Standardized Precipitation Index

What is the Standardized Precipition Index? (SPI)

Select the SPI product (from the left column) and the time scale heading (from the top row.) Click on the intersecting box to display the product mapped for the U.S. Climate divisions. To obtain details for a climate division click on the desired climate division for any one of the U.S. maps.
NOTE: The following links were designed for a 1024x768 display. Other display settings may require horizontal scrolling.
Time Scale in Months Through the End of August 2020
1 2 3 4 5 6 7 8 9 10 11 12 15 18 24 30 36 48 60 72
Accumulated Precipitation
Accum. Pcpn. dep. from Normal
Percentage of Average
Precipitation Percentile
Standardized Pcpn. Index

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For more drought information: National Drought Mitigation Center
Western Regional Climate Center,