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Average annual rainfall is 38.58 inches (980 mm) with measurable precipitation falling on an average of 65.7 days each year. The wettest year was 1983 with 75.38 inches (1,915 mm) and the driest year was 2013 with 6.45 inches (164 mm). The most rainfall in one month was 32.06 inches (814 mm) in February 1986.
There are an average of 54.6 days with highs of 90 °F (32 °C) or higher and an average of 13.8 days with lows of 32 °F (0 °C) or lower. The record high temperature was 115 °F (46 °C) on July 13, 1972, and the record low temperature was 11 °F (−12 °C) on December 11, 1932. Average annual precipitation is 33.97 inches (863 mm).
Average annual rainfall ranges from 40 inches (1,016 mm) per year at Howell Mountain in the north, to 30 inches (762 mm) per year at Mt. George, to 20 inches (508 mm) per year at Benicia in the south. Rainfall is similar on both the west and east sides of the range, with no noticeable rain shadow effect.
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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 ...
As sunlight spilled into California's famed Napa Valley on a summer day, rows of wine grapes reflected the benefits of this winter's record rainfall. California has more than 960 square miles ...
The wettest year was 1983 with 88.89 inches (2,258 mm) and the driest year was 2020 with 16.28 inches (414 mm). The most precipitation in one month was 40.81 inches (1,037 mm) in January 2017. The most precipitation in 24 hours was 10.48 inches (266 mm) on October 24, 2021. Average annual snowfall is 2.0 inches (5.1 cm).
California: Region(s) Napa County, ... -long Central Valley of California. ... Mean rainfall averages 25 to 30 inches (635 to 762 mm) a year, with nearly all rain ...