The Impact of Wildfire Smoke on California Raisins Temperature of raisin grapes drying on trays (left) and on the vine (right) near Fresno, CA. Ambient temperature was about 92°F at the time temperature measurements were made. Relatively low temperatures were due to lack of sunlight caused by wildfire smoke. Photos by Stephen Vasquez, SUN-MAID The ongoing international COVID-19 pandemic has disrupted everyone’s life and work, and when most people think of 2020, the pandemic will be top-of-mind. However, when many Californians, including some grape growers, think of 2020, wildfires will als...