Chicago experiences highly variable weather during mid-April, with typical daily high temperatures ranging from the mid-50s to low 70s Fahrenheit. The question asks whether April 20's highest temperature will fall within a very specific 66-67°F band—a narrow constraint that naturally limits probability. With current YES odds at 0%, the market communicates that traders view this outcome as virtually impossible or extraordinarily unlikely. This pricing reflects the inherent volatility of spring weather in Chicago, where daily highs can fluctuate significantly depending on the position of weather systems and air mass patterns. The 66-67°F range represents just a small slice of plausible outcomes for any given April day. April in Chicago sits at the intersection of retreating winter systems and advancing spring conditions, creating considerable day-to-day unpredictability. Strong high-pressure systems can push temperatures toward the 70s, while lingering cold fronts can keep them in the 50s. The zero market odds suggest traders expect the daily maximum to deviate substantially from this narrow 2-degree band. The market will resolve on April 20 at midnight UTC, with the final outcome determined by the highest temperature recorded at Chicago's official National Weather Service station.