of Past Drought
Across the Coterminous United States from a
Network of Climatically Sensitive Tree-Ring Data
Use this page to look at PDSI data for selected years. You may view instrumental drought data as well as tree-ring reconstructions. Tree-ring maps exist for 1700-1978. Instrumental maps exist for 1895-1995. There are also animations of the annual plots for these time periods.
Instrumental Animation (AVI(8.8MB)) or (Quicktime(3.0MB)
Tree-ring Animation (AVI(23.7MB)) or (Quicktime(7.6MB)
25 January 1999