Mexico City's weather follows predictable patterns due to its tropical highland climate at 2,250 meters elevation in central Mexico. Daily high temperatures typically range between 20-28°C during this season, with April being part of the warm dry season before the May rainy season begins. A high of exactly 17°C would represent a significant cooling event, approximately 5-8°C below the seasonal norms typically observed in mid-April. This market resolves based on the official maximum temperature recorded by Mexico City's meteorological station for April 20, 2026. The current 0% odds reflect the extremely low probability assigned by traders, suggesting they view a 17°C high as nearly impossible under current and forecasted atmospheric conditions. Historically, Mexico City experiences very stable temperatures throughout the year due to its high elevation and tropical location. Reaching a high of only 17°C would require an unusual cold front, a strong low-pressure system, or significant atmospheric disruption from tropical systems. This daily temperature market closes at midnight UTC on April 20, with resolution data sourced from Mexico's official meteorological authority and public weather station records.