After requesting MetO rainfall cards for several stations for February 1991 I've been surprised how much the precipitation varied over quite a small area.

There was 23mm - 27mm over a wide area though some stations seem to have recorded far less. Which brings me to a question. Is it a case of stations missing out or is it down to the skills of the observer in recording snow? How meticulous was the Met Office's quality control in 1991? Were volunteers trained?

The rainfall card for City of London Cemetery also does not agree with the digitised data I was sent last year.

Here is a link to the excel spreadsheet

http://1drv.ms/18ymJMm