Current forecast models indicate moderate uncertainty in Denver's overnight low for August 22, with ensemble guidance showing potential for enhanced radiational cooling under clear, dry conditions versus limited warming from weak warm-air advection. Denver's 5,280-foot elevation and low humidity amplify the diurnal range, enabling surface temperatures to drop efficiently after sunset when skies remain clear and winds stay light. Historical August normals place the typical minimum near 55–57°F, yet recent model runs have trended slightly cooler, supporting the market's elevated implied probability for readings at or below 51°F. Updated National Weather Service guidance and new model cycles tonight will likely refine these probabilities ahead of the 24-hour observation window.