If the maximum temperature recorded at Chicago (CLIMDW) for Oct 15, 2026, is between 63-64° fahrenheit according to The Weather Company, then the market resolves to Yes. Outcome verified from The Weather Company.

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 maximum/minimum temperature as reported by the Weather Company.

Reading weather data Preliminary Weather Company data may be subject to rounding and conversion differences from the final reported value. Use caution when interpreting preliminary Weather Company readings.

If it is determined in the sole discretion of the Exchange that there is a material error in the initial non-preliminary publication, Expiration may be held until the publication of a non-materially-erroneous data revision or until the Expiration Date, whichever comes first. If no data is available at the end of this period, all markets will resolve to the last fair price determined by Kalshi. Please note, a status of "Final" on weather.com/kalshi is provided for convenience only, and does not guarantee data to be error-free and thus exempt from the above.

Note: this event is mutually exclusive.