Hi All,
I though I had put this link up somewhere but I can't find it now so I've given it its own thread.
This is the CWOP (Citizen Weather Observer Program) Station Siting, Performance and Data Quality Guide.
It's a PDF file that give some good information about where to site your sensors and is a good guide to achieving good data quality.
http://home.comcast.net/~dshelms/CWOP_Guide.pdf
I found it handy when I first set up my own station and it uses the basic rules that the UKMO also use for the their sensors.
Martin.