Arizona Geography

Arizona is located in the Western United States as one of the Four Corners states. Arizona is the sixth largest state in area, after New Mexico and before Nevada. Of the state's 118,000 square miles, approximately 15% is privately owned. The remaining area is government forest and park land, recreation areas and Native American reservations.

Arizona is best known for its desert landscape, which is rich in xerophyte plants such as cactus. It is also known for its climate, which presents exceptionally hot summers and mild winters. Less well known is the pine-covered high country of the Colorado Plateau in the north-central portion of the state, which contrasts with the desertic Basin and Range region in the southern portions of the state.

Like other states of the Southwest, Arizona has an abundance of topographical characteristics in addition to its desert climate. More than half of the state features mountains and plateaus and contains the largest stand of Ponderosa pine in the United States. The Mogollon Rim, a 2000-foot (600 m) escarpment, cuts across the central section of the state and marks the southwestern edge of the Colorado Plateau, where the state experienced its worst forest fire ever in 2002. Arizona belongs firmly within the Basin and Range region of North America. The region was shaped by prehistoric volcanism, followed by a cooling-off and related subsidence. The entire region is slowly sinking.

The Grand Canyon is a colorful, steep-sided gorge, carved by the Colorado River, in northern Arizona. The canyon is one of the seven natural wonders of the world and is largely contained in the Grand Canyon National Park—one of the first national parks in the United States. President Theodore Roosevelt was a major proponent of designating the Grand Canyon area, visiting on numerous occasions to hunt mountain lion and enjoy the scenery.

The Canyon was created by the Colorado River cutting a channel over millions of years, and is about 277 miles (446 km) long, ranges in width from 4 to 18 miles (6 to 29 kilometers) and attains a depth of more than 1 mile (1.6 km). Nearly 2 billion years of the Earth's history has been exposed as the Colorado River and its tributaries cut through layer after layer of sediment as the Colorado Plateaus have uplifted.

Arizona is home to one of the largest and most well-preserved meteorite impact sites in the world. The Barringer Meteorite Crater (better known simply as "Meteor Crater") is a gigantic hole in the middle of the high plains of the Colorado Plateau, about 25 miles west of Winslow. A rim of smashed and jumbled boulders, some of them the size of small houses, rises 150 feet above the level of the surrounding plain. The crater itself is nearly a mile wide, and 570 feet deep.

Arizona does not observe Daylight Saving Time, except in the Navajo Nation, located in the northeastern region of the state.

Due to its large area and variations in elevation, the state has a wide variety of localized climate conditions. In the lower elevations, the climate is primarily desert, with mild winters and hot summers. Typically, from late fall to early spring, the weather is mild, averaging a minimum of 60 degrees Fahrenheit (15°C). November through February are the coldest months with temperatures typically ranging from 40–75 °F (4–24 °C), although occasional frosts are not uncommon. About midway through February, the temperatures start to rise again with warm days, and cool breezy nights. The summer months of May through August bring a dry heat ranging from 90–120 °F (32–48 °C), with occasional high temperatures exceeding 125 °F (52 °C) having been observed in the desert area. Due to the primarily dry climate, large temperature swings often occur between day and night, with some as large as 50 °F (28 °C) in the summer months.

However, the northern third of Arizona is a plateau at significantly higher altitudes than the lower desert, and has an appreciably cooler climate, with cold winters and mild summers. Extreme cold temperatures are not unknown; cold air systems from the northern states and Canada occasionally push into the state, bringing temperatures below 0 °F (–18 °C) to the higher parts of the state.

Arizona has an average annual rainfall of 12.7 inches (322 mm),[2] which comes during two rainy seasons, with cold fronts coming from the Pacific Ocean during the winter and a monsoon in the summer.[3] The monsoon season occurs from the middle of July through August and brings lightning, thunderstorms, wind, and torrential, if usually brief, downpours. It is rare for tornadoes and hurricanes to occur in Arizona, but there are records of both occurring.

Indicative of the variation in climate, Arizona is the state which has both the metropolitan area with the most days over 100 °F (37.8 °C) (Phoenix), and the metropolitan area in the lower 48 states with nearly the most days with a low temperature below freezing (Flagstaff) [4].

A view of an Arizona sunset looking over a lake.

Horsethief Lake near Crown King, Arizona.

The North Rim of the Grand Canyon.