I see your solution, thanks. A litle problem is that not all "Maximes" dates are in 'Pluviometria' table.
I have try unsuccessfully to create a new table named 'Dates', make relations from 'Pluviometria' and 'Maximes' to this table, and pick 'Date' from it. But Jet don't support this kind of relations. See MultipleJoin.png.
Finally, with google refine, I reshaped data, all measures data are now in the same table (see dataReshape2.png file), the workbook is shared on this post. Be free to suggest us a nice viz with it!
I usualy work with MS OLAP database, this book is just for a teaching session. The best advantage of working with Excel is the ability to display disaggregated data. I miss this presentation using OLAP.