![]() Our most recent rain year, 2019-2020, is an excellent example. As I scan down the monthly precipitation totals in Los Angeles' 143 year weather record, it seems the pattern of rainfall is different for every one. To say Los Angeles recorded a normal amount of rainfall during a rain year is not the same as saying the rain year was typical. Data is calculated using code from the Global Synoptic Dynamic Model page of the PSD Map Room Climate Products. global relative atmospheric angular momentum tendency anomaly for the period November 1 to March 31 of the following year. GWO Phase Space Plot: Plot of global relative atmospheric angular momentum anomaly vs. See Precipitation>Quantity>Monthly Precipitation Listings>Monthly Totals. Reference WRCC LOS ANGELES DWTN USC CAMPUS, CA. Rain: The July-June rainfall year precipitation total in inches for Downtown Los Angeles (USC). Peak ONI Season: The peak tri-monthly season(s) for which the ONI is computed. Reference Climate Prediction Center Cold & Warm Episodes by Season ( Multiple centered 30-year base periods.) Peak ONI: The peak Oceanic Niño Index (ONI) based on SST anomalies in the Niño 3.4 region. ![]() Peak MEI Season: The peak bi-monthly season(s) for which the MEI is computed. MEI v1 values were last updated in March 2018. Peak MEI:The peak seasonal value of the Multivariate ENSO Index (MEI). GWO phase space data is calculated using code from the Global Synoptic Dynamic Model page of the PSD Map Room Climate Products. Nov-Mar AAM: The mean of the global relative atmospheric angular momentum anomaly for the period November 1 to March 31 of the following year. Version: The most recent ERSST version for which the episode was designated a cold episode. AAM and AAM tendency anomaly data not available.Ĥ. More information about Southern California weather and climate can be found using our WEATHER LINKS page.ġ. In the past decade, rainfall totals for Los Angeles have been less in the second year of successive cold episodes, but this pattern doesn't hold up over the entire record. The highest amount was 20.20 inches in 2010-11 and the lowest 4.68 inches in 2017-18. The average rain year precipitation for the 24 ERSST.v5 ONI-based Cold Episodes since 1949 is 11.84 inches. Los Angeles rainfall during La Ninas has been variable, but skewed to the drier side. The EL NIÑO/SOUTHERN OSCILLATION (ENSO) DIAGNOSTIC DISCUSSION issued Augprojects a 70% chance of La Nina conditions being present during November-January. ![]() The Oceanic Nino Index (ONI) decreased to a minimum of -1.3 in the Oct-Nov-Dec season. La Nina conditions developed in August 2020 and transitioned to ENSO-neutral in April 2021. ![]() Climate Normals and Normals Calculation Methodology 2020 (PDF). Interim 2006-2020 climate data is shockingly dry, with normal rainfall in Los Angeles calculated at only 11.39 inches! For more info see U.S. Analysis of 1991-2020 data provided the new normal of 14.25 inches. The normal rainfall for Los Angeles was 15.14 inches based on 1971-2000 climate data, and dropped to 14.93 inches based on data from1981-2010. The amount of rainfall that is considered "normal" for Downtown Los Angeles has decreased nearly an inch in the past three decades. Much of the West recorded below average precipitation for the rain year. This is about 41% of the new normal annual precipitation total of 14.25 inches. WRCC/HPRCC Percent of Normal Precipitationĭowntown Los Angeles (USC) ended the 2020-21 rain year (July 1 to June 30) with 5.82 inches of rain. ![]()
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