Tokyo experiences mild spring weather in mid-April, with average daily highs typically ranging from 18°C to 22°C. A maximum temperature of exactly 15°C would be notably cool for late April, falling below normal seasonal averages and suggesting an unusually cold weather pattern. This prediction market tracks whether Tokyo's highest temperature on April 20, 2026, will precisely reach 15°C. The current market price reflects zero percent implied probability, indicating traders collectively assess a very low probability of this outcome occurring. Temperature measurements are published daily by the Japan Meteorological Corporation, which provides the official reference for market resolution. The flat odds suggest recent weather forecasts point toward temperatures warmer than 15°C, or market participants view hitting an exact narrow temperature point as highly unlikely given natural weather variability. Daily weather markets like this one typically see higher trading activity during seasonal transitions when temperature swings are more dramatic.