If the highest temperature recorded at Chicago Midway, IL for September 19, 2025, is greater than 89° according to the National Weather Service's Climatological Report (Daily), then the market resolves to Yes.

Not all weather data is the same. While checking a source like AccuWeather or Google Weather may help guide your decision, the official and final value used to determine this market is the highest temperature as reported by the corresponding NWS Climatological Report (Daily) linked in the rules above. Preliminary NWS reporting and measurement methods may be subject to underlying rounding and conversion nuances. Traders should exercise caution when interpreting preliminary NWS data.

Series KXHIGHCHI-25SEP19 Event KXHIGHCHI-25SEP19 Market KXHIGHCHI-25SEP19-T89