Monitoring
Drought
The Standardized Precipitation Index
2002
Archive SPI Maps
click on map for a suite of SPI maps
December
November
October
September
August
July
June
May
April
March
February
January
Note: SPI maps are based on preliminary precipitation data and caution is necessary when analyzing. For a detailed look at the data source and methods used in incorporating the data into a final product, click here.
© 2006 National Drought Mitigation Center