1. A method of determining environmental data along a trajectory of an aircraft: at least one of collecting, deriving, or fusing environmental data from a plurality of weather sources using at least one processor; filtering, extrapolating, and fusing the environmental data, using the at least one processor, within at least one selected volume of airspace over a trajectory of the aircraft based on selected weather-applicability time intervals and on at least one of user-selected parameters comprising user-inputted smoothing parameters or weighted environmental data criteria comprising a type of each of the weather sources, wherein the trajectory comprises at least one of a planned trajectory, a current trajectory, or an intent trajectory of the aircraft; and determining an effect of the filtered, extrapolated, and fused environmental data on the trajectory, using the at least one processor, by calculating forces on the aircraft over the trajectory and flight times of the aircraft based on the filtered, extrapolated, and fused environmental data.