![]() ![]() Precipitation normals were generally wetter east of the Rockies, and drier in the central and southern West. to varying degrees, most distinctly in April. Overall, the central month of each season displayed cooling normals in the north-central U.S. The East was warm and displayed alternating zones of wetter and drier conditions that were reminiscent of shifting storm tracks. The rest of the country was consistently warmer, but the southwest and south-central U.S. marked both wetter and cooler normals for 1991–2020 than 1981–2010. Monthly gridded climate normals are available for the contiguous U.S., see the Gridded Normals tab for more information.Ī strong zonal pattern in the western two-thirds of the northern U.S. Many other important economic decisions that are made beyond the predictive range of standard weather forecasts are either based on or influenced by climate normals. These data allow travelers to pack the right clothes, farmers to plant the best crop varieties, and utilities to plan for seasonal energy usage. Climate Normals are the latest in a series of decadal normals first produced in the 1950s. They were first released in May 2021 (v1.0.0), and the statistics for 23 of the sites were reissued in 2023 (v1.0.1). normals every 10 years in keeping with the needs of our user community and the requirements of the World Meteorological Organization (WMO) and National Weather Service (NWS). The official normals are calculated for a uniform 30 year period, and consist of annual/seasonal, monthly, daily, and hourly averages and statistics of temperature, precipitation, and other climatological variables from almost 15,000 U.S. Normals act both as a ruler to compare today’s weather and tomorrow’s forecast, and as a predictor of conditions in the near future. Climate Normals are a large suite of data products that provide information about typical climate conditions for thousands of locations across the United States. “All this is very ominous, given the string of below-normal rain years in the past decade, the immense drought footprint in the West and last year’s off-the-charts fire season,” Patzert said.The U.S. This has serious implications for what is now a year-round fire season. Less than an inch normally falls in April, and only about a quarter-inch typically falls in May. Opportunities for precipitation fall off rapidly after that. But if March is a docile lamb instead of a roaring lion, Los Angeles finds itself in a deep, dry rainfall hole. In L.A., after February and January, March is the third-wettest month, when 2.43 inches of rain would ordinarily fall. Las Vegas has received only a quarter of an inch of rain (12% of normal) this winter, and Phoenix has gotten 31% of normal. San Jose has gotten 41%, and Santa Rosa has gotten 40%. To the north, in the Bay Area, San Francisco, Oakland and Livermore have gotten 43% of normal for the season. ![]() (A trace means precipitation that was observed but was not enough to be measurable.) Imperial, with just a trace this season, has received 0% of its normal rainfall. San Diego has tallied slightly less at 44% Riverside has gotten 38% Irvine is at 37% Long Beach and Burbank stand at 36% Palmdale is at 32% and Palm Springs is at 22%. ![]() Los Angeles has received 45% of its normal rainfall to date. According to the National Weather Service, the models show essentially no chance of rain through the end of February. ![]()
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