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Summary of Precipitation Data for the Black Hills Area of South Dakota, Water Years 1931-98

As part of the Black Hills Hydrology Study, precipitation data were summarized for the Black Hills area in South Dakota for water years 1931-98 in a recently published U.S. Geological Survey Open-File Report (OFR 00-329). Precipitation data are available for numerous gaging locations; however, few gages have continuous, long-term records, and periods of missing record are common. Thus, a geographic information system (GIS) utilizing an inverse-distance weighting method was developed to generate spatial precipitation distributions from point precipitation data for the Black Hills area, based on available monthly records. The spatial distributions were used to estimate periods of missing record for selected gaging locations. The resulting monthly records of measured and estimated precipitation were tabulated for water years 1931-98 for 94 gaging locations. Average values for water years 1961-90, which is the period used for calculation of climatic normals, also were included with the tabulated data. The 94 gaging locations include both National Oceanic and Atmospheric Administration (NOAA) gages and U.S. Geological Survey (USGS) gages. Selected site information for the gages is presented in table 1, which provides links to download the monthly precipitation data.