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 2008 |
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| Accumulated Precipitation |
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| Accum. Pcpn. dep. from Normal |
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| Percentage of Average |
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| Precipitation Percentile |
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| Standardized Pcpn. Index |
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For more drought information: National Drought Mitigation Center
Western Regional Climate Center, wrcc@dri.edu