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Too much rain and lack of sunlight encourage juice formation. The grapes are mature but not fully, the sugar content is low and the wrong kind of acid (malic acid) is high.
The result is often insufficient degree of alcohol and a pale color in red wine. The wine is thin, sour, with no balance and short-lived.
If, during the vinification done anything to increase the sugar content artificially and to stabilize the wine, it can be converted into an acceptable drink, but never is a fine plant of it.
These are the minimum climatic requirements of the vine:
1300 hours of sunshine per year
an average minimum temperature of 15 degrees Celsius during the flowering and 18 ° C during the growing season
annual rainfall of at least 400 to 500 mm / m
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