June 18, 2012 · 10:43 pm
For the first time this spring I woke up to fog this morning – not clouds – fog. I thought of all the lovely people visiting Napa Valley waking up, looking out the window of their hotel, and feeling a little bummed. I could just hear them saying “Darn! It’s going to be cloudy and cold today! Is it going to rain?”
I wished I could somehow tell them all not to despair. But, at least their disappointment was short-lived. By the time they had breakfast and hopped in the car for their 10:00 winery appointment things were already starting to break up. They thought “Maybe things are looking up.” By 10:30, or so, we had full sun.
And, I was thinking “Yay! We’re moving into our summer weather pattern!” It’s made up of mostly cool, foggy nights and bright, sunny days. Very comfortable for the visitors and the vines.
Why am I prattling on about this? Because, when it comes to climate, the fog is really the key reason Napa Valley is a famous winegrowing region. Without San Pablo Bay, down there at the southern end of the valley, it would be too hot, here, to grow good wine. The warm days encourage maturation. The foggy nights keep the progress kind of leisurely and the cool temperatures also keep the acidity bright. Continue reading →