Northern Hemisphere NCEP Reanalysis Oct-Mar El Nino vs La Nina Comparisons.
Note: Analysis software and data from Climate Diagnostics Center. Thanks to them!!
October thru March Composites
La Nina Composite Years, Based on June-November Southern Oscillation Index Selection Criteria. SOI at least +0.50, and included 1996-97 (SOI = +0.47) to improve sample size:
1964-65, 1970-71, 1971-72, 1973-74, 1974-75, 1975-76, 1988-89, 1996-97
El Nino Composite Years, Based on June-November Southern Oscillation Index Selection Criteria. SOI below -0.50 :
1965-66, 1972-73, 1977-78, 1982-83, 1987-88, 1991-92, 1992-93, 1993-94, 1994-95, 1997-98
Difference (La Nina minus El Nino) Composites based on approximately equal number of years selected from above years, and shown on graphs.
Western Regional Climate Center, Dr. Kelly Redmond, email@example.com