Mitras (Mountain of the Mitres), which resemble the profile of several bishops with their mitres. Cerro de la Silla (Saddle Mountain) dominates the view at the east of the city and is considered a major symbol of the city. Cerro de la Loma Larga—South of the Santa Catarina river—separates Monterrey from the suburb of San Pedro Garza García. At the summit of the Cerro del Obispado, north of the river, is the historic Bishopric Palace, site of one of the most important battles of the Mexican–American War. Natural areas The mountains surrounding Monterrey contain many canyons, trails and roads that cross deserts and forests and suitable trails are available to the general public. The Sierra Madre Oriental mountains south of the city are included in the "Parque Nacional Cumbres de Monterrey" (National Park), which was added to UNESCO's Man and the Biosphere (MAB) Program of Biosphere Reserves in 2006. Cumbres de Monterrey includes: Parque Ecológico Chipinque, which contains forested areas (oak and oak-pine mainly). La Estanzuela state park, about south of Monterrey, a river and forested area. La Huasteca, west of the city, in the municipality of Santa Catarina. El Potrero Chico Climbing Area, north east of the city, in the municipality of Hidalgo. Garcia Caves – these caves are situated in Garcia, Nuevo Leon and were discovered in 1843. Inside you can see amazing stalagmites formations and snail fossils. Matacanes – can be found in the municipality of Potrero Redondo in Santiago, Nuevo Leon. It is a 10 hrs walking tour in which you can find rappel descents, underground rivers, waterfalls, among other obstacles. Hydrophobia Canyon – similar to Matacanes with the only difference this is a 100% aquatic area. Cascade Cola de Caballo – a spectacular waterfall in Santiago Nuevo Leon, formed by water that runs down from the mountains of nearby Parque Nacional Cumbres de Monterrey, impressive rock formations and sprawling forests. Climate Monterrey has a semi-arid climate (Köppen climate classification BSh). Being inland at a modest elevation, it is one of the warmest major cities in Mexico. Summers are generally hot, spring and fall temperate, and winters mild, with temperatures rarely below freezing. The average high in August is and the average low is . The average January high is and the average low in January is . Rainfall is scarce in winter, but more frequent during May through September. Monterrey frequently experiences extreme weather changes;