One row per strong El Nino since 1982 (1982-83, 1987-88, 1991-92, 1997-98, 2009-10, 2015-16, 2023-24) with its peak ONI and RONI read from the NOAA CPC series, and a highlighted "so far" row for 2026-27.
Koh Samui watch
The table lists the El Ninos that NOAA's ONI table classes as strong or very strong since 1950, plus 1987-88 (listed as strong in older tables; the current ONI peaks at +1.49 °C, just under the band, and the page says so in a note).
Columns:
Peak ONI / Peak RONI: the highest 3-month value between spring of the developing year and early summer of the next, with its season code (NDJ 1997 = November-December-January centred on December 1997). Both are read from the NOAA CPC files the app already collects (ONI (Oceanic Nino Index), RONI (Relative Oceanic Nino Index)); nothing is typed in by hand.
Strength: the NOAA band of the peak ONI.
ONI at JJA: the value at the same stage the current event has reached (June-July-August of the developing year), for a like-for-like comparison.
Impacts: how many documented reports the page holds for that event (see Documented impacts timeline).
The 2026-27 so far row (highlighted) shows the current event's latest ONI, RONI and weekly Nino 3.4 with their dates, and the rain of the season under way. Its Samui columns fill in only when the months are complete: a blank means "not yet", never "nothing happened".
How to read it
Compare like with like: the "ONI at JJA" column is the fair comparison with 2026 (ONI +1.80 °C in JJA 2026 was above all seven analogs at that stage). The peak column says how big each event became by the winter, which 2026-27 has not reached yet.
Why it matters for Koh Samui
It tells the owners which past dry seasons are the closest precedents for 2027, and how unusual the current event already is.