The long and short of this research is trying to find roads that lie within geographic areas that fit a given climatic profile. In this case, I need to find areas within the United States with relatively cold falls, winters, and springs that get snow. These places may not have a lot of snowfall on an annual basis, but the snow persists for longer periods due to the colder weather patterns.
Are there any websites that already collect similar data in a format ready for GIS analysis? If not, what should I look for when gathering data? There may not be a singly perfect answer for this question, but I mostly am seeking direction to refine my search appropriately.