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Average annual precipitation Percent Area in U.S. Drought Monitor Categories. The prevailing westerly winds from the oceans also bring moisture, and the northern parts of the state generally receive higher annual rainfall amounts than the south. California's mountain ranges influence the climate as well: moisture-laden air from the west cools ...
Annual precipitation in California is highly variable, with a statewide average of 22.9 inches (58.2 cm) of precipitation per year. [19] However, recorded precipitation totals can fluctuate heavily from year to year because of atmospheric conditions and climate change.
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]
While some measurements suggest the 2015-2016 El Niño was the strongest on record since 1950, [29] Southern California received below average precipitation contrary to what the Climate Prediction Center predicted leading up to the winter months. [31]
California is in desperate need of moisture in the form of rain and mountain snow. Since the water year began on Oct. 1, 2020, most areas are within the 25th to 50th percentile of average. Even ...
Water flows in the Los Angeles River, next to the 5 Freeway, on Friday. Northern California is near or above average precipitation, while Southern California is below average levels.
On average, San Diego sees 21 days with some precipitation while the rest of the country sees about 110. The national average for mostly sunny days is 213 while San Diego's is 267. San Diego's annual snowfall is 0 inches per year while the nation usually sees an average of 24.2 inches (610 mm) per year.
Historically, El Niño conditions were present during sixteen winters between 1951 and 2015. Six of those had below-average rainfall, five had average rainfall, and five had above-average rainfall. However, as of May 2015, drought conditions had worsened and above average ocean temperatures had not resulted in large storms. [30]