| SOUTHERN OSCILLATION | OLR INDEX | EQUATORIAL ZONAL WIND INDEX | Summer Asian Monsoon OLR Index |
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|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| MONTH | SOI | DARWIN | TAHITI | OLR-PH | OLR-MC | OLR-DL | U200-IN | U200-CP | U850-WP | U850-CP | U850-EP | Activity | N-shift | W-shift |
| Apr 2025 | 0.5 | -0.9 | -0.1 | -0.2 | 1.7 | -0.3 | -1.0 | -0.1 | -0.7 | -0.5 | 0.4 | /// | /// | /// |
| May 2025 | 0.7 | -0.2 | 0.5 | -0.1 | 0.8 | -0.1 | -1.4 | 0.0 | -1.1 | -2.0 | -0.8 | 0.9 | 0.7 | 1.7 |
| Jun 2025 | 0.7 | 0.5 | 1.1 | 1.1 | 1.4 | -0.4 | -1.5 | 0.4 | -0.3 | -0.6 | 0.2 | 1.2 | 0.4 | -0.8 |
| Jul 2025 | 0.9 | -0.9 | 0.1 | 1.6 | 0.4 | 0.0 | -1.7 | 0.6 | -1.2 | -2.2 | -1.2 | 0.5 | 2.0 | -1.6 |
| Aug 2025 | 0.6 | 0.0 | 0.8 | 0.2 | 2.3 | -1.2 | -1.2 | 0.1 | -1.0 | -1.4 | 0.0 | 0.1 | -0.8 | -1.0 |
| Sep 2025 | 0.0 | 0.3 | 0.2 | 1.0 | 0.8 | -1.0 | -1.6 | 0.3 | -0.8 | -0.7 | -0.4 | 1.1 | 0.9 | 0.4 |
| Oct 2025 | 1.2 | -0.6 | 1.5 | 0.3 | 0.5 | -0.8 | -1.3 | 0.8 | -1.2 | -1.0 | 0.1 | 0.4 | 0.8 | 0.1 |
| Nov 2025 | 1.3 | -1.2 | 0.5 | 1.2 | 1.1 | -0.5 | -0.4 | 1.8 | -0.7 | -1.5 | -1.0 | /// | /// | /// |
| Dec 2025 | -0.2 | -0.4 | -0.8 | 0.6 | 0.8 | -0.9 | 0.9 | 0.5 | -0.6 | -0.5 | -0.9 | /// | /// | /// |
| Jan 2026 | 0.9 | -0.9 | 1.1 | 1.1 | 0.1 | -0.3 | -0.5 | 1.0 | 0.4 | -0.8 | -0.5 | /// | /// | /// |
| Feb 2026 | 1.0 | -0.2 | 2.2 | 1.3 | 0.8 | -0.8 | -0.9 | 0.8 | -0.6 | -1.4 | 0.1 | /// | /// | /// |
| Mar 2026 | 1.0 | -2.0 | 0.0 | -0.3 | 0.4 | -0.2 | 1.6 | 1.2 | 0.7 | -0.9 | -0.9 | /// | /// | /// |
| Apr 2026 | -0.6 | 0.6 | -0.3 | -1.8 | -1.9 | -0.2 | 0.2 | 0.4 | 0.8 | 0.1 | 0.0 | /// | /// | /// |
| DEFINITION, LOCATION, AREA |
TAHITI - DARWIN |
12.5ºS 131ºE |
17.5ºS 150ºW |
20-10ºN 110-140ºE |
5ºN-5ºS 110-135ºE |
5ºN-5ºS 170ºE-170ºW |
5ºN-5ºS 80-100ºE |
5ºN-5ºS 180-125ºW |
5ºN-5ºS 160ºE-175ºW |
5ºN-5ºS 170ºW-135ºW |
5ºN-5ºS 130-100ºW |
SAMOI (A) | SAMOI (N) | SAMOI (W) |
| SEA SURFACE TEMPERATURE and ANOMALY(ºC) | ||||||||||||||
| MONTH | IOBW | NINO.WEST | NINO.4 | NINO.3 | NINO.1+2 | |||||||||
| Apr 2025 | 29.64 | 0.40 | 29.64 | 0.66 | 28.5 | -0.2 | 27.7 | 0.1 | 26.6 | 0.9 | ||||
| May 2025 | 29.45 | 0.42 | 29.87 | 0.40 | 28.8 | -0.2 | 26.9 | -0.3 | 24.7 | 0.2 | ||||
| Jun 2025 | 28.40 | 0.25 | 30.21 | 0.54 | 29.1 | 0.1 | 26.4 | -0.2 | 23.5 | 0.3 | ||||
| Jul 2025 | 27.67 | 0.30 | 30.10 | 0.55 | 28.8 | -0.2 | 25.8 | 0.0 | 22.1 | 0.2 | ||||
| Aug 2025 | 27.26 | 0.23 | 30.33 | 0.89 | 28.7 | -0.1 | 24.9 | -0.2 | 21.1 | 0.3 | ||||
| Sep 2025 | 27.44 | 0.24 | 30.34 | 0.77 | 28.5 | -0.3 | 24.4 | -0.5 | 20.3 | -0.3 | ||||
| Oct 2025 | 27.86 | 0.18 | 30.25 | 0.61 | 28.3 | -0.5 | 24.5 | -0.5 | 20.9 | -0.1 | ||||
| Nov 2025 | 28.16 | 0.17 | 29.91 | 0.37 | 28.1 | -0.7 | 24.5 | -0.6 | 21.3 | -0.4 | ||||
| Dec 2025 | 28.20 | 0.19 | 29.81 | 0.64 | 28.3 | -0.3 | 24.5 | -0.7 | 22.5 | -0.4 | ||||
| Jan 2026 | 28.05 | 0.11 | 29.65 | 1.00 | 28.3 | 0.0 | 25.2 | -0.5 | 24.6 | 0.0 | ||||
| Feb 2026 | 28.35 | 0.19 | 29.30 | 0.88 | 28.3 | 0.1 | 26.5 | 0.1 | 27.3 | 1.1 | ||||
| Mar 2026 | 29.07 | 0.34 | 29.17 | 0.62 | 28.7 | 0.4 | 27.5 | 0.3 | 27.9 | 1.2 | ||||
| Apr 2026 | 29.61 | 0.37 | 29.27 | 0.29 | 29.5 | 0.8 | 28.3 | 0.7 | 27.2 | 1.5 | ||||
| DEFINITON, LOCATION, AREA |
20ºN-20ºS 40-100ºE |
15ºN-EQ 130-150ºE |
5ºN-5ºS 160ºE-150ºW |
5ºN-5ºS 150-90ºW |
EQ-10ºS 90-80ºW |
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