Monitoring Drought

The Standardized Precipitation Index

May 2001 SPI Maps

click on images for full-size maps
Interpretation of 1-month SPI
Interpretation of 3-month SPI
Interpretation of 6-month SPI
Interpretation of 9-month SPI
Interpretation of 12-month SPI
Year-to-date SPI

 

 

 

© 2005 National Drought Mitigation Center

 
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