Official National Weather Service observations at Chicago-area stations, including O’Hare and Midway, recorded a daily maximum of 82–83 °F on June 7, placing the reading just above the 1991–2020 climatological normal of 78 °F. Mostly sunny skies, light easterly flow, and dew points in the upper 50s supported modest daytime heating without significant cloud cover or lake-breeze suppression that often caps lakefront readings. Forecast models initialized the prior day converged on highs in the low-to-mid 80s, and no revisions or measurement discrepancies have emerged. The narrow outcome band now carries 100 % market-implied odds because any deviation would require an unreported station error or post-hoc adjustment outside historical precedent. Resolution will follow final quality-controlled data release within the next 24–48 hours.