Traders assign the highest implied probabilities to minimum temperatures of 22–24°C in Shanghai on June 16 because ensemble forecasts from major models indicate persistent cloud cover and humidity associated with the East Asian monsoon and Meiyu front, which limit nocturnal radiative cooling. Recent observational data show overnight lows holding in the 21–23°C range amid overcast skies and light southerly flow, consistent with climatological norms for mid-June when average minima hover near 22°C. Differentiation among these closely matched outcomes hinges on subtle variations in forecast timing of any brief clearing or moisture advection that could shift the daily minimum by 1–2°C. Updated model runs and official guidance from agencies like the China Meteorological Administration over the next 48 hours will likely refine these probabilities ahead of market resolution.