Official observations from Argentine meteorological stations, including data aligned with Servicio Meteorológico Nacional monitoring, recorded a minimum temperature of 7°C in Buenos Aires on September 10, consistent with ensemble forecast models showing limited overnight cooling under partly cloudy skies and easterly flow. This outcome matched the dominant model consensus and climatological expectations for early spring, where typical minima hover near 8–12°C, producing the overwhelming 99.7% market-implied probability. Realistic challenges remain limited but include potential post-event data revisions from the primary reporting station or discrepancies in microclimate measurements across the metropolitan area.