Trader consensus heavily favors 13°C (34.5%) and 14°C (28.5%) as London's highest temperature on March 22, driven by the latest Met Office and ECMWF ensemble forecasts projecting daytime highs in this narrow band amid a mild Atlantic airflow. These models account for partial cloud cover from a weakening frontal system, limiting solar insolation and capping peaks just below seasonal norms of 11-12°C, while urban heat island effects in central London could nudge readings up by 1°C. Differentiating factors include subtle variations in timing of maximum temperature—mid-afternoon under clearer skies favors 14°C—versus increased low cloud from northerly shear boosting 13°C odds. GFS runs show slight divergence, with 40% of members at 13°C, but traders await 12Z updates for resolution clarity.