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The ENSO cycle has a huge effect on rainfall and snowfall patterns in California, especially during the winter and spring seasons. During the El Niño phase, the jet stream is located south through California, allowing for warmer temperatures and more heavy rains to occur, particularly in the southern portions of the state.
The climate in the area varies drastically throughout the year. Spring in the area is warm and mild, starting in March and ending in May. Temperatures generally reach the high 60s (in March). April-Mays highs reach the 70s and 80s, and nightly lows can still be in the mid 30s (in April), although the average low is 45 to 50 °F (7 to 10 °C).
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".
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An approaching storm system is expected to bring cold and wet conditions to Southern California this week after an unseasonably warm Christmas weekend.
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Summers are warm to hot, and nearly completely dry. The summer temperature pattern usually begins in late June or early July, and lasts through September or October, although it may start as early as late May. In August, the average high/low at the University of Southern California downtown campus are 84.8 °F (29.3 °C) and 65.6 °F (18.7 °C).
On October 20, 2011, the National Oceanic and Atmospheric Administration's Climate Prediction Center issued its U.S. Winter Outlook. The outlook expected the present La Niña to persist and intensify into the winter, resulting in drier than normal conditions in the drought-stricken states of New Mexico, Oklahoma, Texas, and parts of adjacent states.