Well, the only reference I could find to rain at this point in The Hitch Hikers Guide to the Galaxy is to the song that Eddie is singing as the missiles from Magrathea are heading towards the spaceship Heart of Gold. [chapter 17 - and very hard to find it was!] I'm sure everyone knows the song You'll Never Walk Alone that begins "When you walk through a storm hold your head up high and don't be afraid of the dark;" well
'''Walk on through the rain...' sang Eddie." I think the song originally comes from the musical Carousel but I like the version by Gerry and the Pacemakers. There's an Elvis version too if you are that way inclined.
The rain word did make me think of the Rain God in the Hitchhiker's series - the rain likes this man so much it is always raining on him and he knows every different type of rain there is - but that doesn't come until the third book of the 'trilogy'.
Now my inchies - the first is your generic drawing of rain.
I quilled two rain inchies - the first is what is at the end of the rain - a rainbow
and it may be hard to make out but this is an umbrella with rain falling on it.
In Southern Ontario where I live we have had very little rain this past few weeks - the grass is yellow and there is a fire ban on. So even though I hate getting wet, I'm hoping for a little rain soon.