There are good reasons why people don't like rain.
First of all, you'll run the risk of undercooling. While for short runs this isn't much of a risk, for longer runs (2 hours and longer) this might but harmful indeed.
Second, heavy rain is often accompanied by thunder. And we all (should) know how dangerous thunder can be.
This means rain is not the same as e.g. taking a shower. You can turn off the shower, but you can't turn off the rain
Rene van Belzen hurray [at] xs4all [dot] nl My Running Log