Korea Meteorological Administration (KMA) observations at Seoul's official weather station confirm the daily minimum temperature on May 15 reached exactly 15°C during early morning hours, propelling trader consensus to a 100% implied probability for that outcome as diurnal warming under clear skies and light easterly winds prevented further drops. This aligns with mid-May climatological norms, where Seoul's average lows fall between 13°C and 16°C based on decades of KMA records, amid a high-pressure ridge fostering stable conditions. While final KMA daily summaries could theoretically revise automated readings with manual quality checks—such as if overlooked pre-dawn data emerges—such adjustments are exceedingly rare once the full 24-hour period elapses. Traders await the official report for resolution.