Traders have converged on 22°C as the highest temperature recorded in Milan on May 16, 2026, because official observations from the Italian Meteorological Service confirmed a daytime maximum of exactly that value under stable high-pressure conditions. Climatological norms for mid-May in the Po Valley place average highs between 21°C and 23°C, and model consensus from regional forecasts aligned closely with this range, showing minimal diurnal variability and no significant warming advection. The market-implied odds reflect this data-driven certainty, with real capital positions now fully resolved at the observed threshold. Only an anomalous sensor discrepancy or post-hoc revision in the official record could alter the outcome, though such adjustments are historically rare for Milan’s primary stations.