Raybo -

Rain is wet.

I will ride in a light shower or if I am really close.
But, generally, when it rains - I stop.
I am usually not itinerary driven - so I stop.
I do not like being a drenched dog.
Even with a Leak-Tex North Face jacket, I get sweaty.
And the gods may punish me for all the curses sent heavenwards.

Not to mention that rain makes you less visible to motorists.
And in touristy spots like Yellowstone - makes them grumpy, too.

Link - Speaking of grumpy - and Half Moon Bay - -
http://www.crazyguyonabike.com/doc/p..._id=26284&v=RI