Beijing's weather patterns in mid-April are transitional, marking the shift from spring to early summer. April 18 represents a typical spring day when daytime temperatures in Beijing can range from 18°C to 28°C depending on air masses and atmospheric conditions. A high of exactly 26°C falls within the normal range for this time of year, neither particularly warm nor cool for Beijing in late April. The current 15% odds suggest the market expects the maximum temperature to diverge significantly from 26°C—either cooler due to lingering cool air masses or warmer as summer approaches. Historical April data for Beijing shows considerable daily variability, with highs ranging across a 10-15 degree span within the same week. Resolution is straightforward: official weather services report Beijing's daily high temperature, and the market resolves YES if that high equals exactly 26°C on April 18 at 00:00 UTC. The specificity of the temperature target reflects why odds are modest—precise temperature prediction is inherently difficult. Recent trading activity indicates active participation in daily temperature markets, a recurring feature for this category.