Western Regional Climate Center

Providing Climate Services Since 1986
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Standardized Precipitation Index (SPI) Products

What is the Standardized Precipition Index (SPI)?

SPI products for Alaska

Select the SPI product (from the left column) and the time scale (from the top row). Click the intersecting box to display the product mapped for the continental U.S. climate divisions. To obtain details for a climate division, click on the appropriate area of the displayed U.S. map.

product available, click to view     product not available

time scale in months through the end of January , 2024
  1 2 3 4 5 6 7 8 9 10 11 12 15 18 24 30 36 48 60 72
Accumulated Precip Dep. from Normal
Percentage of Average
Precipitation Percentile
Standardized Precip Index

For more drought information, visit National Drought Mitigation Center