the rest of the city. The percentage of married people was among the county's highest. The rate of 10% of families headed by single parents was low for the city. Geography Chatsworth is flanked by the Santa Susana Mountains on the north, Porter Ranch and Northridge on the east, Winnetka, Canoga Park, West Hills on the south, the Simi Hills, and unincorporated Los Angeles County and Ventura County on the west, and Twin Lakes, a community founded by San Francisco's George Haight in the early 20th century and unincorporated Los Angeles County which includes a 1,600 acre park with equestrian trails, to the north. Climate This region experiences hot and dry summers, with average daily high temperatures of 90–100 °F. According to the Köppen Climate Classification system, Chatsworth has a warm-summer Mediterranean climate, abbreviated "Csb" on climate maps. History Native Americans Chatsworth was inhabited by the Tongva-Fernandeño, Chumash-Venturaño, and Tataviam-Fernandeño Native American tribes. Native American civilizations inhabited the Valley for an estimated 8,000 years. Stoney Point is the site of the Tongva Native American settlement of Asha'awanga or Momonga, which was also a trading place with the neighboring Tataviam and Chumash people. The nearby Burro Flats Painted Cave remains a legacy of the Chumash culture's rock art and solstice ceremony spirituality. Spain and Mexico The first European explorers came into the Chatsworth area on August 5, 1769, led by the Spanish military leader Gaspar de Portolà. With its establishment in 1797 and subsequent Spanish Land Grant by the King of Spain, Mission San Fernando (Mission San Fernando Rey de España) gained dominion over the San Fernando Valley's lands, including future Chatsworth. The Native American trail that had existed from the Tongva-Tatavium village called rancheria Santa Susana (Chatsworth) to another village, replaced by Mission San Fernando, became the route for missionaries and other Spanish travel up and down California. It was part of the El Camino del Santa Susana y Simi trail that connected the Valley's Mission, Los Angeles pueblo (town), and the southern missions with the Mission San Buenaventura, the Presidio of Monterey, and the northward missions. The trail crossed over the Santa Susana Pass to the Simi Valley, through present day city park Chatsworth Park South and the Santa Susana Pass State Historic Park. In 1795, the Spanish land grant had been issued for Rancho Simi, reconfirmed in 1842 by the Mexican governor. Its lands included part of current