Official National Weather Service observations for September 19, 2026, recorded a daily maximum of 69°F at Central Park with nearby Newark reaching 71°F, aligning precisely with the market's near-certain 70-71°F outcome. This positioning reflects trader reliance on verified station data rather than forecasts, consistent with typical early-fall conditions under a stable high-pressure pattern that limited afternoon heating. Historical September averages for NYC hover near 75°F, making the cooler reading a modest departure driven by cloud cover and marine influence. Resolution hinges on the specific official NYC thermometer reading, so minor station discrepancies or reporting adjustments remain the only realistic variables that could shift final settlement.