Perka: Wind, Snow, Seismic and Rain Data by U.S. County

Return to Perka Library Wind, Snow, Seismic and Rain Data by U.S. County In this section, climatological data are tabulated by county. The methods used to determine each of the values are given below. Using a single point to represent an entire county may produce substantial errors for counties with large areas or closely spaced load contours. For example, in Alaska the large political divisions are not conducive to assigning a single value. The values given should only be used as a relative guide and the map should be referred to for the appropriate design parameters. Snow loads in some areas should be used with caution since local conditions may be more severe than indicated here. Also, some regions have very closely spaced contours that could introduce errors. Download the data.