![]() Note, monthly data is collected during the first week of the following month and will be posted to this webpage when received from the National Weather Service cooperative observers. In addition the percent of normal will not be calculated. If a station has any missing data, it's WY to Date total will also be missing. NA means that 30 year averages do not exist for this station. Precipitation data is provided for each month of the most recent water year, total precipitation for the water year, the percent of normal for the water year to date, and the percent of the entire water year we have received to date. The water year starts on October 1 of the previous reference year and ends on September 30 of the reference year. The following is data from National Weather Service cooperative observers as of the end of last month. Above-normal potential wraps southward from there toward the Tehachapi Mountains through the coastal ranges and the central and southern Sierra Nevada.Monthly Precipitation Summary Water Year 2023 The National Interagency Fire Center’s outlook for July calls for above-normal potential for wildfire north of the Interstate 80 corridor. This missing year of rainfall contributes to the drought and a tinder-dry environment that is much more prone to wildfire. Santa Rosa ended up with only 55% of its three-year normal. ![]() They ended up with 43% and 45% of their three-year normals, respectively, because they were north of the December atmospheric river and too far south for storms that wet down the far northwestern corner of the state, according to Null. Places such as Ukiah and Mount Shasta City, for example, weren’t as lucky. San Francisco, for example, ended the 2021-2022 rainfall season with 82% of normal, but for the three-season period ending June 30, it had only 56% of normal. But even within that target area, precipitation numbers came up short. According to Null, a strong atmospheric river in December doused the state from about Monterey to just north of the Golden Gate, and from about Yosemite to Oroville. These watersheds include the Sacramento, Feather, Yuba and American rivers, which provide a large portion of the state’s water supply.ĭecember was unusually wet and snowy in the state, but then the spigots were shut off for the next couple of months, which are usually the wettest. The index is the average of eight precipitation-measuring sites that provide a representative sample of the northern Sierra’s major watersheds. What he called the “bellwether” stood at 61% of normal for 2019 through 2022, less than two-thirds of what would be expected. If he could pick a single number to characterize the state’s water situation, Null said, it would be the Northern Sierra 8-Station Index. ![]() Rainwater and snowmelt are captured there in huge reservoirs such as Shasta Lake and Lake Oroville. Most of California’s significant precipitation occurs in the north. But precipitation in the northern part of the state is much more consequential for Southern California and the Golden State’s elaborate plumbing system than what falls south of the Tehachapi Mountains. Places in Southern California fared better, with downtown Los Angeles getting 77% of normal rainfall for the three-year period, and San Diego coming in at 85%.
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