We recently completed a project for the Structural Engineers Association of Colorado (SEAC) to create a map of the average snow load across the state of Colorado. They provided an Excel spreadsheet of 400 sample locations each with the latitude and longitude and average snow load (pounds per square foot). We plotted this data and then interpolated the points into a surface from which we could create contour lines. The map was printed at 24″ x 36″ and we were very pleased with the results.
If you would like more information about obtaining a copy of the map, please contact SEAC directly.