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The Arizona uplands are also warm year-round, but they receive 100–300 mm (approx. 4–12") of average annual rainfall, which falls in a more regular bi-seasonal pattern. [2] According to the Köppen climate classification system, the majority of the Sonoran Desert has a hot desert climate (BWh).
Phoenix has a hot desert climate (Köppen: BWh), [1] [2] typical of the Sonoran Desert, and is the largest city in America in this climatic zone. [3] Phoenix has long, extremely hot summers and short, mild winters. The city is within one of the world's sunniest regions, with its sunshine duration comparable to the Sahara region.
Parts of Arizona located in the Sonoran Desert have warm daytime temperatures year round, while other parts of the state experience seasonal coldness regularly. The average daily temperatures of Yuma, which is located near Arizona's southwestern corner, range from 43 to 67 °F (6 to 19 °C) in January, and from 81 to 107 °F (27 to 42 °C) in July.
Mean annual rainfall, most of which occurs between September and December, is 73 mm (2.9 in) at Puerto Peñasco, Sonora (located at the southeastern margin of the sand sea on the Gulf of California) and decreases northward toward Yuma, Arizona (on the northwestern edge) to 62 mm (2.4 in) per year. [7]
Sonoran Desert. Meteor Crater. ... Arizona has an average annual rainfall of 12.7 in ... For comparison, the same month's average in Death Valley is 115 °F (46 °C ...
Tucson has a hot desert climate (Köppen BWh), with two major seasons, a hot summer and mild winter. Tucson averages 10.61 inches (269.5 mm) of precipitation per year, concentrated during the Pacific storms of winter and the North American Monsoon of summer. Fall and spring tend to be sunny and dry. [67]
Moderate rain describes rainfall with a precipitation rate of between 2.6 millimetres (0.10 in) and 7.6 millimetres (0.30 in) per hour. Heavy rain describes rainfall with a precipitation rate above 7.6 millimetres (0.30 in) per hour, and violent rain has a rate more than 50 millimetres (2.0 in) per hour. [11]
The average annual rainfall for the island is 86 inches (2,200 mm). [74] There is a distinct dry season from January to June, and a rainy season from July to December. [75] Typhoons frequent the island, which can lead to excessive rainfall. During El Niño years, dry season precipitation averages below normal.