Monitoring Drought

The Standardized Precipitation Index

1999 SPI Maps through December

click on images for full-size maps
1-month SPI through December 1999 3-month SPI through December 1999
Interpretation of 1-month SPI
Interpretation of 3-month SPI
6-month SPI through December 9-month SPI through December
Interpretation of 6-month SPI
Interpretation of 9-month SPI
12-month SPI through December 1999 Year-to-date SPI through December 1999
Interpretation of 12-month SPI
Year-to-date SPI

 

 

 

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