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Moab is just south of the Colorado River, at an elevation of 4,025 feet (1,227 m) on the Colorado Plateau. It is 18 miles (29 km) west of the Utah/Colorado state line. The entrance to Arches National Park is 4 miles (6 km) north of Moab on US 191.
Moab has a semi-arid climate bordering on arid characterized by hot summers and chilly winters, with precipitation evenly spread over the year (usually less than one inch per month). There are an average of 41 days with temperatures reaching 100 °F (38 °C), 109 days reaching 90 °F (32 °C), and 3.6 days per winter where the temperature remains at or below freezing. The highest temperature was 114 °F (46 °C) on July 7, 1989. The lowest temperature was −24 °F (−31 °C) on January 22, 1930.
Average annual precipitation in Moab is 9.02 inches (229 mm). There are an average of 55 days annually with measurable precipitation. The wettest year was 1983 with 16.42 inches (417 mm) and the driest year was 1898 with 4.32 inches (110 mm). The most precipitation in one month was 6.63 inches (168 mm) in July 1918. The most precipitation in 24 hours was 2.77 in (70 mm) on July 23, 1983.
Average seasonal snowfall for 1981–2011 is 6.9 inches (18 cm). The most snow in a season was 74 in (190 cm) during 1914–15, and the snowiest month on average is December, with the record set in 1915 at 46.0 in (117 cm)
Geology | Arches National Park
The Colorado River and Green River combine within the park, dividing it into three districts called the Island in the Sky, the Needles, and the Maze. The Colorado River flows through Cataract Canyon below its confluence with the Green River.
The Island in the Sky district is a broad and level mesa in the northern section of the park, between the Colorado and Green rivers. The district has many viewpoints overlooking the White Rim, a sandstone bench 1,200 feet (366 m) below the Island, and the rivers, which are another 1,000 feet (305 m) below the White Rim.
The Needles district is located south of the Island in the Sky, on the east side of the Colorado River. The district is named for the red and white banded rock pinnacles which are a major feature of the area. Various other naturally sculpted rock formations are also within this district, including grabens, potholes, and arches. Unlike Arches National Park, where many arches are accessible by short to moderate hikes, most of the arches in the Needles district lie in backcountry canyons, requiring long hikes or four-wheel drive trips to reach them.
The Ancestral Puebloans inhabited this area and some of their stone and mud dwellings are well-preserved, although the items and tools they used were mostly removed by looters.[12] The Ancestral Puebloans also created rock art in the form of petroglyphs, most notably on Newspaper Rock along the Needles access road.
The Chocolate Drops buttes from inside the Maze
The Maze district is located west of the Colorado and Green rivers. The Maze is the least accessible section of the park, and one of the most remote and inaccessible areas of the United States.[13][14]
A geographically detached section of the park located north of the Maze district, Horseshoe Canyon contains panels of rock art made by hunter-gatherers from the Late Archaic Period (2000-1000 BC) pre-dating the Ancestral Puebloans.[15][16][17] Originally called Barrier Canyon, Horseshoe’s artifacts, dwellings, pictographs, and murals are some of the oldest in America.[16] The images depicting horses date from after 1540 AD, when the Spanish reintroduced horses to America.[16]
Since the 1950s, scientists have been studying an area of 200 acres (81 ha) completely surrounded by cliffs. The cliffs have prevented cattle from ever grazing on the area’s 62 acres (25 ha) of grassland. According to the scientists, the site may contain the largest undisturbed grassland in the Four Corners region. Studies have continued biannually since the mid-1990s. The area has been closed to the public since 1993 to maintain the nearly pristine environment.
Geology | Canyonlands National Park
The Colorado River and Green River combine within the park, dividing it into three districts called the Island in the Sky, the Needles, and the Maze. The Colorado River flows through Cataract Canyon below its confluence with the Green River.
The Island in the Sky district is a broad and level mesa in the northern section of the park, between the Colorado and Green rivers. The district has many viewpoints overlooking the White Rim, a sandstone bench 1,200 feet (366 m) below the Island, and the rivers, which are another 1,000 feet (305 m) below the White Rim.
The Needles district is located south of the Island in the Sky, on the east side of the Colorado River. The district is named for the red and white banded rock pinnacles which are a major feature of the area. Various other naturally sculpted rock formations are also within this district, including grabens, potholes, and arches. Unlike Arches National Park, where many arches are accessible by short to moderate hikes, most of the arches in the Needles district lie in backcountry canyons, requiring long hikes or four-wheel drive trips to reach them.
The Ancestral Puebloans inhabited this area and some of their stone and mud dwellings are well-preserved, although the items and tools they used were mostly removed by looters.[12] The Ancestral Puebloans also created rock art in the form of petroglyphs, most notably on Newspaper Rock along the Needles access road.
The Chocolate Drops buttes from inside the Maze
The Maze district is located west of the Colorado and Green rivers. The Maze is the least accessible section of the park, and one of the most remote and inaccessible areas of the United States.[13][14]
A geographically detached section of the park located north of the Maze district, Horseshoe Canyon contains panels of rock art made by hunter-gatherers from the Late Archaic Period (2000-1000 BC) pre-dating the Ancestral Puebloans.[15][16][17] Originally called Barrier Canyon, Horseshoe’s artifacts, dwellings, pictographs, and murals are some of the oldest in America.[16] The images depicting horses date from after 1540 AD, when the Spanish reintroduced horses to America.[16]
Since the 1950s, scientists have been studying an area of 200 acres (81 ha) completely surrounded by cliffs. The cliffs have prevented cattle from ever grazing on the area’s 62 acres (25 ha) of grassland. According to the scientists, the site may contain the largest undisturbed grassland in the Four Corners region. Studies have continued biannually since the mid-1990s. The area has been closed to the public since 1993 to maintain the nearly pristine environment.