Someone one another forum recently posted a link relating to rain
gauge accuracy issues:

http://tinyurl.com/zhfw8

(NB This is a link directly to a PDF document so it may be better -
depending on your news reader - to download the file and then open it
in Acrobat rather than trying to open it directly.)

None of the discussion will be new to anyone familiar with rain gauge
use, but it's quite a handy and readable summary of the topic.

John Dann
www.weatherstations.co.uk