Comment by gensym

Dry can be good for wines - apparently, a little stress causes plants to produce more fruit (I guess the intuition is that if the plant thinks it might die, it's time to try to reproduce), and water in particular can dilute the flavors of the grape. A winemaker friend of mine was complaining when we get rain here right before harvest time a month or so ago because it's going to lead to a lower quality year.