Denver's daily high temperature on April 19 is a fully resolvable event tracked through National Weather Service records at Denver International Airport. Mid-April in Denver typically experiences highs ranging from the mid-50s to low-70s, though the specific 58-59°F band represents a relatively narrow window within that seasonal distribution. The current 0% YES odds suggest market participants believe this temperature range is unlikely on that date, reflecting broader expectations for either warmer or cooler conditions based on current atmospheric patterns and seasonal climate normals. Historical data for April 19 shows year-to-year variability, with some years seeing highs in the mid-50s while others reach the low-70s depending on continental weather systems, jet stream positioning, and spring storm activity in the region. The market becomes available approximately one week before the resolution date, allowing traders to incorporate updated weather forecasts from the National Weather Service and meteorological models. As the event date approaches, odds may shift if forecast models indicate temperatures moving into the 58-59°F range. This daily temperature market is part of a recurring series of weather prediction markets covering Denver and other major cities. Resolution is based on the official National Weather Service high temperature reading for Denver International Airport, providing transparent and independently verifiable criteria.