An old wives’ tale is that you want warm days and cold nights. That came from, I believe, people who were growing wine in warm regions. They have to have a cool night if they have a warm day. But if they have a moderate day, they don’t need that cold night, because the heat that ripens the grapes also metabolizes acids, so they lose acidity.
It doesn’t get much better than sitting with someone trained in terroir and viticulture, and Dr. Mark Greenspan, of Advanced Viticulture, is as good as it gets.