**Trader consensus has coalesced at 100% implied probability on a daily high of 78–79°F for Chicago on October 13, 2026, reflecting post-event confirmation from National Weather Service observations.** Official station data, primarily from Chicago O’Hare (KORD), recorded a maximum temperature squarely in this narrow band, consistent with model guidance showing a lingering warm ridge that delivered above-normal readings before a cool-down. Historical context places this well above the 1991–2020 average high of roughly 65°F for the date, though short of the 88°F all-time record set in 1975. Minor 0.1% probabilities on adjacent or outlier bins persist due to the remote chance of final data revisions, station discrepancies between O’Hare and Midway, or measurement adjustments, but these are negligible once preliminary climatological summaries are released. No significant model disagreement or observational uncertainty remains at this stage, locking in the outcome ahead of any formal market resolution.