As reported by Gilberto Boniperti from the Fara appellation in Northern Piedmont:
"There are two characteristics that distinguish the 2013 vintage in northern Piedmont: unfavorable temperature and rainfall, and the resulting late harvest.
The rainstorms in April and May favored, despite low temperatures, attacks of peronospora (downy mildew), and the availability of water and consequent vegetative vigor after fruit set encouraged the onset of oidium (powdery mildew), but the amount of damage was manageable. The phenological phases of the vines followed one another with delayed growth of the shoots until veraison, which they completed only in the second half of August.
Excellent weather during the first three weeks of September allowed the ripening to catch up substantially. Then overcast weather at the very end of September and the beginning of October delayed full maturity. Finally the harvest began in mid-October, and the hard work in the vineyard that years like this require gave us average levels of sugar and acidity.
To conclude, the slow ripening during 2013 allowed us in the end to make wines of finesse and complexity, comparable with the best vintages."
(Photo of grapes above was taken during a visit to Boniperti in September 2013)