LOS ANGELES - Cooler temperatures will bring some relief to firefighters battling California wildfires, but not until later in the week, the National Weather Service said. Elsewhere in Northern California, the County Fire has charred 35,764 hectares in sparsely populated wooded areas of Napa and Yolo Counties. Some 3,660 firefighters faced with inaccessible terrain, high temperatures and low humidity, were battling the fire, which was only 48 percent contained. The blaze has burned about 19, 400 hectares and destroyed 90 structures, including homes, cabins, sheds and garages, since starting Sunday in the mountains. In Colorado, firefighters took advantage of occasional rainstorms to extend their containment lines at several large wildfires.