Traders assign roughly even odds across the 43°F-and-below through 50-51°F buckets because official National Weather Service forecasts and ensemble models show Denver’s daily minimum hovering near the boundary between these ranges. A weak cold front and clear skies overnight are expected to promote radiational cooling, yet variable wind speeds and dew-point spreads introduce enough uncertainty that small forecast adjustments could shift the outcome by several degrees. Historical October climatology places the average low near 38°F, but this year’s warmer baseline and limited model consensus on cloud cover keep probabilities tightly clustered. Updated observations and the next model cycle tonight will likely refine the final reading before market resolution.