Latest weather models from China's Meteorological Administration and international forecasts like ECMWF converge on a daytime high of 17°C in Chongqing on March 20, driving the market's 100% implied probability for this outcome amid overcast skies and light winds suppressing temperatures. Historical March data shows average highs of 16-18°C, aligning with current cool air masses from the north, verified by surface observations and satellite imagery. Trader consensus reflects low model spread, with root-mean-square errors typically under 2°C for short-range predictions. Realistic challenges include an unforeseen southerly warm front or urban heat island amplification pushing toward 19°C, though ensemble probabilities assign under 5% odds to such deviations.