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1. Monthly drought index for the conterminous United States: 6-month and 36-month Standardized Precipitation Evapotranspiration Index (SPEI) for 10 climate scenarios, 1950-2070 Data publication contains GIS data

Author(s):
Costanza, Jennifer K.; Koch, Frank H.; Reeves, Matthew C.

2. Monthly drought index for the conterminous United States: 6-month and 36-month Standardized Precipitation Evapotranspiration Index (SPEI) for observed climate data, 1950-2018 Data publication contains GIS data

Author(s):
Costanza, Jennifer K.; Koch, Frank H.; Reeves, Matthew C.