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East Los Angeles, the Gateway Cities, and parts of the San Gabriel Valley average the warmest winter high temps (72 °F, 22 °C) in all of the western U.S., and Santa Monica averages the warmest winter lows (52 °F, 11 °C) in all of the western U.S. Palm Springs, a city in the Coachella Valley, averages high/low/mean temperatures of 75 °F/50 ...
The record high temperature at the National Weather Service office in San Diego of 111 °F (44 °C) was on September 26, 1963. The record low temperature was 25 °F (−4 °C) on January 7, 1913. [8] The record high temperature was tied only once and happened on September 27, 2010, 47 years and two days after the set record.
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).
Climate Central’s “2023 Winter Package” graphic shows the average change in winter temperature between December and February, from 1970 to 2022.
The average high temperature is 92 °F (33 °C) in summer, and the average low is 32 °F (0 °C) in winter. Normally, July is the hottest month and December the coldest. December and January are the wettest months, with an average of 5.95 and 6.45 inches (151 and 164 mm) of rain per month, respectively. [9]
Lake Oroville, the State Water Project's largest reservoir, was at 134% of its average amount to date, but the department noted that the Northern California headwaters of the State Water Project ...
The average annual rainfall precipitation is 30.66 inches (779 mm); January is the wettest month at 5.71 inches (145 mm) and July the driest at 0.08 inches (2 mm). [22] In 2015, Northern California experienced a drastic drought reducing the lake level to 39% capacity in January 2016.
A dry start to the water year in California could ignite drought conditions in a matter of months, climate experts warn. The state is undergoing its worst start to a water year in a decade ...