October’s rains put a modest dent in California’s drought, leaving the state in its best shape in more than three years, according to data released Thursday. The U.S. Drought Monitor’s weekly report showed that 12 percent of California, all in the northernmost counties, is now considered drought-free. That’s the highest percentage since March 2013. A year ago, all four counties in the Sacramento region were in “exceptional drought,” the worst classification. Most of Sacramento and Yolo counties remain in “severe drought” status.