Many Tahoe-area ski resorts have closed due to low snowfall as California’s historic drought continues. (Max Whittaker/Getty Images) Researchers knew California’s drought was already a record breaker when they set out to find its exact place in history, but they were surprised by what they discovered: It has been 500 years since what is now the Golden State has been this dry. California is in the fourth year of a severe drought with temperatures so high and precipitation so low that rain and snow evaporate almost as soon as it hits the ground. A research paper released Monday said an analysis of blue oak tree rings in the state’s Central Valley showed that the amount of mountain snow California relies on for moisture hasn’t been so low since the 1500s. That was around the time when […]