National Weather Service forecast models indicate a strong cold front will push into the Denver area by May 19, driving daytime highs into the mid-40s Fahrenheit under mostly cloudy skies with light northerly winds. This represents a sharp departure from the seasonal normal of 73°F, supported by consistent runs from the Global Forecast System and European Centre for Medium-Range Weather Forecasts showing advection of cooler Canadian air behind the front. Trader consensus has priced the 55°F-or-below outcome above 97 percent, reflecting high model agreement on limited mixing and persistent cloud cover that caps warming. A faster-than-expected frontal passage or unexpected downslope warming could lift temperatures a few degrees, though current guidance shows low probability of such shifts before the market resolves.