Attributes for NHDPlus Catchments (Version 1.1) for the Conterminous United States: 30-Year Average Annual Precipitation, 1971-2000
This data set represents the 30-year (1971-2000) average annual precipitation in millimeters 
multiplied by 100 compiled for every catchment of NHDPlus for the conterminous United States. 
The source data were the "United States Average Monthly or Annual Precipitation, 1971 - 2000" 
raster dataset produced by the …