Highest temperature in Chicago on May 31?

Highest temperature in Chicago on May 31? is a weather prediction market asking traders to forecast the highest temperature recorded at Chicago O'Hare Intl Airport Station on 31 May 2026. The event resolves using Wunderground daily history data for KORD, with the final outcome based on the temperature range that contains the day’s maximum reading in whole degrees Fahrenheit. Because the market can only resolve after the first data point for the following day is published, the relevant deadline is tied to the end of May 31 and the release of June 1 observations. This forecast matters for weather-focused event prediction because it turns a specific local temperature reading into a tradable probability signal, reflecting market sentiment on Chicago weather conditions. The current market probability is about 20%, indicating traders see this outcome as possible but not the leading expectation. As a recurring weather market, it is closely watched by participants tracking daily temperature, odds, and short-horizon weather forecasts in Chicago.