December to march, is the moment during which the vines are pruned : if you leave all of the growth from the previous year it will have buds on it, which means you'll have a huge crop the following year..As the vine can't produce enough energy to ripen an unregulated crop, it'll be poor quality.

After the appearance of buds, then flowering… the seeds begin to color; they ripen (July, August), then enter the period of maturation (August, September) during which they fill with sugar and lose their acidity, which is measured by simple analytic tests.

It's time for harvest; we are in september…

Grapes are harvested "by hand" all day long and are used for "carbonic maceration" a winemaking technique, often associated with the French wine region of Beaujolais, in which whole grapes are fermented in a carbon dioxide rich environment prior to crushing

Early in the morning, grapes are harvested with the machine; transported to the winery, the grapes are removed from the stems and sent to the vats.
(Continue > > From grapes to Wine: 2nd)