Houston's weather on April 18 will be determined by the city's official high temperature reading for that day. Weather markets resolve based on the National Weather Service daily maximum temperature recording, making outcomes directly tied to recorded meteorological data. The current 0% YES odds suggest traders believe the high will fall outside the 70-71°F range, likely either warmer or cooler given typical spring conditions. Houston's spring weather in mid-April typically ranges from low 70s to mid-80s Fahrenheit, so this narrow two-degree window represents a specific and fairly constrained meteorological outcome. The market closes at midnight UTC on April 18, finalizing around the official NWS high temperature report for the day. Daily weather markets like this one allow traders to speculate on precise temperature bands, with resolution determined directly by historical weather data from recognized meteorological authorities. The current market pricing at 0% YES indicates minimal probability assigned to this narrow window, reflecting either market expectations of temperatures elsewhere in the range or concentrated bearish positioning.