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The desert region of California is characterized by low rainfall, caused by the rain shadow of mountain ranges to the west of the desert region. The Mojave Desert receives from 3 to 10 inches (76 to 254 mm) of rain per year, while the Colorado Desert receives from 2 to 6 inches (51 to 152 mm). [10]
Northwestern California has a temperate climate with rainfall of 15 inches (380 mm) to 50 inches (1,300 mm) per year. Some areas of Coast Redwood forest receive over 100 inches (2,500 mm) of precipitation per year. The Central Valley has a wide range of precipitation.
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]
Snowmelt is also the primary water source for the Colorado River which supplies southern California. Annual precipitation in California is highly variable, with a statewide average of 22.9 inches (58.2 cm) of precipitation per year. [19]
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California's fire crisis stems from outdated water systems and poor forestry management, critics argue, with progressive politics thwarting realistic solutions.
Although this region is a desert, with high temperatures and low average rainfall of 3 inches (76 mm) per year, [9] the economy is strongly based on agriculture. This is supported by irrigation, with water supplied wholly from the Colorado River via the All-American Canal. [10]
San Francisco, with a historical February rainfall average of 3.96 inches, is forecast to get up to 4 inches. Redding averages 5.48 inches in February but could see 4-8 inches by Wednesday ...