Trader consensus assigns a 99.6% implied probability to a lowest temperature of 10°C in Shanghai on May 1, driven by official early-morning observations from the Xujiahui Observatory—the authoritative reference station for city records—registering a minimum around 10°C under partly cloudy conditions with light southerly winds. China Meteorological Administration hourly data and short-range forecast models confirm stabilization, as daytime solar heating and warm air advection prevent further radiative cooling typical in spring nights. Historical May averages exceed 15°C, but this mild pattern aligns with recent climatological analogs. A challenge would require unexpected nocturnal downdrafts or clear skies enhancing cooling post-sunset, unforecasted in current ensemble guidance; final daily minimum report due from CMA later today.