A method for determining wind conditions within a geographic area based on a plurality of input wind resource grids. The input wind resource grids include input points associated with a geographic position and a wind condition. An output wind resource grid having a plurality of output points is defined. Each output point is associated with a geographic position within the geographic area. For each output point in the output wind resource grid, a wind condition is calculated based at least in part on wind conditions associated with at least some of the input points. A wind condition associated with an input point may be weighted based on the proximity of the output point to a meteorological instrument associated with the input point.