Latest National Weather Service and ensemble model forecasts, including GFS and ECMWF, project Chicago O'Hare highs around 50-55°F on April 6, driving trader consensus toward the closely matched 50-51°F (26.5% implied probability) and 52-53°F (24%) outcomes, with a notable 25% for 60°F or higher reflecting ridge amplification potential. This uncertainty stems from a recent cold front following late-March record 80°F heat, which plunged early April temperatures below climatological normals of 55°F, introducing variable spring patterns influenced by Great Lakes moderation and upper-level trough evolution. Key differentiators include frontal timing and wind regimes—northerly flows favor cooler 40s, while southerly returns enable warmer spikes. Traders await daily 00Z/12Z model runs and NWS updates for resolution clarity by week's end.