Climate effect on wine production

[Thomas]

True enough about acid dropping, but in cool climates, acids in Riesling and other late harvest-type grapes can be quite high to begin with -- between .8 and 1 percent is not uncommon. That makes for a long way down as the grapes ripen and concentrate sugars. And to slow up the acid reduction, while they concentrate sugars late harvest grapes also concentrate remaining acids in high ratio to what little juice there is.