A woman died this month after being bitten by a snake three times as she was taking a walk on rural property in the unincorporated Mendocino County community of Redwood Valley, officials say. The 78-year-old Northern California woman is the third person to die in California during an erratic snake season. On average, five people die nationwide from venomous snakebites annually, according to federal health officials. An unseasonable weather pattern that included heavy rain and sweltering heat served as a signal for rattlesnakes to slither out of their underground winter burrows in search of food and mates. The warmer temperatures also spurred the state’s residents to head outdoors. When they hit the trails, it increased their chances of run-ins with snakes. Although the Mendocino County Sheriff’s Office did not provide information on the species of snake that caused the woman’s death, rattlesnakes are the only venomous snakes in the county, according to the county’s Resource Conservation District. Rattlesnake activity began in earnest in March, a month ahead of the start of the peak season, which …