Trader consensus closely splits implied probabilities between 10°C (33%), 9°C (31%), and 11°C (21.5%) for Toronto's highest temperature on May 1 at Toronto Pearson International Airport, driven by Environment Canada's morning forecast of a 12°C daytime high under mainly cloudy skies with 30% afternoon shower chances, following overnight lows near 0°C under a yellow frost advisory. A persistent upper-level trough maintains cool northerly flow from a recent cold Canadian air mass, limiting solar insolation and capping warming well below the early-May climatological average of 14-15°C. Differentiating factors hinge on cloud thickness and shower timing—thicker overcast or heavier precip favoring 9°C, partial breaks enabling 11°C—with GFS and ECMWF ensembles showing 2-3°C spreads; real-time hourly data will sharpen resolution by evening.