May 2024

Southern Oscillation Index (SOI)

  • The 30-day Southern Oscillation Index (SOI) for the 30 days to 26 May 2024 was +1.4. The 90-day SOI value was -1.2.
  • Sustained negative values of the SOI below −7 typically indicate El Niño while sustained positive values above +7 typically indicate La Niña.
Latest 30-day moving SOI
Sourced from the Australian Bureau of Meteorology
Image for Southern Oscillation Index