The Sonny Bono Salton Sea National Wildlife Refuge is at the southern end of the Salton Sea in Imperial Valley, California, 40 miles (64 km) north of the Mexican border. Situated along the Pacific Flyway, the Refuge is the only one of its kind, located 227 feet (69 m) below sea level. Because of its southern latitude, elevation and location in the Colorado Desert, the Refuge experiences some of the highest temperatures in the nation. Daily temperatures from May to October generally exceed 100 °F with temperatures of 116°–120 °F recorded yearly.