting, especially for those nearby who are choosing NOT to run.

Mike H.
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