Cool summer temperatures delayed the wine harvest in California by two weeks. Sonoma, Calif., was two to three degrees below normal in July and August. Napa, Calif., recorded June temperatures 2.5 degrees below normal, and July and August has been more than five degrees below normal. Ideally, you want warm days and cool nights for grapes to flourish. The cooler afternoon temperatures has delayed the maturation of grapes. What seems ironic is, now that it's time to harvest, the temperatures last week were 114 degrees in Sonoma and 104 degrees in Napa. The one positive, growers say, is the cooler temperatures do give grapes a better flavor and color, especially in the reds, and 2010 should have better wine all the way around.