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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.
Köppen climate types of California, using 1991–2020 climate normals. Golden Gate Bridge in fog Snow in the mountains of Southern California Summer in the Sierra Nevada at Lake Tahoe High precipitation in 2005 caused an ephemeral lake in the Badwater Basin of Death Valley.
The Santa Anas are katabatic winds (Greek for "flowing downhill") arising in higher altitudes and blowing down towards sea level. [7] The National Weather Service defines Santa Ana winds as "a weather condition [in southern California] in which strong, hot, dust-bearing winds descend to the Pacific Coast around Los Angeles from inland desert regions".
Increased rainfall is expected across much of California through the rest of December, with rains beginning as early as Sunday in the Los Angeles area.
The first winter outlook from the National Oceanic and Atmospheric Administration predicts that a strong El Niño will remain in place through at least the spring, bringing warm, wet conditions to ...
For decades, El Niño seemed synonymous with wet winters for Southern California, while La Niña was a heralder of drought. But the would-be model didn't hold up this winter.
Southern California had become increasingly arid since late summer 2024, with storm systems predominantly affecting the Pacific Northwest and Northern California instead, as a result of the El Niño–Southern Oscillation (ENSO) shifting from El Niño to La Niña. La Niña conditions had emerged over the tropical Pacific Ocean by December 2024.
This marks October as fire season for San Diego and the rest of Southern California due to low precipitation and sporadic heat waves that the average monthly temperatures do not immediately show. For example, the months with the highest record high temperatures are September at 111 °F (44 °C) and October at 107 °F (42 °C).