Traders assign near-certainty to a 34°C high in Panama City on July 31 because official observations from the Instituto de Meteorología e Hidrología de Panamá (IMHPA) recorded that exact maximum under typical late-July wet-season conditions, with daytime heating tempered by afternoon convection and cloud cover. Ensemble guidance and regional climatology for the Caribbean coast of Panama support peaks in the low-to-mid 30s Celsius during this period, consistent with historical baselines around 32–34°C absent unusual clear-sky or subsidence events. The market’s 100% implied probability on 34°C reflects this verified data point rather than forecast uncertainty. A realistic challenge would require an official data revision, station-specific reanalysis, or resolution criteria that distinguish between airport versus urban sensors, though such adjustments remain uncommon for daily maxima once initial reports are issued.