Chicago's weather prediction market tracks the highest temperature forecast for April 20, 2026. This narrow range of 68-69°F represents mild spring conditions, typical for late April in Illinois. Understanding narrow temperature windows is useful for weather-sensitive traders and forecasting enthusiasts. The market resolves at 00:00 UTC on April 21 based on the National Weather Service's officially recorded high temperature for Chicago on April 20. Currently trading at 0% odds, the market reflects trader consensus that temperatures are unlikely to fall within this specific narrow band. This could indicate market forecasts pointing either significantly warmer or cooler than the 68-69°F range. The 0% price doesn't necessarily mean the event is impossible—Chicago weather can be unpredictable—but rather that current market participants assess low probability based on available meteorological data and recent price history. With $11,961 in liquidity and $840 in 24-hour volume, the market offers reasonable trading depth for weather prediction participants. The tight resolution window (single-day expiration on April 20) means this market provides a short-duration prediction trade focused purely on Chicago's temperature accuracy. Resolution depends entirely on official NWS station data, making outcomes completely objective, verifiable, and transparent.