National Weather Service observations from Miami International Airport (KMIA) confirm the lowest temperature on May 3, 2026, reached 72°F around early morning hours, driving trader consensus to 100% on the 72-73°F outcome as final daily climate reports solidify this measurement. Persistent southerly winds of 5-10 mph, combined with the urban heat island effect and typical early-May dewpoints near 72°F, limited radiative cooling consistent with South Florida's climatological norms (average low ~72°F). Model forecasts from prior days aligned closely, showing minimal overnight temperature drops under partly cloudy skies. While data revisions are rare post-observation, a challenge could arise only from discrepancies in official station readings or alternative resolution sources, though KMIA data carries authoritative weight for such markets.