Here is a 3 minute 24 bit stereo 44.1 kHz wave sample of rain. Slight variations in how hard it rains in this sample, also a few birds tweeting in the background too.

You can get an idea of the sample via this mp3 download, its 3 MB in size

To download the 24 bit sample archive CLICK HERE (40 MB)

This work is licensed under a 

Creative Commons Attribution-NonCommercial-ShareAlike 2.0 England & Wales License.