Wendel is an unincorporated community in Lassen County, California. It is located 23 miles east-southeast of Susanville, at an elevation of 4012 feet. Wendel's ZIP Code is 96136.The Wendel post office opened in 1915, closed in 1920, and re-opened in 1921. The name Wendel was bestowed by Thomas Moran, the president of the Nevada?California?Oregon Railway, for a friend.This region experiences warm and dry summers, with no average monthly temperatures above 71.6F. According to the Kppen Climate Classification system, Wendel has a warm-summer Mediterranean climate, abbreviated "Csb" on climate maps.