Hong Kong Observatory's official measurements at King's Park—the authoritative reference station for daily minimum air temperatures—recorded 22°C as the lowest reading on May 3, solidifying trader consensus at 100% implied probability for that outcome amid real-money positioning. Evening observations showed temperatures cooling to 22°C under partly cloudy conditions with isolated showers, aligning with typical May diurnal cycles where minima average 23–24°C but can dip lower during radiative cooling nights. Climatological data supports this as plausible for early May, with no significant cold air advection. Realistic challenges are minimal post-event, limited to rare station data audits revealing overlooked lower readings from automated weather stations, though resolution criteria prioritize King's Park verified data.