Official observations from National Weather Service stations, including Central Park, recorded a maximum of 85–87°F on August 19, 2026, under building high pressure, southerly flow, and mostly sunny skies that limited cloud cover and allowed efficient daytime heating. Ensemble model guidance and point forecasts had centered near this range days earlier, aligning trader consensus with the measured outcome and producing the 100% market weighting on the 86-87°F bin. Historical August averages near 83–84°F provide context, while realistic challenges to this resolution remain limited to post-event data revisions or station-specific discrepancies, both rare once preliminary climate summaries are issued.