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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.
During the winter season, the temperature can sometimes reach as low as −11 °C (12 °F), freezing the lake. [ 6 ] [ 9 ] The lake covers an area of 18 square kilometres (6.9 sq mi) and is part of a natural wetland which covers 21.1 square kilometres (8.1 sq mi), including its floating gardens.
This is a list of cities by average temperature (monthly and yearly). The temperatures listed are averages of the daily highs and lows. Thus, the actual daytime temperature in a given month may be considerably higher than the temperature listed here, depending on how large the difference between daily highs and lows is.
Climate Central’s “2023 Winter Package” graphic shows the average change in winter temperature between December and February, from 1970 to 2022.
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.
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The greatest rainfall in one month was 14.50 inches (368 mm) in January 1969, including a record 24-hour rainfall of 6.71 inches (170.4 mm) on January 20 that month. [ 44 ] [ 45 ] In San Fernando Valley, the highest recorded temperature was 121 °F (49 °C) on September 5, 2020. [ 35 ]
A study published in Science Advances in 2022 stated that climate-caused changes in atmospheric rivers affecting California had already doubled the likelihood of megafloods since 1920—which can involve 100 inches (250 cm) of rain and/or melted snow in the mountains per month, or 25 to 34 feet (7.6 to 10.4 m) of snow in the Sierra Nevada—and ...