Organ Pipe Cactus National Monument
Climate and Map
Organ Pipe Cactus National Monument is located along the Mexican border in southwestern Arizona equidistant from Tucson, Phoenix and Yuma. It runs 40 to 50 miles from both east-to-west and north-to-south, encompassing some 500 square miles.
Most of the Monument is situated between the Ajo Mountain Range to the east and the Puerto Blanco Mountains to the west, with the Senita Plain extending west from here into the Cabeza Prieta National Wildlife Refuge.
Temperatures between October and April are normally 60 to 70 degrees F, but during May through September often exceed 105 degrees with humidity below 10%. Nights are considerably cooler than days throughout the year.
This region of the Sonoran Desert has two annual rainy seasons. December through March usually has gentle rains, while thunderstorms are likely during August and September, accounting for an annual average precipitation of 9.5 inches. Rain gear is recommended for park visitors during these months. Note that the late summer's rainy season is usually accompanied by temperatures in the 90's and high humidity.
At elevations ranging between 2,000 and 4,000 feet, temperatures are likely to vary greatly, especially season to season. Be prepared with sunscreen, hats and plenty of water.
From the NORTH: follow AZ Hwy 85 through Ajo and Why. The Monument is 22 miles (35.4 km) south of Why. From the EAST: follow AZ Hwy 86 to Why, then turn south on AZ Hwy 85. From the WEST: follow I-8 to Gila Bend or I-10 to Buckeye, then turn south on AZ Hwy 85. From MEXICO: drive on Mexico Route 2 to Sonoyta, then north to Lukeville.
Plane & Public Transportation
Nearest airports are in Phoenix and Tuscon, then by private vehicle. No public transportation available.
Getting Around: No rentals or public transportation available in area. Access is by foot, cycle or private vehicle. During the winter season motorized tours of the Ajo Mountain scenic drive may be offered, check at the Kris Eggle Visitor Center for information.
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