Trader consensus on Polymarket, with 34.5% implied probability for 78-79°F as the highest temperature at LaGuardia Airport (KLGA) on April 17, reflects the latest National Weather Service (NWS) guidance and ensemble model outputs from NOAA's GFS and ECMWF, which project a daytime high in that range amid southwesterly winds advecting warm air from the south. Current unseasonably warm conditions—mid-80s°F observed at nearby stations on April 16—support elevated temperatures well above the April climatological average of 60°F, but uncertainty stems from divergent model runs: clearer skies could push 80-83°F (44.5% combined probability) via enhanced solar insolation and boundary layer mixing, while isolated afternoon showers or thunderstorms (noted in recent NWS discussions) might suppress peaks to 77°F or below (22%). Watch for NWS forecast updates this evening and tomorrow morning, as proximity to resolution heightens sensitivity to refined short-range guidance.