I found some useful information on the characteristics of the individual droplets, their shape and how they fall.
(From Wikipedia)
At sea level providing there is no wind.:
0.5 mm drizzle impacts at 2m/s
5 mm drops impact at 9m/s
As you can see the raindrops here are very different to how they usually look in photographs, their "tail" is a lot less apparent. I think this is partly due to the fact that during a rainstorm there would be very strong winds that would blow out the tail of a raindrop (very similar to how comets and solar winds work). Another factor I feel would be the cameras not quite being able to keep up with the speed and amount of rain falling, and creating a kind of "motion blur" effect.
Some reference images of rain taken from far away aswell as close up. Ideally I would like to shoot my own footage aswell but I shall need to wait for a rainy day to do that.
I found this video aswell which is a good reference for rain, however it does not look like there is much wind in this video.
Some beautiful reference for lightning (not sure I will do lightning as an effect, I want to focus on rain for now)
This is good reference for water as a material, as I will have to recreate the effect including materials.
The next step is to start building up a basic raindrop effect to start with.
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