Witam.
Zgodnie z tym co piszę w FAQ Cumulusa:
"Cumulus deliberately doesn’t attempt to download any data from before the point when you first run it. If you wish, although this isn't recommended, you can force it to download data from any point by editing the ‘Timestamp’ line in the today.ini file (in the data folder), before starting it (you will need to have run it at least once previously). If you do this, you will probably need to edit your data files as you may have duplicate entries and/or entries out of order. Your rain totals will almost certainly also be wrong - the total for "today" in particular. See the FAQ entry about correcting rainfall data. "
Chodzi o to, że jeśli zainstalowałeś Cumulusa to on nie będzie pobierał starszych danych. Jeśli chcesz aby pobrał, musisz zmienić odpowiednią linię w pliku i wtedy to ściągnie.
Pozdrawiam,
Błażej.