I have a fabulous navy sweater that’s cozy, comfy, stylish, and wearing it, to adapt a line from Marie Kondo, brings me true joy.   I wasn’t going to buy it; I really didn’t need another sweater. But on my very first trip to California wine country, way back in June of 2009, I was under-prepared for the cool mornings and evenings that bookend gloriously hot, blue-sky filled days.   Yes, I had learned about this so-called “diurnal shift” – a large temperature swing from chilly nights to blazing days – that contributes generously to the stunning wines…