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Bel-Air had a peak 24-hour rainfall of 12.42 inches (315 mm) which equates to a 380-year return interval (0.3%).Los Angeles had been incorporating elements of a stormwater harvesting design to retain the rainwater. From February 4 to 7, the city captured 8.6 billion gallons of water, equivalent to the yearly needs of 106,000 homes. [29]
Napa, north of San Francisco, recorded its worst flood to this time [29] while nearby Calistoga recorded 29 inches (740 mm) of rain in 10 days, creating a once-in-a-thousand-year rainfall event. [27] Records for 24-hour rain events were reported in the Central Valley and in the Sierra. Thousand-year rainfalls were recorded in the Sierras. [1]
Total precipitation of affected areas from December 26, 2022 to January 11, 2023 [94] State Location Amount California: San Francisco: 13.59 inches (34.5 cm) California: Oakland: 12.90 inches (32.8 cm) California: Santa Barbara: 12.10 inches (30.7 cm) California: San Francisco International Airport: 11.59 inches (29.4 cm) California: Napa: 11. ...
The mountainous areas will pick up even more rainfall due to terrain enhancement to the totals. A widespread 6 to 12 inches will be possible in these locales, with locally higher amounts up to 15 ...
Last winter, from Dec.1, 2022, to Feb. 28, 2023, rainfall totals in Santa Barbara came out to 165% compared to historical averages, while Los Angeles ended the season with 188% of normal rainfall.
The prediction center cautioned at least 8 inches of rain is possible in less than 24 hours for portions of the Transverse Ranges in Southern California, with maximum totals just over 10 inches ...
Climate data for San Francisco ... Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Year Record high °F (°C) ... Average precipitation inches (mm) 4.40 (112) ...
Although California has always had extreme daily, monthly, and annual variations in rainfall, the state's precipitation patterns have become increasingly variable over time, trending towards a drier climate as a result of global warming. [117] Among all of the effects of climate change, changes in precipitation will be the hardest to predict.