Traders have overwhelmingly priced 19°C as the highest temperature recorded in Buenos Aires on October 13, driven by official observations from the Servicio Meteorológico Nacional confirming that daily maximum under springtime conditions in the Southern Hemisphere. Station data showed no anomalous warming from advection, subsidence, or urban heat effects that would push readings into the 20°C range, consistent with regional model consensus from the prior 48 hours. This near-certain market outcome reflects the resolution criteria tied to verified meteorological measurements rather than forecasts. The primary uncertainty now centers on any post-analysis adjustments to raw data or differences across monitoring sites, though historical patterns indicate such revisions rarely alter the reported maximum once preliminary values are released.