Tokyo in April typically experiences pleasant spring weather, with average high temperatures ranging from 15–22°C depending on specific atmospheric conditions and regional microclimates. April 20 falls in mid-to-late spring, a transition period moving toward warmer early summer conditions. The question asks whether Tokyo's highest temperature will be precisely 17°C—a highly specific outcome requiring exact measurement and hitting a narrow single-degree target. At current YES odds of 0%, the market sentiment strongly suggests this outcome is deemed extremely unlikely or near-impossible. This pricing reflects market expectations that April 20's maximum temperature will deviate significantly from 17°C, either remaining lower at 15–16°C or rising higher into the 18–25°C range. Weather prediction markets of this type are fully resolvable through official meteorological data published by Japan's Meteorological Agency, which measures and records daily maximum temperatures at designated reference stations throughout Tokyo using standardized measurement protocols. The 0% odds underscore the inherent difficulty in predicting an exact single-degree outcome in real-world weather variability and the extreme precision required to settle this specific market.