I'm the same as Edouard, I manually log and chart various data parameters in Excel.
As a comparison I am using official UK MET Office data that online for the local (25 miles away
) offical weather station. These published records go back to 1914. At the moment I am using their data back to 1980 to give myself comparison data for average monthly TMax, TMin, TAve and rainfall totals.
We have had some exceptional rainfall earlier this year, as can be seen on the attached chart, I felt that I had set my station up wrong, but have found another station on Wunderground who is 5 miles away and who's monthly rainfall totals for March and April were within 5 mm of mine, other months its even closer.
It's never going to be an exact comparison, using the MET Office data but it gives me something to work with for the next few years until I build up my own records database.
JC