Official observations from National Weather Service stations in the New York City area, including Central Park, recorded a daily maximum of 72°F on September 15, 2026, under clear skies with light southerly winds and no significant cloud cover or precipitation to moderate temperatures. This value aligned precisely with the market's dominant outcome, as post-event data releases from the NWS eliminated remaining uncertainty around nearby bins. The reading fell several degrees below the 1991–2020 climatological average high of 76.7°F for the date, consistent with a transient cool air mass and northeasterly flow earlier in the period. While final quality-controlled datasets are rarely revised, an undetected station malfunction or late data correction could theoretically shift the result, though historical precedent shows such changes are exceedingly rare for temperature maxima.