The market's near-certain positioning on 22°C as Milan's highest temperature for May 16 reflects verified observations from official meteorological stations across the city and surrounding Po Valley. These readings captured peak daytime values under stable high-pressure conditions typical for mid-May, with limited daytime heating and no significant warm-air advection from the south. Ensemble forecasts issued in the preceding 48 hours by the European Centre for Medium-Range Weather Forecasts showed tight clustering around this range, consistent with historical climatological averages for the period. Any revision would require updated official station data or unrecognized urban heat-island effects, though neither appears in current monitoring reports.