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The tundra is very much like a desert in terms of precipitation. Yearly average precipitation varies by region, but generally, there is only about 6–10 inches (150–250 mm) of precipitation per year, and in some regions, it can have up to 20 inches (510 mm). This precipitation usually falls in the form of light, fluffy snow.
August is the wettest month (0.93 in (24 mm)), while June is the driest (0.02 in (0.51 mm)). On September 8, 2014, the city of Phoenix recorded its single highest rainfall total by the National Weather Service with 3.30 in (84 mm), breaking the 75-year-old record of 2.91 in (74 mm), set on September 4, 1939. [19]
Climate data for Phoenix Int'l, Arizona (1991–2020 normals, [a] extremes 1895–present) [b]; Month Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Year Record high °F (°C)
The average annual precipitation in the subalpine forest is 30 to 40 inches (760 to 1,020 mm). Alpine tundra – The San Francisco Peaks are the home of the only alpine tundra environment in Arizona, occupying 1,200 acres (4.9 km 2 ) above 10,600 feet (3,200 m).
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The tundra climate is a polar climate sub-type located in high latitudes and high mountains. It is classified as ET according to the Köppen climate classification. It is a climate which at least one month has an average temperature high enough to melt snow (0 °C [32 °F]), but no month with an average temperature in excess of 10 °C (50 °F ...
Tundra tends to be windy, with winds often blowing upwards of 50–100 km/h (30–60 mph). However, it is desert-like, with only about 150–250 mm (6–10 in) of precipitation falling per year (the summer is typically the season of maximum precipitation). Although precipitation is light, evaporation is also relatively minimal.
Over the contiguous United States, total annual precipitation increased at an average rate of 6.1 percent per century since 1900, with the greatest increases within the East North Central climate region (11.6 percent per century) and the South (11.1 percent). Hawaii was the only region to show a decrease (−9.25 percent). [89]