Data sources for indices:
ERSST.V5 : Huang, B., Peter W. Thorne, et. al, 2017: Extended Reconstructed Sea Surface Temperature version 5 (ERSSTv5), Upgrades, validations, and intercomparisons. J. Climate
Climatology : 1991-2020

WTIO  : SSTA averaged in [50ºE-70ºE, 10ºS-10ºN]
SETIO : SSTA averaged in [90ºE-110ºE, 10ºS-0]
DMI  = WTIO - SETIO

  Year   Month     WTIO      SETIO       DMI
  2024     6       0.59       0.68      -0.09
  2024     7       0.57       0.92      -0.35
  2024     8       0.66       0.40       0.26
  2024     9       0.61       0.49       0.11
  2024    10       0.44       0.80      -0.36
  2024    11       0.41       0.91      -0.49
  2024    12      -0.07       0.43      -0.50
  2025     1      -0.18       0.22      -0.39
  2025     2       0.05       0.05       0.00
  2025     3       0.24      -0.01       0.25