The market for Hong Kong’s lowest temperature on May 16 reflects overwhelming trader consensus on a 23°C minimum, backed by confirmed observations from the Hong Kong Observatory showing nocturnal cooling stabilized at this level under typical May subtropical high-pressure conditions. Regional atmospheric patterns limited stronger radiative cooling, consistent with climatological baselines for the period that place average daily lows near 22–24°C. Model guidance issued in the preceding days aligned closely with these readings, leaving little room for variance in final verification. Revised station data or post-event quality checks remain the only realistic paths that could alter the outcome, though such revisions occur infrequently once official records are released.